What does NOT experience gravity?

Answers

Answer 1

Answer:

Astronauts who are orbiting the Earth often experience sensations of weightlessness. These sensations experienced by orbiting astronauts are the same sensations experienced by anyone who has been temporarily suspended above the seat on an amusement park ride. Not only are the sensations the same (for astronauts and roller coaster riders), but the causes of those sensations of weightlessness are also the same. Unfortunately however, many people have difficulty understanding the causes of weightlessness.


Related Questions

I need help, worth 40 Points!

A plane flies due north (90° from east) with a velocity of 100 km/h for 3 hours. During this time, a steady wind blows southeast at 30 km/h at an angle of 315° from due east. After 3 hours, where will the plane’s position be relative to its starting point?

*Please try to fill the data table.

I need help, worth 40 Points!A plane flies due north (90 from east) with a velocity of 100 km/h for 3
I need help, worth 40 Points!A plane flies due north (90 from east) with a velocity of 100 km/h for 3

Answers

Answer:

thank you

Explanation:

Split up the two given velocity vectors into horizontal and vertical components.

Plane:

p = (100 km/h) (cos(90°) i + sin(90°) j ) = (100 km/h) j

Its direction is given, 90° relative to east.

Traveling for 3 hours with this velocity results in a displacement of

p * (3 h) = (300 km/h) (3h) j = (900 km) j

meaning that this velocity contributes to a north-facing displacement of 900 km.

Wind:

w = (30 km/h) (cos(315°) i + sin(315°) j ) ≈ (21.2 km/h) i + (-21.2 km/h) j

Its direction is also given, 315° relative to east.

After 3 h, this velocity contributes to a displacement of

w * (3h) ≈ (63.6 km) i + (-63.6 km) j

meaning if the plane had no velocity of its own but somehow stayed in the air, the wind would have pushed it about 63.6 km south and 63.6 km east, which translates to a net displacement of

√((63.6 km)² + (-63.6 km)²) = 90 km

due southeast.

Putting everything together, your table displacement table should read:

.                       |   wind   |   plane

velocity           |   30      |   100       ...   km/h

direction         |   90°     |   315°      ...   relative to east

x                      |   63.6   |   0           ...   km

y                      |  -63.6   |   900      ...   km

The resultant vector is the sum of these, r = p + w :

r ≈ (21.2 km/h) i + (78.8 km/h) j

After 3 h, the resultant displacement is

r * (3h) ≈ (63.6 km) i + (236.4 km) j

with magnitude

√((63.6 km)² + (236.4 km)²) ≈ 244.8 km

and direction θ such that

tan(θ) ≈ (236.4 km) / (63.6 km)

θ ≈ arctan(3.714) ≈ 74.9°

So the resultant table should read

xnet             |   63.6 km

ynet             |   236.4 km

magnitude   |   244.8 km

theta            |   74.9° relative to east

A golf ball increases its momentum by 6.75 kg m/s. The impact between the ball and club lasted for 0.0025 s. How much force acted on the ball from the club?

A golf ball increases its momentum by 6.75 kg m/s. The impact between the ball and club lasted for 0.0025

Answers

The force acted on the golf ball is 2,700N.

How to calculate force?

Momentum in physics is the tendency of a body to maintain its inertial motion i.e. the product of its mass and velocity, or the vector sum of the products of its masses and velocities.

According to this question, a golf ball increases its momentum by 6.75 kgm/s. The impact between the ball and club lasted for 0.0025s.

Force is the rate at which momentum changes with respect to time i.e. (F = dp/dt).

Force = 6.75kgm/s ÷ 0.0025s

Force = 2,700N

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The function d(v) = 0.0067 v^2 + 0.15v can be used to determine the safe stopping distance, d(v), in metres for a car given its speed, v, in kilometres per house. determine the speed at which a car can be traveling in order to be able to stop at a distance of 24m. show your work and round your final answer(s) to the nearest meter.

Answers

Evaluate the function when d(v) = 24.

\(\begin{gathered} 24=0.0067v^2+0.15v \\ 0.0067v^2+0.15v-24=0 \end{gathered}\)

Use the quadratic formula to find v.

\(v=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}\)

Where a = 0.0067, b = 0.15, and c = -24.

\(\begin{gathered} v=\frac{-0.15\pm\sqrt[]{0.15^2-4\cdot0.0067\cdot(-24)}_{}}{2\cdot0.0067}=\frac{-0.15\pm\sqrt[]{0.6657}_{}}{0.0134} \\ v_1=49.7\cdot\frac{km}{hr}_{} \\ v_2=-72.1\cdot\frac{km}{hr} \end{gathered}\)

Therefore, the car should travel at 49.7 km/hr.

We take the positive speed as the answer.

Nancy and Joe were racking the leaves in their yard. Initially Joe claimed the bag of leaves was not heavy. Joe didn't notice a difference in the weight of the bag of leaves until the end when he claimed that there must be rocks in there. Joe was experience which of the following?
sensory adaptation
difference threshold
priming
transduction

Individuals with damage to their visual cortex should not be able to see objects presented to them. But when presented objects in a laboratory individuals were able to identify which cup was larger. This shows that the brain engages in which of the following?
parallel processing
feature detection
blind spot
retinal disparity

Sally is researching children's fear of heights. She utilizes a device that determines if children will continue to crawl past a visible edge. Sally is most likely using which of the following devices?
depth perception apparatus
visual cliff
MRI scans
binocular cues

Answers

Joe was experiencing sensory adaptation, while individuals with damage to their visual cortex who could still identify object sizes were engaging in parallel processing. Sally is likely using a visual cliff apparatus to study children's fear of heights.

Joe's experience of not noticing a difference in the weight of the bag of leaves until the end suggests sensory adaptation. Sensory adaptation is the phenomenon where our sensory receptors become less responsive to constant or repetitive stimuli over time. In this case, Joe initially claimed the bag of leaves was not heavy because his sensory receptors adapted to the weight. However, when he noticed a sudden change in weight, he attributed it to the presence of rocks, indicating a difference threshold.

In the second scenario, individuals with damage to their visual cortex should theoretically not be able to see objects presented to them because the visual cortex plays a crucial role in processing visual information. However, when they were able to identify which cup was larger, it indicates that the brain engages in parallel processing. Parallel processing is the ability of the brain to simultaneously process multiple aspects of a stimulus or task. In this case, even though the individuals' visual cortex was damaged, other visual processing pathways or areas in the brain were able to contribute to the identification of object sizes.

Sally's use of a device to determine if children will continue to crawl past a visible edge suggests that she is using a visual cliff apparatus. The visual cliff apparatus is a device used in psychological studies to assess depth perception in infants and young animals. It typically consists of a glass or  plexiglass surface with a visible drop-off, creating the illusion of a cliff. By observing the behavior of children when faced with the visual cliff, researchers can gain insights into their perception of heights and their fear response. The visual cliff apparatus helps to assess if children have developed depth perception and if they perceive the visible edge as a potential danger.

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A ball is thrown vertically upward with an initial velocity of 29. 4 meters per second. What is the maximum height reached by the ball? [neglect friction. ].

Answers

Answer:

44 m

Explanation:

vf = velocity at highest point = 0

vf = vo + at

0 = 29.4 + (-9.81 )t    shows   t = ~ 3 s

d = vo t + 1/2 a t^2

d = 29.4 ( 3) + 1/2 ( -9.81)(3^2 ) = 44 m

if the resulting potential difference between the two conductors is 420 v, what is the capacitance, in nanofarads, of the cable?

Answers

The  the capacitance of the cable is 18 nF, when the resulting potential difference between the two conductors is 420 V.

The capacitance of a cable is 125 nF when the resulting potential difference between the two conductors is 60 V. If the resulting potential difference between the two conductors is 420 V, what is the capacitance, in nanofarads, of the cable

Given:

Capacitance, C = 125 nF

Initial potential difference, V1 = 60 V

Final potential difference, V2 = 420 V

To find:

The capacitance of the cable is given by the formula:

Capacitance, C = (Charge, Q) / (Potential difference, V)

Or,

Charge, Q = C × V

We know that,

Charge, Q1 = C × V1

Charge, Q2 = C × V2

If we divide Q2 by Q1, then we get:

C × V2 / C × V1

= Q2 / Q1

Or,

C × V2 / C × V1 = (Final charge) / (Initial charge)

From the principle of conservation of charge, we know that:

Charge cannot be created or destroyed; it can only be transferred from one place to another.

Therefore, the initial charge and final charge are the same.

So, we can say that:

Charge, Q2 = Charge, Q1

Hence, C × V2 = C × V1

Or,

C = V1 / V2 × C1

Substituting the values, we get:

C = 60 V / 420 V × 125nF

= 18 nF (approximately)

Therefore, the capacitance of the cable is 18 nF, when the resulting potential difference between the two conductors is 420 V.

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A car has a velocity of 24 m/s. Two seconds later it reaches the bottom of the hill with a velocity of 45 m/s. What is the acceleration of the coaster?

Answers

Answer:

a = 10.5 m/s²

Explanation:

In order to find the acceleration of the car we will use the basic definition of the acceleration, that is the rate of change of velocity. So, the definition of the acceleration of the car will be:

a = (Vf - Vi)/t

where,

a = acceleration = ?

Vf = Final Velocity = 45 m/s

Vi = Initial Velocity = 24 m/s

t = time = 2 s

Therefore,

a = (45 m/s - 24 m/s)/2 s

a = 10.5 m/s²

T/F The sign of momentum is always in the direction of travel

Answers

The given statement is true .

The sign of momentum is indeed always in the direction of travel.
Momentum is defined as the product of an object's mass and its velocity. Mathematically, it can be expressed as:
Momentum (p) = mass (m) × velocity (v)

Since velocity is a vector quantity that has both magnitude and direction, the sign of momentum will also depend on the direction of the object's motion. If an object is moving in a positive direction (e.g., to the right or upward), its momentum will have a positive sign. Conversely, if an object is moving in a negative direction (e.g., to the left or downward), its momentum will have a negative sign.

In summary, the sign of momentum is always in the direction of travel because it is directly influenced by the object's velocity, which is a vector quantity with both magnitude and direction.

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What volume of 2. 00 M HCl in liters is needed to react completely (with nothing left over) with 0. 500 L of 0. 500 M Na2CO3

Answers

To react completely with 0.500 L of volume of 0.500 M Na2CO3, you would need 0.250 L of 2.00 M HCl.

Write down the balanced chemical equation for the reaction between HCl and Na2CO3:

2 HCl + Na2CO3 → 2 NaCl + H2O + CO2

Determine the stoichiometry of the reaction:

From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Na2CO3.

Calculate the number of moles of Na2CO3:

Given that the volume of Na2CO3 solution is 0.500 L and the concentration is 0.500 M, we can use the formula:

Moles = Concentration × Volume

Moles of Na2CO3 = 0.500 M × 0.500 L = 0.250 moles

Use the stoichiometry to determine the number of moles of HCl needed:

According to the stoichiometry of the balanced equation, 1 mole of Na2CO3 reacts with 2 moles of HCl.

Therefore, to react with 0.250 moles of Na2CO3, we would need 2 × 0.250 = 0.500 moles of HCl.

Convert moles of HCl to volume:

Given that the concentration of HCl is 2.00 M, we can use the formula:

Volume = Moles / Concentration

Volume of HCl = 0.500 moles / 2.00 M = 0.250 L

Convert the volume to liters:

The final answer is 0.250 liters of 2.00 M HCl are needed to react completely with 0.500 L of 0.500 M Na2CO3.

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The can be obtained by using the balanced chemical equation: Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2  Write the balanced chemical equation for the reaction.

Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2

Calculate the number of moles of Na2CO3. Using the formula n = c × V, where n is the number of moles, c is the concentration, and V is the volume, we get:

n = c × V

= 0.500 M × 0.500 L

= 0.250 mol

Calculate the number of moles of HCl required.The balanced chemical equation shows that 2 moles of HCl react with 1 mole of Na2CO3. Hence, the number of moles of HCl required can be calculated as follows

:n(HCl) = 2 × n(Na2CO3)

= 2 × 0.250 mol

= 0.500 mol

Calculate the volume of 2.00 M HCl required.The number of moles of HCl required is 0.500 mol. Using the formula V = n/c, where V is the volume, n is the number of moles, and c is the concentration, we get:

V = n/c

= 0.500 mol ÷ 2.00 M

= 0.250 L

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A 905kg car travels around a circular track with a radius of 525 m. If the


magnitude of the centripetal force is 2140 N, what is the car's tangential


speed?

Answers

When a 905kg car travels around a circular track with a radius of 525 m and with the magnitude of the centripetal force is 2140 N, then car's tangential speed would be approximately 23.8 m/s.

The centripetal force acting on an object moving in a circular path is given by the formula Fc = m * v^2 / r, where Fc is the centripetal force, m is the mass, v is the tangential speed, and r is the radius of the circular path. Rearranging the formula, we have
v^2 = Fc * r / m
Substituting the given values, we have v^2 = (2140 N) * (525 m) / (905 kg). Solving for v, we find v ≈ 23.8 m/s. Therefore, the car's tangential speed is approximately 23.8 m/s.

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Is this conversion correct?
11.3g/ cm^3 to kg/ m^3
Since 1000 g = 1 kg and 100 cm = 1 m
Therefore, (11.3 x 1000)/ 100
= 113 kg/ m^3

Answers

11.3 g/cm³ equals to 1130  kg/m³.

What is density?

The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol ρ, however Latin letter D may also be used. Density is calculated mathematically by dividing mass by volume.

Given that 11.3 g/cm³.

Know that

1000 grams = 1 kg

1 grams = 1/1000 kg.

100 cm = 1 m

1 cm = 1/100 m.

Therefore, 1 cm³ = (1/100)³ m³

= 1/1000000 m³

Hence, 1  g/cm³ = (1/1000) ÷ (1/1000000)  kg/m³

= 1000000/1000 kg/m³

= 1000 kg/m³.

Hence, 11.3 g/cm³ = (11.3 × 1000) kg/m³

= 1130  kg/m³

Hence, 11.3 g/cm³ equals to 1130  kg/m³.

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A wave on the surface of the ocean with wavelength 44m is travelingeast at a speed of 18m/s relative to the ocean floor. If on, thisstretch of ocean surface, a powerboat is moving 15m/s (relative tothe ocean floor), how often does the boat encounter a wave crest,if the boat is traveling a) west and
b) east?
Please show formulas.

Answers

The boat encounters a crest every 14.65 s when moving in the west direction and every 1.33 s when moving in the east direction.

Given: The wavelength, λ = 44 mThe speed of the wave, v = 18 m/s

The speed of the boat, vB = 15 m/sa) When the boat is moving west:

When the boat is moving in the west direction, the wave velocity becomes v1 = v − vB = 18 m/s − 15 m/s = 3 m/s

The frequency of the wave, f = v1 / λ = 3 m/s / 44 m = 0.0682 Hz

Let f1 be the frequency of the wave when the boat is moving in the west direction.

b) When the boat is moving east:When the boat is moving in the east direction, the wave velocity becomes v2 = v + vB = 18 m/s + 15 m/s = 33 m/s

The frequency of the wave, f = v2 / λ = 33 m/s / 44 m = 0.75 Hz

Let f2 be the frequency of the wave when the boat is moving in the east direction.The time period of the wave, T = 1/f

Therefore, the time taken by the boat to encounter a crest isT1 = 1/f1 = 1/0.0682 = 14.65 s (when the boat is moving in the west direction)T2 = 1/f2 = 1/0.75 = 1.33 s (when the boat is moving in the east direction)

Therefore, the boat encounters a crest every 14.65 s when moving in the west direction and every 1.33 s when moving in the east direction.

Note: The frequency of the wave can be calculated by the formula:f = v / λ where v is the velocity of the wave, λ is the wavelength of the wave.

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20 Points if you say is asap


Length is to meter as
A Mass is to gram
B Cubic centimeters is to distance
С Liter is to distance D Weight is to mass
d. liter is to distance​

Answers

Answer:

a. mass is to gram

Explanation:

The coefficient of coincidence reflects the frequency of observed double crossovers compared to the frequency of expected double crossovers. What is the relationship between the coefficient of coincidence and interference

Answers

The Coefficient of Coincidence (COC) and interference are two related measurements used to study genetic recombination during meiosis. COC is defined as the ratio of observed double crossovers to predicted double crossovers. Interference, on the other hand, quantifies how much one crossing event interferes with the occurrence of a second crossover event on the same chromosome.

COC and interference have an inverse relationship: as interference increases, COC drops. This is because interference diminishes the possibility of two crossovers happening at the same time. If the interference is significant, a crossing event in one part of the chromosome reduces the chance of a crossover event in an adjacent region.

As a result, the observed frequency of multiple crossings will be lower than predicted, resulting in a smaller COC. In contrast, if interference is minimal, the observed frequency of double crossings would be higher than predicted, resulting in a bigger COC. As a result, the COC and interference are related measurements that can shed light on the mechanisms causing genetic recombination.

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The coefficient of coincidence and interference are two interrelated concepts that provide important information about the frequency and distribution of crossovers in genetic crosses.

The coefficient of coincidence (CoC) and interference are closely related concepts in genetics. CoC is a measure of the frequency of observed double crossovers in a cross compared to the expected frequency of double crossovers. On the other hand, interference is a measure of the extent to which a crossover event in one region of a chromosome affects the likelihood of crossover events in adjacent regions.

The relationship between CoC and interference can be understood in terms of their impact on the frequency and distribution of recombinant gametes. If interference is present, it reduces the frequency of double crossovers and thus lowers the value of CoC. This is because interference restricts the occurrence of crossovers in closely linked regions, reducing the chances of multiple crossovers in those regions. On the other hand, if interference is absent or weak, the frequency of double crossovers increases, leading to a higher CoC value.

Thus, the CoC is an indicator of interference, and it can be used to estimate the strength of interference in a given cross. When the CoC is close to 1, it suggests that interference is weak, while a lower value indicates the presence of strong interference.

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The burning of a log releases the logs chemical_energy into other forms of energy

Answers

Answer:

When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.

Explanation:

Physical Science B - Accommodated Final
1) A gardener moves 5 kilograms bag of soil at an average acceleration rate of 4 m/s to her flower bed, a distance of 5 meters. How much work does the gardener do? Equations - Work = Force x Distance, Force = mass x acceleration
a. 100 n
b.22n
2) It takes 1000 N of force to lift a go kart onto a work table. If the mechanic uses a pulley with a mechanical advantage of 4 to lift the kart, how much force is needed?
a.4000 n
b.250 n
3) What is the advantage of class 3 lever?
a. It increases the distance over which a force needs to be applied
b. It decreases the distance over which a force needs to be applied
4) One end of the lever is pushed down 2 meters to lift a heavy bag up to a surface 1 meter off the ground. If it takes 1000 N of force to lift the bag directly, what amount of force is needed to lift it with the lever?
a. 500 n
b. 2000 n
5) A team of students builds a lever as a science project. They expend 100 Joules of energy to lift some bricks with the lever. If 60 Joules of energy are applied to the bricks, what is the lever’s efficiency?
a. 160%
b. 60%

Answers

The two terms that have been included in the question are:1. Physical Science2. Accommodated FinalNow let's proceed to the question.The statement "It increases the distance over which a force needs to be applied" is describing the property of mechanical advantage.

It's important to note that there are three ways to express mechanical advantage:MA = output force / input forceMA = input distance / output distanceMA = output speed / input speedLet's examine how the different expressions for mechanical advantage apply to the given statement:a. "It increases the distance over which a force needs to be applied."We can see that this expression describes mechanical advantage in terms of distance, which means that MA = input distance / output distance. In this case, the output distance is greater than the input distance, which means that MA is greater than 1. This means that the force applied is multiplied by a factor equal to the mechanical advantage. Therefore, the correct answer is (a)It increases the distance over which a force needs to be applied.Now let's answer the second part of the question:We have to find the percentage increase from 2000 to 160%.Here's how we can do it:First, we need to find the difference between the two values:160% - 2000 = -1840Next, we need to find the percentage change from the initial value to the final value:|-1840 / 2000| × 100% = 92%Therefore, the percentage decrease from 2000 to 160% is 92%.Hence, the answer is 92% in 200 words.

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What would happen in the Sun if fusion reactions suddenly ceased? •Photons will stop radiate from the surface of the Sun, and there will be no any other observable changes because of great mass of the Sun. •Photons would stop to radiate from the Sun in a few hundred years, but the solar wind would increase drastically. •Photons would continue diffuse from the core and radiate from the surface of the Sun for about a million of years. •Without interior radiation pressure, the Sun will contract under its own weight about three times in about a thousand years.

Answers

Without fusion reactions in the Sun, the interior radiation pressure that counteracts the gravitational force would cease. This would cause the core to collapse inward due to the gravitational force, increasing the pressure and temperature in the core. As a result, the outer layers of the Sun would expand outward, causing the Sun to become a red giant.

In this scenario, the correct option would be: Without interior radiation pressure, the Sun will contract under its own weight about three times in about a thousand years.

As the Sun contracts, its core temperature and pressure will continue to increase until helium atoms are able to fuse, which will release energy and cause the outer layers of the Sun to expand outward again. However, since the Sun has already burned most of its hydrogen fuel, this phase of fusion will only last for a short time before the Sun eventually dies.

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10 points
A 61.0 kg box is sitting at rest. In order to change the box's state of
motion, Jamie must apply 75.1 Newtons of force on the box. Which of the
following represents a possible value for the force of static friction when
Jamie applied 75.1 Newtons of force on the box? (**hint- you do not need
to do math for this problem) *
A. 71.9 N
B. 75.1 N
C. 85.3 N
D. 133 N

Answers

The answer is B tell me if I am wrong.

A possible value for the force of static friction when  Jamie applied 75.1 Newtons of force on the box is 75.1N. Option B is correct.

For the box sitting on a horizontal surface, the formula for calculating the force on the box along the horizontal based on Newton's law is expressed as;

\(\sum F_x=ma_x\)

Since the forces acting along the horizontal are the frictional force and moving force, the formula above will become;

\(F_m-F_f=ma_x\)

Since the body is static, hence \(a_x=0m/s^2\), the equation becomes;

\(F_m-F_f=m(0)\\F_m-F_f=0\\F_m=F_f\)

Given the force Jamie apply on the box to be 75.1Newtons, this shows that the moving force is 75.1N. Hence;

\(F_m =F_f=75.1N\)

Hence a possible value for the force of static friction when  Jamie applied 75.1 Newtons of force on the box is 75.1N

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16 When pollen grains in water are viewed through a microscope, they are seen to be in continuous,
rapid random motion.
What causes a pollen grain to move in this way?
A convection currents in the water
B bombardment by a single molecule of water
C
uneven
bombardment on different sides by water molecules
D collision with another pollen grain due to their kinetic energies

Answers

Uneven bombardment on different sides by water molecules.

Water is made up of little, swiftly moving particles. The pollen grains move on the surface of water because they are continually being struck by the swiftly moving water particles (the water particles or water molecules themselves are invisible under the microscope due to their extreme small size). Therefore, even though the water molecules (particles) are too small to discern, their impact on the pollen grains can be readily seen. Brownian motion is exemplified by the haphazard movement of visible particles (pollen grains) brought about by much smaller unseen water particles.The pollen grains will move with some justification if Brownian motion is used to explain the observation in the question.Brownian motion is the irregular (constant but random) movement of small particles suspended in a fluid, according to its definition. A disturbance in the medium holding the suspended particles is what is responsible for the motion. In other words, it is brought on by some fluid disruptions, which may have been brought on by some bombardments.

Therefore, option C is correct.

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Describe what physical and/or chemical treatments you would require prior to liftoff to minimize the opportunity for contamination of the ELV (the landing module of the spacecraft) and ELVIS (a new version of the robot) by Earth microbes.

Answers

The Physical Treatment includes sterilization of the spacecraft and landing module by heat, radiation, or chemical means. and Chemical treatments may include the use of biocides or antimicrobial coatings on critical surfaces required prior to liftoff to minimize the opportunity for contamination of the ELV and ELVIS by Earth microbes.

Prior to liftoff, it is crucial to implement physical and chemical treatments to minimize the opportunity for contamination of the ELV and ELVIS by Earth microbes. In Physical treatments, the spacecraft must be thoroughly cleaned to remove any organic material that may contain microbial life. It is also important to limit human contact with spacecraft to reduce the risk of introducing microbes.

In Chemical treatments, Biocides can be used to kill any remaining microbes on surfaces that cannot be sterilized. Antimicrobial coatings can be applied to surfaces that come into contact with the environment to prevent microbial growth. Additionally, all equipment and materials that are brought onto the spacecraft must be carefully screened and sterilized. This includes any scientific instruments, tools, and personal items that may be brought aboard.

Overall, implementing physical and chemical treatments prior to liftoff is crucial to minimize the risk of contamination by Earth microbes. This will help ensure the success of scientific experiments and prevent the introduction of harmful organisms to other planets or celestial bodies.

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HELPP ASAP!!Which of the following is a true statement?
A.Organic carbón is found in all living things

B. a compound has different properties from each of its elements

C.Water is made from the elements of carbon and oxygen

D. Hydrogen compounds are the most comment in the world

Answers

Answer:A

Explanation

B a compound can ha e the same properties as it’s elements

C water is H2O- Hydrogen and oxygen

D water is the most common compound

Therefore A must be correct

A small light fixture is on the bottom of a swimming pool, 1.30 m below the surface. The light emerging from the water forms a circle on the still water surface. What is the diameter of this circle?

Answers

Tthe diameter of the circle formed on the still water surface by the light emerging from the swimming pool is approximately 2.91 meters.

To determine the diameter of the circle formed on the water surface by the light emerging from the swimming pool, we need to consider the principles of refraction. When light passes from one medium (such as water) to another (such as air), it changes direction due to the difference in refractive indices.

Given that the light fixture is 1.30 m below the surface of the water, the light rays will bend as they emerge from the water into the air. The bending occurs because the speed of light is slower in water than in air.

The angle of incidence can be calculated using Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two media. Assuming the refractive index of water is approximately 1.33 and the refractive index of air is approximately 1.00, we can calculate the angle of incidence.

By using basic trigonometry, we can find that the angle of incidence is approximately 48.75 degrees. Now, considering that the diameter of the circle formed on the water surface will be twice the distance from the light fixture to the surface, we can calculate the diameter.

Diameter = 2 * 1.30 m * tan(48.75 degrees) ≈ 2.91 m.

Therefore, the diameter of the circle formed on the still water surface by the light emerging from the swimming pool is approximately 2.91 meters.

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Which substances form due to a chemical reaction?
F Mass
G Products
H Atoms
Reactants

Answers

I believe it’s the last one

The substance that forms due to a chemical reaction is product. The correct option is G.

What is a chemical reaction?

A chemical reaction is a process that converts one or more substances, known as reactants, into one or more various substances, known as products.

Chemical elements or substances are examples of substances. A chemical reaction reconfigures the constituent atoms of the reactants to produce various products.

Living things (cells, animals, humans, and insects) use chemical reactions to grow, develop, reproduce, and adapt.

When chemical bonds between molecules are formed or broken, chemical reactions occur.

The substances that initiate a chemical reaction are known as reactants, and the substances that result from the reaction are known as products.

Thus, the correct option is G.

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The discharge of electrons from a negatively charged object is sometimes seen as an arc, and the arc distance is a function of the _____ between the bodies.

Answers

Arc distance is a function of the potential difference between the negatively charged object and other bodies.

The discharge of electrons from a negatively charged object can produce an arc that bridges the gap between the charged object and other bodies.

The distance of this arc is directly related to the potential difference between the negatively charged object and the other bodies.

The greater the potential difference, the greater the likelihood of an arc discharge occurring, and the greater the distance the arc will bridge.

This phenomenon is commonly observed in electrical equipment and is a major concern in the design of high-voltage systems.

Understanding the relationship between potential difference and arc distance is critical for ensuring the safe and reliable operation of electrical systems.

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Two blocks A and B of masses 5 kg and 1 kg are connected with the help of massless strings

The system is just at the verge of slipping. The coefficient of static friction between the block A and surface below it is

Answers

Answer:

The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g = 10 m/s)

Two blocks A and B of masses 5 kg and 1 kg are connected with the help of massless strings The system

The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g = 10 m/s).

In which condition block B moves?

Two blocks A and B of masses 5 kg and 1 kg are connected with the help of massless strings and the system is just at the verge of slipping. The coefficient of static friction between the block A and surface below it is necessary to move the block B.

Static friction is the friction that exists between two surfaces that are not trying to move over each other and which must be overcome before one object starts moving the other.

Two blocks are static equilibrium indicates that the force acting on both blocks is equal.

The frictional force acting on block A is calculated as follows:

Frictional force =  coefficient of static friction * normal reaction

Normal reaction on Block A = 30 * 9.8

The coefficient of static friction between block A and the surface = 0.55

Frictional force = 30 * 9.8 * 0.55

Force on Block B = 161.7

Mass of Block B = 161.7 / 9.8

Mass of Block = 18 kg

Therefore, The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g = 10 m/s).

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Two massive spheres are mounted on a light rod that can be rotated by a string wrapped around a central cylinder, forming a winch as shown in the figure. (Figure 1) A force of magnitude F is applied to the string to turn the system. With respect to the variables given in the figure, the equation for the magnitude of the angular acceleration α is α=rF/3mR^2.
1. If the sphere on the left is moved closer to the central cylinder and placed at a distance R/2 from the axis of rotation, what is the magnitude of the angular acceleration α of the modified system? Assume that the rest of the system doesn't change.
2.Consider again the original system. Instead of applying the force to the string, a force with the same magnitude F is applied to the rod at a point R/2 from the sphere of mass 2m and in a direction perpendicular to the rod, as shown in the figure.What is the magnitude of the angular acceleration α of the system?

Answers

The equation for the magnitude of the angular acceleration α is α = rF / (3mR^2) where r represents the radius of the spheres, F is the applied force, m is the mass of each sphere, and R is the distance between the center of the cylinder and the center of each sphere.

This equation is derived from the rotational dynamics of the system. The torque τ exerted by the force F is given by τ = rF, where r is the lever arm or radius at which the force is applied. The moment of inertia I of the system is given by I = 2mR^2, considering the two spheres of mass m and distance R.

Using Newton's second law for rotational motion, τ = Iα, and substituting the values, we get rF = 2mR^2 α. Solving for α, we find α = rF / (2mR^2). However, since there are two spheres, we divide by 2 to obtain α = rF / (3mR^2), as stated in the given equation.

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3.58 kg of solution A (2.5% salt) is mixed with 3.77 kg of solution B (4.7% salt). What is the final salt concentration as a percentage?

Answers

To find the final salt concentration as a percentage, we need to calculate the total amount of salt in the final solution and then express it as a percentage of the total volume. The final salt concentration as a percentage is 3.63%.

First, let's calculate the amount of salt in solution A:
3.58 kg x 0.025 = 0.0895 kg
Similarly, the amount of salt in solution B is:
3.77 kg x 0.047 = 0.17719 kg
To find the total amount of salt in the final solution, we add the amounts of salt in solution A and solution B:
0.0895 kg + 0.17719 kg = 0.26669 kg
Now, we need to find the total volume of the final solution by adding the volumes of solution A and solution B:
3.58 kg + 3.77 kg = 7.35 kg
Finally, we can express the final salt concentration as a percentage:
0.26669 kg ÷ 7.35 kg x 100% = 3.63%

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block a of mass 4m is attached by a light string to block b of mass 2m. the string passes over a pulley with negligible friction and of negligible mass. block a is held a distance h above the ground, as shown. the blocks are released from rest, and block a reaches the ground two seconds later. the value of h is most nearly

Answers

The kinematics and Newton's second law allow us to find the height from which the block system descends is:

             y = 6.54 m

Given parameters

Body mass m1 = 4 kg The mass of the body on the ground m² = 2 kg The descent time t = 2s

To find

Body height

Newton's second law gives a relationship between the net force, the mass, and the acceleration of the body.

      ∑ F = m a

Where the bold letters indicate vectors, F is the force, m the mass and the acceleration of the body.

Kinematics studies the movement of bodies, looking for relationships between position, velocity and acceleration

              y = v₀ t + ½ a t²

In the attached we have a free body diagram of the system, let's write Newton's second law.

          T - W₁ = m₁ a

         -T + W₂ = m₂ a

Let's solve the system of equations.

          W₂ - W₁ = (m₁ + m₂) a

          a = \(\frac{m_2-m_1}{m_2+m_1} \ g\)

Let's calculate

          a = \(\frac{2 -4}{ 2 +4} \ 9.8\)  

          a = -3.27 m / s²

The negative sign indicates that the heaviest body is descending.

Now we can use kinematics to find the height, as the system comes out of rest the initial velocity is zero, when he reaches the ground his height is zero.

             y = y₀ + v₀ t + ½ a t²

             0= y₀ + 0  +½ a t²          

Let's calculate

             y₀ = ½ 3.27 2²

             y = 6.54 m

In conclusion, using kinematics and Newton's second law we can find the height from which the block system descends is:

             y = 6.54 m

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block a of mass 4m is attached by a light string to block b of mass 2m. the string passes over a pulley

Which statement below is Gauss's Law for electric fields? Please note, we are not asking which statement is true, we are asking which statement is Gauss's Law. As an example, 2+2-4 is true but it is not a statement of Gauss's Law. O The electric flux through a surface is equal to the integral of the normal component of the electric field over the surface O 2+2-4 The electric flux through a closed surface is equal to the net charge inside the surface divided by the physical constant The electric flux is equal to the amount of charge flowing through a surface in a given time.

Answers

“The electric flux through a closed surface is equal to the net charge inside the surface divided by the physical constant. This law is a fundamental principle in electrostatics and is expressed mathematically as E.ds = Q/ε0.

Gauss’s Law for electric fields is a fundamental principle in physics, specifically in the study of electrostatics. The law describes the relationship between the electric flux and the distribution of electric charges in a given space. Simply put, it states that the electric flux through a closed surface is proportional to the total amount of electric charges inside the surface. In mathematical terms, the statement of Gauss’s Law for electric fields is as follows: E.ds = Q/ε0Here, E.ds represents the electric flux through a closed surface, Q represents the total electric charge enclosed within the surface, and ε0 is the physical constant known as the permittivity of free space. This equation can be used to calculate the electric field created by a given charge distribution, provided that the electric flux through a closed surface around the distribution is known.

Gauss’s Law for electric fields states that the electric flux through a closed surface is proportional to the net electric charge enclosed within the surface. This law is a fundamental principle in electrostatics and is expressed mathematically as E.ds = Q/ε0.

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A car travels 50 kilometers in 30 minutes. Which
about the motion of the car are true?

Answers

Answer:

1500

Explanation:

is that all the question?

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