what is a frame of reference? how is it used to measure motion? ​

The average speed of the car is 35.6m/s

The average speed is the total distance traveled by the object in a particular time interval. The average speed is a scalar quantity. It is represented by the magnitude and does not have direction. It is measured in meter per second

Therefore average speed = total distance / total time taken

The total distance here is 500+ 500= 1000km = 1×10⁶m

the time taken for the first journey = 500×1000/35= 14285.71 seconds

the time taken for traveling back = 500000/43= 11627.91 seconds

total time taken = 14285.71 + 11627.91 = 25913.62seconds

therefore average speed = 1000000/25913.62

= 35.6m/s

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Answer:

a person appears at a specified time and place and gives sworn testimony

Explanation:

Hope this helps

The speed of the edge of a fidget spinner that has a diameter of 6.0 cm is 12.58 m/s.

To calculate the speed of the edge of the fidget spinner, we need to convert the rotational speed from revolutions per minute to radians per second, and then multiply by the radius of the spinner.

First, we convert 4000 rpm to radians per second:

4000 rpm = 4000 revolutions / 60 seconds = 66.67 revolutions per second

Each revolution is 2π radians, so:

66.67 revolutions per second = 66.67 * 2π radians per second = 419.47 radians per second

Now that we have the rotational speed in radians per second, we can calculate the speed of the edge of the fidget spinner:

speed = rotational speed x radius

The radius of the fidget spinner is half of its diameter, which is 6.0 cm / 2 = 3.0 cm = 0.03 m.

So, the speed of the edge of the fidget spinner is:

speed = 419.47 radians per second x 0.03 m = 12.58 m/s

Therefore, the speed of the edge of the fidget spinner is approximately 12.58 m/s.

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Answer:

At the bottom    h = 0   for pendulum

at the top           h = L - L cos 50     height to which pendulum raised

   h = L (1 - cos 50) = 1.2 * .357 = .429 m

potential energy = m g h

PE = .8 kg * 9.8 m/s^2 * .429 m = 3.4 J

If a  frictionless pendulum has a length of 1.2 m and a mass of 0.8 kg. If the pendulum is raised to an angle of 50 degrees before it is released, then the pendulum’s gravitational potential energy at the point of release would be 3.4 Joules, therefore the correct answer is option A.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.

As given in the problem if a frictionless pendulum has a length of 1.2 m and a mass of 0.8 kg. If the pendulum is raised to an angle of 50 degrees before it is released,

At the top height to which the pendulum was raised,

Height  = L (1 - cos 50) = 1.2 * 0.357 =0 .43 m

The potential energy = m× g ×h

The gravitational potential energy =0.8 * 9.8  * 0.429 m = 3.4 Joules

Thus, the pendulum’s gravitational potential energy at the point of release would be 3.4 Joules, therefore the correct answer is option A.

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#1

#2

No it happens opposite as heat transfers from high to low

#3

#4

No it can't be happened in vaccum

#5

#6

Faster the movement faster the heat transfer

#7

Light particles get transferred from low to high (sun light)

#8

#9

Answer:

Below:

Explanation:

The most common method used by the USGS for measuring velocity is with a current meter. However, a variety of advanced equipment can also be used to sense stage and measure streamflow. In the simplest method, a current meter turns with the flow of the river or stream.

Hope it helps...

It's Ms-Muska

Answer:

When vectors are added or subtracted, the net force is called the resultant force.

Explanation:

Hope i helped, have a nice day/night

Answer:

vaporation

Explanation:

latent heat also called the heat of vaporization is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure.

Answer:

Less than 50N

Explanation:

Given that a pair of wires holding a hanging light that weighs 50N.

Since the hanging weight is equal to 50 N, the sum of the tension in the wires will also experience the same magnitude of force acting on the weight.

Considering each of the wire, the tension on each of the wire will surely be less than 50N

Therefore, the tension in each wire is less than 50N

The moon remains in orbit around earth because of gravitational energy

Data;

Moon and other centripetal bodies maintain a state of constant orbit or centripetal acceleration because of gravitational energy.

The gravitational energy acting on the moon keeps the body rotating. This is further elaborated by Einstein's theory of relativity.

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The steam engine moves a piston back and forth inside a cylinder using the force created by the pressure of the steam. A connecting rod and crank can convert this pushing force into a rotational force for wo

Because electric and diesel locomotives are faster, more effective, and simpler to operate, steam locomotives are no longer utilized to transport people or goods. The locomotives that are still in operation are historical artifacts from the 1800s that serve as a great reminder of how far we've come.

Simply explained, steam engines generate heat energy by boiling water and producing steam using fire and coal (chemical energy). This heat energy is then used to push the cylinder and piston, which in turn moves the wheels (kinetic).

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Answer:

What is 250 °C in °F?

482

Fahrenheit = (1.8 times Celsius) + 32 .

No matter WHAT Celsius temperature you start with, you put it into that formula in place of the word "Celsius", and the formula gives you the Fahrenheit temperature.

It works for ANY Celsius temperature. So now, you never have to ask this question again.  

After the collision, the momentum of the two-mass system must be conserved. The momentum of the system before the collision is equal to the momentum of the system after the collision. Therefore, the momentum of the two-mass system before the collision is equal to the momentum of the two-mass system after the collision.

Before the collision, the momentum of mass A is 8 kg m/s (10 kg times 8 m/s). The momentum of mass B before the collision is -12 kg m/s (30 kg times -4 m/s). Therefore, the total momentum of the two-mass system before the collision is equal to 8 - 12 = -4 kg m/s.

After the collision, the momentum of the two-mass system must also equal -4 kg m/s. Since mass A has a mass of 10 kg and mass B has a mass of 30 kg, we can set up the following equation:

10vA + 30vB = -4 kg m/s

Solving this equation for vB gives us the following expression:

vB = (-4 kg m/s - 10vA) / 30

We can substitute the initial velocity of mass A, 8 m/s, into this equation to get the final velocity of mass B:

vB = (-4 kg m/s - 10(8 m/s)) / 30

vB = -6 m/s

Since momentum must be conserved, the final velocity of mass A must be equal to the total momentum of the system (minus the momentum of mass B) divided by the mass of mass A. This gives us the following expression:

vA = (-4 kg m/s + 30(-6 m/s)) / 10

vA = 2 m/s

Therefore, the final velocity of mass A is 2 m/s and the final velocity of mass B is -6 m/s.

The change in momentum of mass A is equal to the initial momentum of mass A minus the final momentum of mass A.

The initial momentum of mass A before the collision is 8 kg m/s (10 kg times 8 m/s). The final momentum of mass A after the collision is 2 kg m/s (10 kg times 2 m/s). Therefore, the change in momentum of mass A is equal to 8 - 2 = 6 kg m/s.

The change in momentum of mass B is equal to the initial momentum of mass B minus the final momentum of mass B.

The initial momentum of mass B before the collision is -12 kg m/s (30 kg times -4 m/s). The final momentum of mass B after the collision is 6 kg m/s (30 kg times -6 m/s). Therefore, the change in momentum of mass B is equal to -12 - 6 = -18 kg m/s.

The impulse experienced by mass A is equal to the change in momentum of mass A divided by the time during which that change occurs. Since the change in momentum of mass A is 6 kg m/s and the time of the collision is likely instantaneous, the impulse experienced by mass A is 6 kg m/s.

The net force on mass A is equal to the impulse experienced by mass A divided by the time of the collision. Since the impulse experienced by mass A is 6 kg m/s and the time of the collision is 0.06 seconds, the net force on mass A is equal to 6 kg m/s / 0.06 s = 100 N.

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Answer:

5.33 w

Explanation:

parallel resistors equivalent r  =  r1 r2 /(r1+r2) = 2 ohm

in series with 4 ohm resistor makes total r = 6 ohms

    12 v / 6 ohm = 2 amps current

2/3 of the current will go through the 3 resistor

   2/3 * 2 = 4/3 amp

power = I^2 R =  4/3 ^2 * 3 = 5.33 watts

The mass of the object if the acceleration of a mass is 15 m/s^2 to the left is 1.27 kg

F = F1 + F2 + F3

F1 = - 8 N

F2 = 7 N

F3 = - 18 N

F = - 8 + 7 - 18

F = - 19 N

Negative symbol indicates that the force is acting towards the left.

F = m a

F = Force

m = Mass

a = Acceleration

a = - 15 m / s²

m = F / a

m = - 19 / - 15

m = 1.27 kg

Therefore, the mass of the object is 1.27 kg

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There are 1,048,576 possible outcomes (microstates) when flipping 20 fair coins. The probability of getting the sequence "HTHHTTTHTHHHTHHHHTHT" in exactly that order is approximately 9.5367e-07.

a) There are 2 possible outcomes (heads or tails) for each coin flip, and since there are 20 coin flips, the total number of possible outcomes, or microstates, is given by 2²⁰

Answer: 2²⁰= 1,048,576 possible outcomes.

b) To calculate the probability of getting the sequence "HTHHTTTHTHHHTHHHHTHT" in exactly that order, we need to determine the probability of obtaining each individual outcome (head or tail) and multiply them together.

Since each coin flip is independent and has a 1/2 chance of resulting in either heads or tails (assuming the coins are fair), the probability of obtaining the desired sequence is (1/2)²⁰

Answer: (1/2)²⁰≈ 9.5367e-07

c) To calculate the probability of getting exactly 12 heads and 8 tails in any order, we need to determine the number of ways to arrange 12 heads and 8 tails within the 20 coin flips.

This can be calculated using the binomial coefficient, also known as "n choose k." The formula for the binomial coefficient is:

C(n, k) = n! / (k! * (n-k)!)

Where n is the total number of coin flips and k is the number of heads.

Using this formula, the probability can be calculated as follows:

P(12 heads and 8 tails) = C(20, 12) * (1/2)^20

Calculating C(20, 12):

C(20, 12) = 20! / (12! * (20-12)!)

          = 20! / (12! * 8!)

          = (20 * 19 * 18 * 17 * 16 * 15 * 14 * 13) / (8 * 7 * 6 * 5 * 4 * 3 * 2 * 1)

          = 125,970

P(12 heads and 8 tails) = 125,970 * (1/2)^20

Answer: P(12 heads and 8 tails) ≈ 0.12013435364 (approximately)

a) There are 1,048,576 possible outcomes (microstates) when flipping 20 fair coins.

b) The probability of getting the sequence "HTHHTTTHTHHHTHHHHTHT" in exactly that order is approximately 9.5367e-07.

c) The probability of getting exactly 12 heads and 8 tails in any order is approximately 0.12013435364.

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The magnitude of the electric field between the plates is approximately 126050 N/C.  The magnitude of the force on an electron between the plates is approximately 2.02 × 10^(-14) N.  The amount of work that must be done on the electron to move it to the negative plate is approximately 5.78 × 10^(-17) J.

(a) The magnitude of the electric field between the plates can be calculated using the formula: Electric Field = Voltage / Distance. Given that the potential difference is 600 V and the distance between the plates is 4.76 mm (which is 0.00476 m), we can substitute these values into the formula:

Electric field = 600 V / 0.00476 m

Electric Field ≈ 126050 N/C

Therefore, the magnitude of the electric field between the plates is approximately 126050 N/C.

(b) The magnitude of the force on an electron between the plates can be calculated using the formula: Force = Charge × Electric Field. Since the electron has a charge of -1.6 × 10^(-19) C and the electric field is given as 126050 N/C, we can substitute these values into the formula:

Force = (-1.6 × 10^(-19) C) × (126050 N/C)

Force ≈ -2.02 × 10^(-14) N

The negative sign indicates that the force is acting in the opposite direction of the electric field.

Therefore, the magnitude of the force on an electron between the plates is approximately 2.02 × 10^(-14) N.

(c) The work done on the electron to move it to the negative plate can be calculated using the formula: Work = Force × Distance. Given that the force is approximately -2.02 × 10^(-14) N and the initial distance from the positive plate is 2.86 mm (which is 0.00286 m), we can substitute these values into the formula:

Work = (-2.02 × 10^(-14) N) × (0.00286 m)

Work ≈ -5.78 × 10^(-17) J

The negative sign indicates that work is done against the electric field.

Therefore, the amount of work that must be done on the electron to move it to the negative plate is approximately 5.78 × 10^(-17) J.

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"The organelle found in plant cells which is responsible for converting sunlight energy into the chemical energy found in sugar molecules is chloroplast."

The conversion of solar energy into chemical energy through the synthesis of sugar molecules is known as photosynthesis. Only those creatures that have the specific organelle where this procedure takes place experience this process.

Photosynthesis is the process by which solar energy is converted into chemical energy for growth and is an organelle present in the cells of plants and some algae.

The presence of chlorophyll in this double-membrane organelle allows it to absorb solar energy. The chloroplast also has the enzymes required to create sugar molecules using light energy.

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the correct answer is: You must increase the track height by a factor of 4. The roller coaster's kinetic energy at the bottom of the track is provided by: \(K1 = (1/2) * m * v0^2\) where m is the roller coaster's mass and v0 is its velocity at the bottom.

The roller coaster's velocity would be v = 2v0 if we wanted it to go twice as fast at the bottom. At this increased velocity, the roller coaster's kinetic energy at the bottom would be\(: K2 = (1/2) * m * (2v0)^2 = 2 * K1\) To obtain this increased kinetic energy, we must raise the roller coaster's potential energy. The roller coaster's potential energy at the top of the track is given by: U1 = m * g *  where g denotes gravity's acceleration and h is the height of the track. To double the speed of the roller coaster, we need to double its kinetic energy, which means we need to double its potential energy.

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Answer:

A screw

Explanation:

The threads of a screw act like an inclined plane to increase the distance over which you exert the input force.

Answer:

Explanation:

Work = Force*Distance

300 = 84*d

d = 3.57 meters

The acceleration of the bus that turns a corner going 20 m/sec and begins to drive down the street for 15 seconds is 1.33m/s².

Acceleration in physics refers to the amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).

The acceleration of a body can be calculated by dividing the change in velocity of the moving body by the time taken as follows:

Acceleration = (v - u)/t

According to this question, a bus turns a corner going 20 m/sec and begins to drive down the street for 15 seconds.

Acceleration = (20 - 0)/15

Acceleration = 1.33m/s²

Therefore, 1.3m/s² is the acceleration of the bus that moves around the corner for 15 seconds.

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Answer:

Losing weight?

Explanation:

That would make sense because thats the only thing mentioned

Answer:

He started getting a full night of restful sleep.

Explanation:

hope 04.01 quizlet

The time it takes one to move from one place to another daily, can be used to quantify motion. Speed is used to quantify how fast an object moves.

What is motion?

This is the displacement with time of the position or orientation of a body. The displacement can be along a straight line or a curve.

Hence from the definition of motion, we can see that motion is dependent on time. We quantify motion by measuring the distance and dividing it by the time taken to move.

Speed measures how fast an object is moving through a distance, and it is calculated using this formula:

S= Δd/ Δt,

where S stands for speed,

d stands for distance, and

t stands for time.

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The push magnitude and the tension of the cord is 5.4 × 10^-4

What is cord ?

cord is the slender flexible material usually consisting of several stands or twisted together.

It is wired coverd in rubber or plastic which connects electrical equipment to an electricity supply.

The free body diagram as per the question with the tension of string T .

The force of gravity ~mg

The force of air ~f

Since the sphere is motionless the net force on it is 0.

And the x and y are the components of the equation are zero

Tsin + 0 = F

Tcos - mg= 0

Where ¥ = 32°

Thus we get

T= (3.9×10^-4 kg ) (9.8m/s^2)/cos32°

= 2.1×3.2×10^-4

Solving T

We can get the F =

(3.2×10^-4)sin 32° =

5.4 ×10^-4

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\( \huge \mathsf \blue{Question}\)

Explain why "selectively permeable" is a good way to describe a cell membrane.

\( \huge \mathsf \blue {Answer}\)

The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. Not all molecules are free to diffuse. If plasma membrane ruptures or breaks down then molecules of some substances will freely move in and out of the cells.

As the plasma membrane acts as a mechanical barrier, the exchange of material from its surroundings through osmosis or diffusion in a cell won’t take place. Consequently, the cell would die due to the disappearance of the protoplasmic material. It allows hydrophobic molecules and small polar molecules diffuse through the lipid layer, but does not allow ions and large polar molecules cannot diffuse through the membrane.

Answer:

The thermal efficiency, \(\eta _{reheat}\), of the Rankine cycle with reheat is 36.81%

Explanation:

p₁ = 8 MPa = 80 Bars

T₁ = 450°C = 723.15 K

From steam tables, we have;

v₁ = 0.0381970 m³/kg

h₁ = 3273.23 kJ/kg

s₁ = 6.5577 kJ/(kg·K) = s₂

The p₂ = 0.8 MPa

T₂ = Saturation temperature at 0.8 MPa = 170.414°C = 443.564 K

h₂ = 2768.30 kJ/kg

\(T_{2'}\) = 400°C = 673.15 K

\(h_{2'}\) = at 400°C and 0.8 MPa = 3480.6 kJ/kg

p₃ = 10 kPa = 0.1 Bar

T₃ = Saturation temperature at 10 kPa = 45.805 °C = 318.955 K

h₃ = 2583.89 kJ/kg

h₄ = \(h_{3f}\) = 191.812 kJ/kg

The thermal efficiency, \(\eta _{reheat}\), of a Rankine cycle with reheat is given as follows;

\(\eta _{reheat} = \dfrac{\left (h_{1}-h_{2} \right )+\left (h_{2'}-h_{3} \right )-W_{p}}{h_{1}-\left (h_{4}+W_{p} \right )+\left (h_{2'}-h_{2} \right )}\)

Therefore, we have;

\(\eta _{reheat} = \dfrac{(3273.23 -2768.30 ) + (3480.6 -2583.89 ) - 8.04)}{(3273.23 -(191.812 + 8.04) + (3480.6 -2768.30 ) } = 0.3681\)

Which in percentage is 36.81%.

The gauge pressure of the air inside the piston cylinder is 21.849 kPa if the atmospheric pressure is measured to be 102.3 kpa .

The pressure relative to atmospheric pressure is known as gauge pressure. Gauge pressure is positive for pressures greater than atmospheric pressure and negative for pressures less than atmospheric pressure. In fact, atmospheric pressure increases the pressure in any fluid that is not contained in a rigid container. This occurs as a result of Pascal's principle.

Absolute pressure on piston = atmospheric pressure +  pressure on  piston

solving , 102.3 kPa

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The gauge pressure of the piston cylinder will be 17889.5 KPa and the absolute pressure of the piston cylinder will be 17991.8 KPa.

The gauge pressure inside the piston cylinder is calculated by subtracting the atmospheric pressure from the total pressure inside the cylinder. Therefore, the gauge pressure of the air inside the piston cylinder is calculated as follows:

Pgauge = Ptotal - Patm
Pgauge = F/A - Patm
Pgauge = (20.4kg × 9.8m/s²) / 0.011m² - 102.3 kPa
Pgauge = 17991.8 kPa - 102.3 kPa
Pgauge = 17889.5 kPa


The absolute pressure inside the piston cylinder is the sum of the atmospheric pressure and the gauge pressure. Therefore, the absolute pressure of the air inside the piston cylinder is calculated as follows:

Pabsolute = Pgauge + Patm
Pabsolute = 17889.5 kPa + 102.3 kPa
Pabsolute = 17991.8 kPa

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