Answered: 5.0 m 3.0 m FIGURE P10.49

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Physics

5.0 m 3.0 m FIGURE P10.49

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter1: Getting Started

Section: Chapter Questions

Problem 19PQ

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Concept explainers

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

The 5.0-m-long rope shown hangs vertically from a tree right at the edge of a ravine. A woman wants to use the rope to swing to the other side of the ravine. She runs as fast as she can, grabs the rope, and swings out over the ravine.
a. As she swings, what energy conversion is taking place?
b. When she’s directly over the far edge of the ravine, how much higher is she than when she started?
c. Given your answers to parts a and b, how fast must she be running when she grabs the rope in order to swing all the way across the ravine?

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