Physics, 03.08.2019 15:30 jazmineweb234

Arailroad car of mass m is moving at speed v when it collides with a second railroad car of mass m which is at rest. the two cars lock together instantaneously and move along the track. what is the speed of the cars immediately after the collision?

Answers: 1

Show answers

Answers

v/2 This is an exercise in the conservation of momentum. The collision specified is a non-elastic collision since the railroad cars didn't bounce away from each other. For the equations, I'll use the following variables. r1 = momentum of railroad car 1 r2 = momentum of railroad car 2 x = velocity after collision Prior to the collision, the momentum of the system was r1 + r2 mv + m*0 So the total momentum is mv After the collision, both cars move at the same velocity since it was non-elastic, so r1 + r2 mx + mx x(m + m) x(2m) And since the momentum has to match, we can set the equations equal to each other, so: x(2m) = mv x(2) = v x = v/2 Therefore the speed immediately after collision was v/2

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

Independent variable is something that is changed in a experiment.

Other questions on the subject: Physics

Physics, 21.06.2019 23:20, nathalyviruete

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

Answers: 1

continue

Physics, 22.06.2019 07:30, elijahjacksonrp6z2o7

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Answers: 1

continue

Physics, 22.06.2019 11:50, morenodonaldo762

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Answers: 1

continue

Physics, 22.06.2019 20:10, JayLiz1737

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)

Answers: 1

continue

You know the right answer?

Arailroad car of mass m is moving at speed v when it collides with a second railroad car of mass m w...