A professional baseball pitcher throws a 100 g ball at 45 m/s. What is the monemtum of the ball?
4500 ((kg-m)/s)
45 ((kg-m)/s)
4.5 ((kg-m)/s)
0.45 ((kg-m)/s)
0.045 ((kg-m)/s)
2
A 15 gram model rocket exerts a force of 10 Newtons propelling the rocket upwards. The rocket initially starts from rest and the rocket motor burns for 1/10 of a second. What impulse does the rocket exert?
0.0147 N-s
1.0 N-s
1.5 N-s
100 N-s
150 N-s
3
In a soccer game a player throws the ball in to play from the side line. She throws it in using her hands over her head. the ball starts from rest. The ball has a force acting in it for 0.10 seconds. On the way down the ball hits a player in the head at the same height it was thrown from. It makes contact for 0.005 seconds and comes to a rest upon contact. Which impulse is greater?
The throw's impulse is greater.
The head impact's impulse is greater.
The 2 impulses are equal.
There is not enough information to answer the question.
4
A rocket weighing 0.3 Newtons exerts an upward thrusting force of 8 Newtons. The rocket motor fires for 0.16 seconds. Which impulse is greater during the rocket's engine firing, gravity's or the rocket motor's impulse?
The impulse of due to the weight is greater.
The impulse of the rocket's thrust is greater.
The two impulses are equal.
Not enough information is given to answer the question.
5
What is the velocity of car "B" after the collision? (Define motion to the right as being positive.)
-1 m/s
3 m/s
5 m/s
8 m/s
0 m/s
6
What is the impulse of car "A" during the collision? (Define motion to the right as being positive.)
-24,000 N-s
24,000 N-s
-8000 N-s
-48,000 N-s
7
A 1100 kg truck is traveling at 10 m/s while carrying a crate of mass 800 kg. Suddenly a flying saucer swoops down, removes the crate without jostling the truck and flies away. What is the velocity of the truck after the crate has been removed? (No clues are implied in the animation.)
The truck continues on at 10 m/s.
190/11 m/s
8/11 m/s
190/8 m/s
8
Two train cars collide as shown. After the collision, they lock together. What is the mass of train car "B?"
10,000 kg
15,000 kg
0 kg. Doesn't make sense, but its zero.
20,000 kg
9
A, 15 kg, sled is sleigh riding down a hill. After half a minute the dog is traveling 15 m/s. What is the dog's velocity at the 1 minute mark?
14.83 m/s
41 m/s
15.00 m/s
25.00 m/s
2/3 m/s
10
Which has the greatest impulse?
Throwing a ball with a velocity of 20 m/s when the ball is released.
Bouncing a ball off a wall such that it hits the wall at 20 m/s and bounces off in the opposite direction at 10 m/s.
Catching a ball whose velocity is 20 m/s when it first makes contact with the fielders glove.