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Unformatted text preview: e has length
m, he starts a distance
m below the tree, and
drops to a distance
m below the tree when the
vine is vertical. Thus,
m. The speed at this point is 4 (b) [6pt] What is the maximum force on Tarzan’s arms as he swings across the gorge, if his
mass is 78.0 kg?
The force diagram shows the two forces on Tarzan at his lowest point, where the tension
be maximum. The net force is responsible for the centripetal acceleration
so will Problem 5: [12pt] Water at a gauge pressure of 3.8 atm at street
level flows into an office building at a speed of 0.68 m/s through a
pipe 5.0 cm in diameter. The pipe tapers down to 2.8 cm in
diameter by the top floor, 18 m above, where the faucet has been
left open. Assume no branch pipes and ignore viscosity.
(a) [5pt] Find the flow speed of the water in the pipe on the top
floor, in m/s.
The equation of continuity implies that , so (b) [7pt] Find the pressure inside the pipe on the top floor. (Note: the pressure inside the pipe
is different from the pressure at the faucet, for which the diameter is not given.)
Bernoulli’s equation implies that Then Therefore, 5 Problem 6: [12 pt] An 85.0kg swimmer pushes off a 560 kg boat, initially at rest, with his feet
and acquires a speed of 1.50 m/s relative...
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This document was uploaded on 03/09/2014 for the course PHYS 221 at Ohio Northern University.
 Fall '12
 ScottYost
 Physics

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