1) If there is no torque on an object, its angular momentum
is _____________.
2) Angular momentum is the product of mass, velocity,
and ____________.
3) A 4 kg gun fires a 0.002 kg bullet at 2000 m/s. What
is the recoil velocity of the gun? _____
4) In a closed system, the total momentum before ___________
the total momentum after.
5) Two different size masses are moving at the same speed.
Which has the larger momentum - the larger mass or the smaller mass?
_________________
6) How long does it take a net upward force of 187.5 N
acting on a 50 kg rocket to
increase its speed from 25 m/sec to 75m/sec?
t = ____
7) A 120 kg person runs at 4 m/s and jumps on a 50 kg
wagon that is sitting still.
How fast does the person/wagon go afterwards?
Vafter = ____
8) What is the momentum of a 140 kg person running at
4 m/sec?
P = ____
9) A 0.2 kg bullet has a momentum of 172 kg*m/sec.
How fast is it moving? v = ____
10) A toy railroad engine [A] at rest (with a mass of
1 kg) is hit by another engine [B] (with a mass of 2 kg) moving at a speed
of 3 m/sec. On colliding the two engines lock and remain together.
a) What is the momentum
of each engine before the collision?
PAbefore
= ____ PBbefore
= ____
b) What is the total momentum
before the collision?
PTotalbefore = ____
c) What is momentum of
both engines after the collision?
PABafter = ____
d) What is the velocity
of the pair of engines after the collision?
VABafter = ____
11) What braking force is needed to bring a car having
a mass of 8000 kg and
moving at 20 m/sec to a stop 10 sec. after the
brake is applied?
F = ____
12) Two 2044 kg blocks, each at a speed of 8209.3302
m/s, collide into each other from opposite
directions. What is the
total momentum after? Explain and justify your answer.
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