7.62 A 60.0-kg skier starts from rest at the top of a ski slope 65.0 m high. (a) If frictional forces do -10.5 kJ of work on her as she descends, how fast is she going at the bottom of the slope? (b) Now moving horizontally, the skier crosses a patch of soft snow, where μ = 0.20. If the patch is 82.0 m wide and the aver- age force of air resistance on the skier is 160 N, how fast is she going after crossing the patch? (c) The skier hits a snowdrift and penetrates 2.5 m into it before coming to a stop. What is the aver- age force exerted on her by the snowdrift as it stops her?
7.62 A 60.0-kg skier starts from rest at the top of a ski slope 65.0 m high. (a) If frictional forces do -10.5 kJ of work on her as she descends, how fast is she going at the bottom of the slope? (b) Now moving horizontally, the skier crosses a patch of soft snow, where μ = 0.20. If the patch is 82.0 m wide and the aver- age force of air resistance on the skier is 160 N, how fast is she going after crossing the patch? (c) The skier hits a snowdrift and penetrates 2.5 m into it before coming to a stop. What is the aver- age force exerted on her by the snowdrift as it stops her?
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 81AP: Repeat the preceding problem, but this time, suppose that the work done by air resistance cannot be...
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Transcribed Image Text:7.62 ** A 60.0-kg skier starts from rest at the top of a ski slope
65.0 m high. (a) If frictional forces do -10.5 kJ of work on her as
she descends, how fast is she going at the bottom of the slope?
(b) Now moving horizontally, the skier crosses a patch of soft
snow, where μ = 0.20. If the patch is 82.0 m wide and the aver-
age force of air resistance on the skier is 160 N, how fast is she
going after crossing the patch? (c) The skier hits a snowdrift and
penetrates 2.5 m into it before coming to a stop. What is the aver-
age force exerted on her by the snowdrift as it stops her?
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