Fig. 1
Physics 171.101
First Exam
Oct. 11, 2005
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Begin with problems that look most familiar.
If you get stuck,
skip to the next problem.
1.
(10 pts) A block of mass
m
=2.0 kg is dropped from height
h
=50cm onto a spring of
spring constant
k
= 2000 N/m, as shown in Fig. 1. Find the maximum distance the
spring is compressed.
2.
(12 pts) An elevator cab that weighs 27.8 kN moves upward. What is the tension in
the cable if the cab's speed is (a) increasing at a rate of 1.22 m/s
2
and (b) decreasing at
a rate of 1.22 m/s
2
?
3.
12 pts) A helicopter lifts a 60 kg astronaut 20 m vertically from the ocean by means
of a cable. The acceleration of the astronaut is g/5. How much work is done on the
astronaut by (a) the force from the helicopter and (b) the gravitational force on her?
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 Fall '05
 FORD
 Physics, Cartesian Coordinate System, Force, pts, Polar coordinate system, Standard basis

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