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.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.