3. A block is pushed with 30N of force this changes the velocity from 20m/s to
30m/s, after 2 seconds. What is the mass?
Answers
let's find the acceleration first :
\( \boxed{a = \frac{v - u}{t} }\)\(a = \dfrac{30 - 20}{2} \)\(a = \dfrac{10}{2} \)\(a = 5 \: \: ms {}^{ - 2} \)now, we know that :
\(f orce= mass \times acceleration\)\(30 = m \times 5\)\(m = \dfrac{30}{5} \)\(m = 6 \: \: kg\)hence, mass = 6kg
Related Questions
A 0. 2-kilogram red ball is thrown horizontally at a speed of 4 meters per second from a height of 3 meters. A 0. 4-kilogram green ball is thrown horizontally from the same height at a speed of 8 meters per second. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is.
Answers
The time takes for the green ball to reach the ground is equal to 0.78 s. As both balls are thrown from the same height they will take the same time to reach the ground irrespective of their velocity.
What is the equation of motion?The equations of motion can be described as the equations which establish the relationship between the time, velocity, acceleration, and displacement of a moving object.
The equations of motions as the mathematical expressions:
\(v = u +at\\S = ut +(1/2)at^2\\v^2-u^2= 2aS\)
Given, the height from which the ball is thrown, h = 3
From the 2nd equation of motion, calculate the time taken by the ball reach to the ground:
H = ut + (1/2)gt²
3 = 0 + (1/2)× 9.8×t²
t = 0.78 s
As the time is independent of the velocity of a ball so both balls take the same time to reach the ground as they are thrown from the same height.
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Explain how energy is converted from potential to kinetic energy when a pendulum is swinging
Answers
Answer:
Once the weighted end of the pendulum is released, it will become active as gravity pulls it downward. Potential energy is converted to kinetic energy, which is the energy exerted by a moving object. An active pendulum has the most kinetic energy at the lowest point of its swing when the weight is moving fastest.
Explanation:
BROADCASTING Interference occurs when two waves pass through the same space at the same time. It is destructive if the amplitude of the sum of the waves is less than the amplitudes of the individual waves. Determine whether the interference is destructive when signals modeled by y=20sin (3t+45∘) and y=20sin(3t+225∘) are combined.
Answers
The interference is not destructive, the interference is constructive.
Interference can be constructive or destructive. When two waves pass through the same space at the same time, it is known as interference. If the amplitude of the sum of the waves is less than the amplitudes of the individual waves, then interference is destructive.
Hence, we have to determine whether the interference is destructive when signals modeled by y=20sin (3t+45∘) and y=20sin(3t+225∘) are combined.
In this case, the amplitude of both signals is the same. Hence, we can ignore the amplitude term and consider only the angle component.
The two signals can be rewritten in terms of the angle component as follows:
y1=3t+45°y2=3t+225°
To find the resultant of the two signals, we add the two signals:
yR=y1+y2=y1=3t+45°+y2=3t+225°=6t+270°
We know that the sine function repeats itself every 360 degrees. Hence, we can rewrite the above equation as:
yR=6t+270°=6t+360°−90°=6t−90°
From the above equation, the resultant signal can be written as: yR=20sin(6t−90°)To determine whether the interference is destructive or not, we check if the amplitude of the resultant wave is less than the individual waves.
Since the amplitude of each signal is 20, the amplitude of the resultant wave is also 20. Hence, the interference is constructive. This is because the two signals are exactly out of phase, and they interfere to create a stronger signal. Therefore, the interference is not destructive.
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The acceleration due to gravity on the surface of Earth is g. Calling R the radius of Earth, at what distance from Earth's center would the acceleration due to gravity drop to g/16?
A)2 R
B)R/4
C)R/16
D)16 R
E)4 R
Answers
The acceleration due to gravity on the surface of Earth id represented by g. At a distance R/16 from Earth's center, the acceleration due to gravity would decrease to g/16. The correct option for the above question is C)R/16.
Distance from Earth's center where acceleration due to gravity drop to g/16:
Let M be the mass of the Earth and m be the mass of the body that is under consideration.
Let R denote radius of the Earth.
The distance from the center of the Earth is equal to x.
Let a be the acceleration due to gravity at distance x.
Then at a distance of R from the center of the Earth, the acceleration due to gravity is g.
Mass of the Earth M = (4/3)πR³ ρ.
Where ρ Earth's density.
Let a be the acceleration due to gravity at distance x.
Then, using Newton's universal law of gravitation,
Ma = (G M m) / x²
And at the surface of the Earth (at distance R from the center of the Earth),
Mg = (G M m) / R²
Where G is the gravitational constant.
By dividing these two equations, we get
a / g = (R / x)²Or, x / R = √(g / a)
Distance from Earth's center where acceleration due to gravity drop to g/16 is given by:-
a / (g/16) = [(x')² / R²]
Where a' is the acceleration due to gravity at a distance x'.
Then, (x' / R)² = (a / a') (g/16) = (1/16)
Then, x' / R = 1/4Hence, x' = (1/4)R
Therefore, the distance from Earth's center where acceleration due to gravity drops to g/16 is (1/4)R or R/4.Option (C) is correct.
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Compute the future value of a $115 cash flow for the following combinations of rates and times. (Do not round intermediate calculations. Round your answers to 2 decimal places.) a. r = 7%; t = 10 years b. r = 7%; t = 20 years c. r = 3%; t = 10 years d. r = 3%; t = 20 years
Answers
The future values for the given combinations are approximately:a. $210.24, b. $386.97, c. $139.63, d. $181.97
To compute the future value of a cash flow, we can use the formula for future value of a single cash flow:
Future Value = Cash Flow × (1 + Rate)ᵗ
Let's calculate the future value for each combination of rates and times:
a. r = 7%; t = 10 years
Future Value = $115 × (1 + 0.07)¹⁰
Future Value ≈ $210.24
b. r = 7%; t = 20 years
Future Value = $115 × (1 + 0.07)²⁰
Future Value ≈ $386.97
c. r = 3%; t = 10 years
Future Value = $115 × (1 + 0.03)¹⁰
Future Value ≈ $139.63
d. r = 3%; t = 20 years
Future Value = $115 × (1 + 0.03)²⁰
Future Value ≈ $181.97
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PLEASE HELP, NO ONE IS HELPING MEEEE :(
While taking the stairs it takes you 10 seconds to reach the top. The next time you take the same stairs, it takes you 5 seconds to reach the top stair. During which of these trips up the stairs did you use more power to climb?
Answers
Answer:
probably the trip where it took u 5 seconds
Assertion (a): In a series circuit, the current is constant throughout the electric circuit.
Reason (R): All electric devices need equal currents to operate properly.
Answers
The given assertion 'In a series circuit, the current is constant throughout the electric circuit' is correct but the reason 'All electric devices need equal currents to operate properly' is incorrect.
A circuit is said to be connected in series when the same current flows through all the components in the circuit. The current in these circuits only travels along one route.
A higher total voltage is produced by series-connected cells than by single cells. Voltage increases if the number of cells increases. Series circuits do not overheat easily.
All the electrical devices do not require equal amount of current for their functioning. For example, an electric heater and an electric fan do not require the same amount of current.
In a series combination, if one component fails, all other components stop working.
Series connection is not suitable for domestic circuits.
Therefore, while the assertion is true, the reason is false.
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express the following quantites of mass (in units of grams) using the metric prefixes rather than scientific notion
1.9x10^-2g
5.2x10^12g
4.1x10^-18g
3.91x10^15g
Answers
The prefixes are;
9x10^-2g - 9cg5.2x10^12g - 5.2 pg4.1x10^-18g - 4.1 Eg91x10^15g - 91 PgWhat is the metric system?The metric system is one of the systems of measurement that is in common use. We know that there are many different systems of measurement that are in common use. However, the metric system is more current because is the system that helps us to be able to obtain a lot of the values that we use in science today.
Now the metric system is largely made up of the gram, the centimeter and the second. This has helped to make the measurement of scientific quantities very easy all over the world. We do have the subunits of these units in the metric system which are obtained by the use of prefixes.
Let us now write the prefixes;
9x10^-2g - 9cg5.2x10^12g - 5.2 pg4.1x10^-18g - 4.1 Eg91x10^15g - 91 PgLearn more about metric units:https://brainly.com/question/28524514?
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Which explanation best compares the movement of particles in the three states of matter?
A.
Particles in a gas can only vibrate. In a solid, they slide against each other. In a liquid, they move freely, bouncing and bumping into each other.
B.
Particles in a solid can only vibrate. In a liquid, they slide against each other. In a gas, they move freely, bouncing and bumping into each other.
C.
Particles in a liquid can only vibrate. In a gas, they slide against each other. In a solid, they move freely, bouncing and bumping into each other.
D.
Particles in a solid can only vibrate. In a gas, they slide against each other. In a liquid, they move freely, bouncing and bumping into each other.
E.
Particles in a liquid can only vibrate. In a solid, they slide against each other. In a gas they move freely, bouncing and bumping into each other.
Answers
Answer: B
Explanation:Solids are packed thus molecules are restricted and can only vibrate. Liquids, on the other hand, molecules can move and slide against each other since they are loosely packed. Lastly, gas particles is very loosely packed so they can move freely.
Particles in a solid can only vibrate. In a liquid, they slide against each other. In a gas, they move freely, bouncing and bumping into each other.
A particle with unknown mass and charge is projected into the apparatus shown above. The particle moves with constant speed v as it passes undeflected through a pair of parallel plates, as shown. The plates are separated by a distance d, and a constant potential difference V is maintained between them. A uniform magnetic field of magnitude B directed into the page exists both in the region between the plates and in the region to the right of the plates that is enclosed by the dashed lines. In the region to the right of the plates, the particle's path is circular with radius r. Assume the effects of gravity are negligible compared to other forces.A) Explain why the particle moves through the parallel plates undeflected in terms of the forces exerted on the particle. B) What is the sign of the charge on the particle?
Answers
a) The particle moves through the parallel plates undeflected because the electric force is balanced by the magnetic force.
b) The sign of the charge on the particle can be determined by the direction of the magnetic field and the direction of the particle's motion.
a) The particle moves through the parallel plates undeflected because the electric force and the magnetic force on the particle are equal in magnitude and opposite in direction. The electric force is given by F_e = qE, where q is the charge on the particle and E is the electric field between the plates. The magnetic force is given by F_B = qvB, where v is the velocity of the particle and B is the magnitude of the magnetic field. In this case, the electric field between the plates is perpendicular to the magnetic field, so the forces are perpendicular and the particle moves undeflected.
b) The sign of the charge on the particle can be determined by the direction of the magnetic field and the direction of the particle's motion. Since the particle moves in a clockwise direction in the region to the right of the plates, the magnetic force on the particle must be directed towards the center of the circle. This means that the direction of the magnetic field is out of the page, which can only be the case if the charge on the particle is negative. If the charge were positive, the magnetic force would be directed out of the page, and the magnetic field would have to be directed into the page to balance the electric force, which is not the case. Therefore, the particle has a negative charge.
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Somatic versus Sex Cells
2. How do the chromosomes in most cells of an organism, such as the leaf cells of a plant, compare to the chromosomes in its reproductive cells, which are sperm and egg cells?
Answers
Most cells in an organism, such as leaf cells in a plant, are somatic cells. Somatic cells contain two sets of chromosomes, one inherited from each parent, and are diploid. In humans, for example, somatic cells contain 46 chromosomes, arranged in 23 pairs.
On the other hand, reproductive cells, such as sperm and egg cells, are sex cells or gametes. Gametes are haploid, which means they contain only one set of chromosomes, half the number found in somatic cells. In humans, gametes contain 23 chromosomes, which are not arranged in pairs.
The purpose of gametes is to combine during fertilization to produce a zygote, which contains a complete set of chromosomes (i.e., diploid). This ensures that the offspring will have genetic diversity and not be identical to either parent.
The process of reducing the number of chromosomes in gametes from diploid to haploid is called meiosis. Meiosis is a type of cell division that occurs only in gamete cells, and results in the production of four haploid daughter cells, each containing a unique combination of chromosomes.
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Please, help me!!! It's due today!!
Answers
Answer:
The question is incomplete.
It asks you to use the formula W = F * D (force times distance)
But the question only gives the work W in joules.
You would need to know the weight of the object to get the distance moved or the distance moved to get weight if you are only given the work done.
Incidentally, the mechanical advantage in diagram is A is 1 whereas the mechanical advantage in B is 2.
So in B you would apply 1/2 the force as in A and would have to move the rope twice as far as in A to do the same amount of work.
according to newton’s second law, if there is a net force, there will be
Answers
Answer:
The object will have an acceleration and the object's velocity will change.
Explanation:
If there is a net force acting on an object, the object will have an acceleration and the object's velocity will change. Newton's second law states that for a particular force, the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object.
PLS MARK BRAINLIEST
help pls .. Which equation states Newton's second law?
Answers
Answer:
Choice C
m = F/a
Explanation:
[Force] F = [mass × acceleration] ma
× A) m = a/F → F ≠ a/m
× B) m = Fa → F ≠ m/a
✓ C) m = F/a → F = ma
× D) m = Fa/2 → F ≠ 2m/a
Answer:
ithink ....... sorry if it wrong
d
Friction is a force in which two objects __________. A. Collide and move in one direction B. Are repelled from each other C. Slide against each other D. Are attracted from a distance Please select the best answer from the choices provided. A B C D.
Answers
Answer: (C) Slide against each other
Explanation:
Think about rubbing our palms together, and they get warm that right there is friction.
Answer:
slide against each other
Explanation:
Astronaut Jill leaves Earth in a spaceship and is now traveling at a speed of 0.280c relative to an observer on Earth. When Jill left Earth, the spaceship was equipped with all kinds of scientific instruments, including a meter stick. Now that Jill is underway, how long does she measure the meter stick to be
Answers
Jill would measure the meter stick to be approximately 0.959 meters long while she is traveling at a speed of 0.280c according to special relativity.
According to special relativity, when an object is moving at a significant fraction of the speed of light, length contraction occurs. This means that the length of an object in motion appears shorter to an observer in another reference frame.
In this case, Jill is traveling at a speed of 0.280c relative to an observer on Earth. To calculate the length contraction, we can use the Lorentz contraction formula:
L' = L * √(1 - (v^2/c^2))
L' is the measured length (in the spaceship's frame of reference)
L is the rest length (length of the meter stick on Earth)
v is the relative velocity (0.280c)
c is the speed of light
Assuming the rest length of the meter stick is 1 meter (L = 1 m), we can substitute the values into the formula:
L' = 1 m * √(1 - (0.280c)^2/c^2)
L' = 1 m * √(1 - 0.0784)
L' = 1 m * √(0.9216)
L' ≈ 0.959 m
Therefore, Jill would measure the meter stick to be approximately 0.959 meters long while she is traveling at a speed of 0.280c.
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a capacitor of capacitance c is charged by an emf through a resistance r. the time constant describes how quickly the voltages and currents change while the capacitor charges. which statement about the time constant is true?
Answers
The statement that is true about the time constant is that the product of the resistance R and the capacitance C is equal to the time constant τ of the charging capacitor.
A time constant describes the rate of change of current or voltage in a circuit. When an RC (resistance-capacitance) circuit is charged, the time constant represents the duration required for the capacitor to charge to 63.2% of its maximum charge potential. It also represents the time required for the capacitor to discharge to 36.8 percent of its maximum potential.
The formula for calculating the time constant of an RC circuit is:τ = RC.
Where R is resistance, and C is capacitance.
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You see a lightning bolt flash in the distant sky. You hear the corresponding thunder 6.8 seconds later. If the temperature is 28º C, how far away in, kilometers, from you did the lightning strike?
Answers
Answer:
\(Distance = 2.4\ km\)
Explanation:
Given
\(Time (t) = 6.8s\)
\(Temperature = 28C\)
Required
Determine the distance at which the lighting struck
First, we need to determine the speed at which the lighting struck because the peed of sound varies with temperature.
At about 28C, the speed of sound is 346m/s
So, we have the following:
\(Speed = 346m/s\)
\(Time = 6.8s\)
Distance is calculated as thus:
\(Distance = Speed * Time\)
\(Distance = 346m/s * 6.8s\)
\(Distance = 2352.8\)
Divide by 1000 to get distance equivalent in kilometers
\(Distance = \frac{2352.8km}{1000}\)
\(Distance = 2.3528km\)
\(Distance = 2.4\ km\) ---- Approximated
A train is travelling at a speed
of 90 km h-¹. Brakes are applied
so as to produce a uniform
acceleration of - 0.5 m s-². Find
how far the train will go before it
is brought to rest.
Answers
Explanation:
\(speed : \)
\(speed : U = \frac{(90 \times 1000) \: m}{(1 \times 3600) \: s} \\ = 25 \: m {s}^{ - 1} \\ from \: third \: equation \\ {V}^{2} = {U}^{2} + 2aS \\ 0 = {25}^{2} \times (2 \times - 0.5 \times S) \\ 625 = S \\ S = 625 \: m\)
What factors could slow down a reaction time?
Answers
Answer: To keep it basic start with temprature and inhibitors such as drugs that slow enzymes
surface area, temperature, concentration, and the presence of catalysts and inhibitors
Explanation:To slow down a reaction, you need to do the opposite. Factors that can affect rates of reactions include surface area, temperature, concentration, and the presence of catalysts and inhibitors. Temperature - Changing the temperature of a chemical reaction also affects the reaction rate.
Answer:
In driving, changes by fractions of a second in reaction time may mean the difference between a collision or the avoidance of one. On the road, distractions, speed, driving experience, and physical and cognitive fitness can seriously affect reaction times.
Explanation:
ig this
Which statement about the reaction is correct?
(1 point)
O H2O is an acid, and Cr is its conjugate base.
O HCl is an acid, and Cl- is its conjugate base.
O H2O is an acid, and H3O* is its conjugate base.
O HCl is an acid, and H3O* is its conjugate base.
Answers
Answer:
I think D am not pretty show
Answer:
(Question 1) How are acids and protons related?
(Answer) An acid can donate protons to a base when they react.
(Question 2 )Which statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0?
(Answer) The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.
(Question 3) {HCI + H2O ---> CI-+H30+ } Which statement about the reaction is correct?
(Answer) HCl is an acid, and Cl– is its conjugate base.
(Question 4) Which pattern in electronegativity do elements in the periodic table display?
(Answer) Electronegativity increases from left to right within a row of the periodic table.
(Question 5) Which option correctly shows the concentration of H3O+ ions in pure water?
(Answer) 1.0 × 10-7 mol/L
Explanation:
I just finished the quick, enjoy UwU.
which is a harmful role of bacteria of bacteria?
Answers
Answer:
Harmful bacteria are called pathogenic
Explanation:
Harmful bacteria are called pathogenic bacteria because they cause disease and illnesses like strep throat, staph infections, cholera, tuberculosis, and food poisoning.
What acceleration can a 1-newton force give to a 1-kilogram object?
Answers
Answer: 1 m/s/s
Explanation: One Newton is defined as the amount of force required to give a 1-kg mass an acceleration of 1 m/s/s.
What are sport skills sometimes referred to as?
a skill-related fitness
b. performance skills
c. health-related fitness
d. physical fitness
Answers
calculate [h3o+] of the following polyprotic acid solution: 0.130 m h3c6h5o7.
Answers
The [H3O+] concentration of a 0.130 M solution of H3C6H5O7 can be calculated using the acid dissociation constants (Ka) of each ionization step and the equilibrium concentrations of each species.
H3C6H5O7 is a polyprotic acid, which means it can donate more than one hydrogen ion (proton) in solution. Each ionization step has its own acid dissociation constant, which determines the extent to which the acid dissociates in solution and the relative concentrations of the acid and its conjugate base.
To calculate [H3O+] of the solution, the acid dissociation constants and equilibrium concentrations of each species must be taken into account. The first ionization step can be written as follows:
H3C6H5O7 ⇌ H+ + HC6H5O7-
The equilibrium constant for this reaction is Ka1 = [H+][HC6H5O7-]/[H3C6H5O7]. Using the initial concentration of H3C6H5O7, the equilibrium concentration of H+ and HC6H5O7- can be calculated.
The same process can be repeated for the second and third ionization steps using their respective acid dissociation constants, Ka2 and Ka3.
Once the equilibrium concentrations of all species are known, the [H3O+] can be calculated using the equation [H3O+] = Kw/[OH-], where Kw is the ion product constant of water (1.0 x 10^-14 at 25°C).
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5) A net force of 12 Newtons acting north on an object for 4.0 seconds will produce an impulse of
A) 3.0 kg-m/sec north
B) 48 kg-m/sec north
C) 3.0 kg-m/sec south
D) 48 kg-m/sec south
Answers
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
The surprising observational fact about quasars is that they appear Select one: a. to be the largest known structures in the universe, although they produce only modest amounts of energy. b. to be moving rapidly toward us, while emitting large amounts of energy. c. to be associated with ancient supernova explosions. d. to produce the energy output of 1000 galaxies in a volume similar to that of our planetary system.
Answers
The surprising observational fact about quasars is that they appear to produce the energy output of 1000 galaxies in a volume similar to that of our planetary system.So option d is correct.
The surprising feature of quasars is their ability to produce the energy output of 1000 galaxies within a volume comparable to that of our planetary system.Quasars are astronomical objects that emit massive amounts of energy, making them some of the most luminous objects in the universe. Despite their compact size, they produce an energy output comparable to 1000 galaxies. This incredible energy generation occurs within a volume similar to that of our planetary system, which is much smaller than the typical size of a galaxy.Therefore option d is correct.
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Education/training
What are the typical entry-level education requirements, on-the-job training, licenses,
certifications, work experience, and advancements?
What are some important qualities that are helpful in performing this work?
the questions are about being a nurse btw please help !!!!
Answers
Answer: You need your bachelor's to become a nurse at an entry level.
Explanation: Most nurses enter nursing knowing they will eventually earn their baccalaureate degree. While it’s possible to obtain an Associate Degree in Nursing (ADN), capped by earning one’s RN license by taking and passing the standardized NCLEX-RN exam, many nurses choose to further their education—and career prospects—by obtaining their baccalaureate degree. Requirements vary by state, but at the very least, the path to RN usually involves earning an Associate Degree in Nursing (ADN), qualifying a candidate to take the standardized national licensure examination known as NCLEX-RN. Only after taking this exam and passing may a nurse work as an RN. This is true of all states and the District of Columbia. Some localities may also have additional requirements.
RN - Registered Nurse
Hope this helps
:)
If a baseball has a negative velocity and a negative acceleration, its speed is
O increasing
decreasing
unknown
constant
Answers
If a baseball has a negative velocity and a negative acceleration, its speed is decreasing.
Velocity is a vector quantity that includes both magnitude (speed) and direction. In this case, the negative velocity indicates that the baseball is moving in the opposite direction of a chosen positive reference direction. Acceleration, on the other hand, represents the rate of change of velocity and also includes both magnitude and direction.
When the velocity and acceleration have the same sign (both negative in this case), it means that the baseball is slowing down. This is because the acceleration is acting in the opposite direction to the velocity, which results in a decrease in speed. Therefore, the speed of the baseball is decreasing.