Simple Physics Questions?

Question

The 3.8 x 10^7 kg Battleship North Carolina moving at 12.9 m/s and the 2.72 x 10^7 kg aircraft carrier Intrepid, have the same momentum. How fast is the Intrepid moving? 

 

How long would a 35 N force have to be applied to a .20 kg golf ball to change its velocity from 0 m/s to 45 m/s?

 

 

 

A.55 kg baseball approaches the batter at 35 m/s and leaves his bat at 45 m/s in the opposite direction. The bat and ball are in contact for .45 ms. What force is applied to the ball?

 

 

 

A 25.8 kg train car is rolling south on a track at 18.9 m/s, then strikes a 30.5 kg car rolling north at 1.9m/s. The two cars then couple and move off.

 

 

a) What is the momentum of the train after they couple?

 

 

 

b) What is the velocity of the coupled cars?

Answer 1

Hello!

The first and fourth questions you list have to do with momentum. Leverage the momentum equation to solve these. (Hint for the fourth one: Think about how the train cars masses interact after coupling).

The second and third questions have to do with Impulse. As long as you know the formula for Impulse, you should be able to do some algebraic manipulation to solve for the variable you're looking for.

Hope that helps!