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Set 5, Due Fri, Mar 7, 2008 at 23:59
1.
1
. [1 point, 10 tries]
A 22.2 kg child is on a swing that hangs on the bottom of two 1.87 m long chains. What is the maximum
speed if she swings out to a 41.4° angle?
Answer:
3.03e+00 m/s
2.
2
. [1 point, 10 tries]
A package of mass 8.9 kg is released from rest at a warehouse loading dock and slides down a 6.8 m
high frictionless chute to a waiting truck. Unfortunately, the truck driver went on a break without having
removed the previous package, of mass 17.8 kg from the bottom of the chute. Suppose the packages
stuck together. What is their common velocity after collision?
Answer:
3.85e+00 m/s
3.
3
. [1 point, 10 tries]
A new event has been proposed for the Winter Olympics. An athlete will sprint 50.0 m, starting from
rest, then leap onto a 23.5 kg bobsled. The person and bobsled will then slide down a 40.0 m long ice
recovered ramp, sloped at α=25.0°, and into a spring with a carfully calibrated spring constant of
1573.0 N/m. The athlete who compresses the spring the farthest wins the gold medal. Jennifer, whose
mass is 53.0 kg, has been training for this event. She can reach a maximum speed of 14.2 m/s in the
50.0 m dash. How far will Jennifer compress the spring?
Answer:
4.56e+00 m
4.
4
. [1 point, 10 tries]
A 55.7 g ball of clay hits and sticks to a 2.35 kg block sitting at rest on a frictionless surface. What is the
speed of the block after the collision if the initial speed of the ball of clay is 4.91 m/s?
Answer:
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This note was uploaded on 07/23/2008 for the course SCIENCE PHYSICS 1B taught by Professor Hughes during the Winter '08 term at McMaster University.
 Winter '08
 HUGHES
 mechanics

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