Please write your homework neatly. Don't try to cram all the problems into the
minimum space. Show your work clearly, and useful diagrams are always appropriate
and may get extra points. You may work with others, but the work should be your
own. I expect numeric answers to have a reasonable number of significant figures
and proper units.
Note: WebAssign grades only on the answer; I will grade only (mostly) on the
method! Make your method clear.
1. A 14.2–Mg railroad boxcar with a speed of 1.8 m/s hits and couples
to a stationary 23.5–Mg flatcar on a straight and level track. (a) Describe
the conditions necessary to use conservation of momentum to estimate the speed
of the two–car system after the collision. What assumptions must be made?
(b) Use conservation of momentum to estimate this speed.
2. Cummings et al., Ch. 8, p. 224, Problem 43
3. Cummings et al., Ch. 9, p. 252, Problem 11
4. A box is seen at the top of a smooth (no friction) roller coaster track moving with a speed v0 = 6.0 m/s and at a height H = 1.5 m above the level stretch. The box slides down and on the horizontal stretch there is a coefficient of kinetic friction mu = 0.40. What is the distance that the box slides before it comes to rest? [Yes, all the information you need to solve this problem is given!]
This page maintained by Anne G. Young. Last modified 20-Oct-2004 .