iPad F session masteringphysics.com ® Mastering Physics: HW cho7 (5) Conservatio
ID: 1298339 • Letter: I
Question
iPad F session masteringphysics.com ® Mastering Physics: HW cho7 (5) Conservation of energy I Work and Exercise 7.I Mastering Physics l of 5 Exercise 7.I n one day, a 85 kg) mountain climber ascends from the 156 m) evel on a vertical cliff to the top at 2320 rm m The next day, she descends from the top to the base of the cliff, which is at an elevation of 1340Mrm m Part A What is her change in gravitational potential energy on the first day? Arm J) Delta U Submit Give Up Part B What is her change in gravitational potential energy on the second day? Delta U Mrm J) Submit Give Up Continue Processing mat 0%Explanation / Answer
a)change in gravitational energy= final energy-final enegy
= mg*(Hf - Hi)
=85*9.81*(2320-1560)
=633726 J
b)
change in gravitational energy= final energy-final enegy
= mg*(Hf - Hi)
=85*9.81*(1340-2320)
=-817173 J
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