1. -/5 pointsOSColPhysl 8.1.001.
(a) Calculate the momentum of a 1900 kg elephant charging a hunter ata speed of
1 1 kg·m/s
(b) Compare the elephant's momentum with that of a 0.0400 kg bullet fired ata speed
of 600 m/s.
1 l (momentum of elephant / momentum of bullet)
(c) What is the momentum of the 90.0 kg hunter running at 7.00 m/s after missing the
..__ __ ~Ik g·m/s
2. -/5 pointsOSColPhysl 8.2.012.
One hazard of space travel is debris left by previous missions. There are several
thousand masses large enough to detect by radar orbiting the earth, but there are far
greater numbers of very small masses such as flakes of paint. Calculate the force
exerted by a 0.170 mg chip of paint that strikes a space shuttle window ata relative
speed of 3.00 x 103 m/s and sticks, given the collision lasts 6.00 x 10-8 s. Such a
collision chipped the window of the ill-fated Challenger in June 1983, causing $50,000 of
3. -/5 pointsOSColPhysl 8.2.018.
A 0.600 kg hammer is moving horizontally at 4.50 m/s when it strikes a nail and comes
to rest after driving it 1.00 cm into a board.
(a) Calculate the duration of the impact.
1 1 s
(b) What was the average force exerted on the nail?
1 IN(d ownwa~)
4. -/5 pointsOSColPhysl 8.3.023 .
Train cars are coupled together by being bumped into one another. Suppose two loaded
train cars are moving toward one another, the first having a mass of 150,000 kg and a
velocity of 0.300 m/s, and the second having a mass of 105,000 kg anda velocity of
-0.120 m/s. (The minus indicates direction of motion.) What is their final velocity?
1 1 m/s
5. -/5 pointsOSColPhysl 8.4.029 .
Two manned satellites approaching one another ata relative speed of 0.500 m/s intend
to dock. The first has a mass of 2.50 x 103 kg, and the second a mass of 7.50 x 103
kg. If the two satellites collide elastically rather than dock, what is their final relative
velocity? Adopt the reference frame in which the second satellite is initially at rest and
assume that the positive direction is directed from the second satellite towards the first
._______ ___m,I/ s
6. -/5 pointsOSColPhys1 8.4.059.XP.
A 0.0220 kg bullet moving horizontally at 400 m/s embeds itself into an initially
stationary 0.500 kg block.
(a) What is their velocity just after the collision?
1 1 m/s
(b) The bullet-embedded block slides B.O m on a horizontal surface with a
0.30 kinetic coefficient of friction. Now what is its velocity?
1 1 m/s
(c) The bullet-embedded block now strikes and sticks to a stationary 2.00
kg block. How far does this combination travel befare stopping?
7. -/5 pointsOSColPhysl 8.5.035 .
Two manned satellites approaching one another ata relative speed of 0.300 m/s intend
to dock. The first has a mass of 4.00 x 103 kg, and the second a mass of 7.50 x 103
kg. Assume that the positive direction is directed from the second satellite towards the
(a) Calculate the final velocity after docking, in the frame of reference in
which the first satellite was originally at rest.
1 1 m/s
(b) What is the loss of kinetic energy in this inelastic collision?
1 1 J
(e) Repeat both parts, in the frame of reference in which the second
satellite was originally at rest.
1 1 m/s
loss of kinetic energy
1 1 J
Explain why the change in velocity is different in the two frames, whereas
the change in kinetic energy is the same in both. (Do this on paper. Your
instructor may ask you to turn in this work.)
8. -/5 pointsOSColPhysl 8.6.050 .
Two cars collide atan icy intersection and stick together afterward. The first car has a
mass of 1300 kg and was approaching at 5.00 m/s due south. The second car has a
mass of 850 kg and was approaching at 25.0 m/s due west.
(a) Calculate the final velocity of the cars. (Note that since both cars have
an initial velocity, you cannot use the equations for conservation of
momentum along the x-axis and y-axis; instead, you must look for other
simplifying aspects .. )
l._____ _,I m/s
,.._ _ ___ _.I. Áº (counterclockwise from west is positive)
(b) How much kinetic energy is lost in the collision? (This energy goes into
deformation of the cars.)
1 1 J
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