Question

1 Rank the following in terms of increasing momentum:

A 10,000 kg train car at rest

A 100 kg person running at 5 m/s

A 1200 kg car going 15 m/s

A 15 kg meteor going at a speed of 1000 m/s

2 Rank the following in terms of increasing kinetic energy:

A 1200 kg car going 15 m/s

A 10,000 kg train car at rest

A 15 kg meteor going at a speed of 1000 m/s

A 100 kg person running at 5 m/s

3 Ben (55 kg) is standing on very slippery ice when Junior (25 kg) bumps into him. Junior was moving at a speed of 8 m/s before the collision and Ben and Junior embrace after the collision. Find the speed of Ben and Junior as they move across the ice after the collision. Give the answer in m/s. Describe the work you did to get the answer.  

Answer 1

To solve this problem you have to know about Momentum and kinectic energy

Step 1.

Definition:

Kinetic energy: Kinetic energy is an expression of the fact that a moving object can do work on whatever strikes ; quantifies the amount of work that the object might take as a result of their movement.

Momemtum: It refers to moving objects and is a vector quantity which plays an important role in Newton 's second law. The amount of movement combines the ideas of inertia and movement. It also follows a principle of conservation that has been used to discover many facts related to the basic particles of the universe. The law of conservation of momentum and the law of conservation of energy, are the most powerful tools of mechanics.

Step 2.

1).- Rank the following in terms of increasing momentum: They are ordered from the highest increase to less

The momentum is the product of mass and velocity:

a).- A 1200 kg car going 15 m/s

b).- A 15 kg meteor going at a speed of 1000 m/s

c).- A 100 kg person running at 5 m/s

d).- A 10,000 kg train car at rest

2).- Rank the following in terms of increasing kinetic energy: They are ordered from the highest increase to less

The kinetic energy is the product of one half, by the mass by velocity squared:

a).- A 15 kg meteor going at a speed of 1000 m/s

b).- A 1200 kg car going 15 m/s

c).- A 100 kg person running at 5 m/s

d).- A 10,000 kg train car at rest

3).-

To solve this problem you need apply the momentum conservation, say's the following: the momentum before motion is equal at the momentum after motion

Ben was at rest before th collision and junior has a velocity of 8 m/s, later the collision ben and junior ambrace their masses are added

  replace the values

If you have any question please let me know in the comments