s to the top of a 3600-m-high mountain. The climb is made in 6.0 h starting at an elevation of 2200 m. Calculate (a) the work done by the hiker against gravity, (b) the average power output in watts, and (c) assuming the body is 15% efficient, what rate of energy input was required.

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter8: Potential Energy And Conservation Of Energy
Section: Chapter Questions
Problem 8.3CYU: Check Your Understanding When the length of the spring in Example 8.3 changes from an initial value...
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A 60-kg hiker climbs to the top of a 3600-m-high mountain. The climb is made in 6.0 h starting at
an elevation of 2200 m. Calculate (a) the work done by the hiker against gravity, (b) the average power
output in watts, and (c) assuming the body is 15% efficient, what rate of energy input was required.

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