3. A 500 kg car and a 1000 kg truck are both moving at 5 m/s.
a. What is the ratio of their momentum and why?

The ratio of momentum is 1:2 since the velocity is constant and mass is of ratio 1:2

Explanation:

Given

mass of car = 500 kg

mass of truck = 1000 kg

velocity of car = velocity of truck = v = 5 m/s

momentum of car = ?

momentum of truck = ?

We know that the momentum is given by: p = mv , where m is mass and v is velocity.

momentum of car =  x v = 500 x 5 = 2500 kg.m/s

momentum of  truck =  x v = 1000 x 5 = 5000 kg.m/s

The ratio of momentum =

                                        =

                                        = = 1:2

Here we infer that the ratio is 1:2. This is because momentum value depends on mass and velocity of body. In given problem velocity is constant. Hence depends only on mass. The ratio of mass is 1:2 and so the ratio of momentum.

i guess it’s a and b

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.