A 15 gram model rocket exerts a force of 10 Newtons propelling the rocket upward

Question

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?

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?

What is the velocity of car "B" after the collision? (Define motion to the right as being positive.)

0 m/s

What is the impulse of car "A" during the collision? (Define motion to the right as being positive.)

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? (in m/s)

23

Which has the greatest impulse?

Tricky. All these have the same impulse.

The graph shows the force on an object of mass M as a function of time. For the time interval 0 to 4 s, the total change in the momentum of the object is?( in kg.m/s)

0

Which of the following are units of impulse?

kg/m*s

Two train cars collide as shown. After the collision, they lock together. What is the mass of train car "B?"( No units needed)

A professional baseball pitcher throws a 100 g ball at 45 m/s. What is the monemtum of the ball? 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BEFORE A VA= 8 ms VB= 1 ms 0 0 N 0 0 0 AFTER VA= 4 ms Vgs? Mu= 2000 kg Mg= 4000 kg CRUNCH MA= 2000 kg Mg= 4000 kg ON NO O O O N O O O O O O N N

Explanation / Answer

1)

P = MV= 4.5kgm/s

2)

impulse = J = F.t = 1Ns

3)

J = F.t

J rocket = 1.28Ns

W = mg = 2.94

J gravity = 0.4704Ns

so the impulse due to rocket thrust is greater

4)

by the law of conservation of momentum

PA + PB = P'A + P'B

MAVA + MBVB = M'AV'A + M'BV'B

V'B = 3m/s

5)

J = Ft = MV - Mu = M (V - u )= -8000NS

7)

change in moment = mV - Mu = impulse = F . t = 40

8)

N*s

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