Problem 10.4 Part A An escalator carries you from one level to the next in an ai

Question

Problem 10.4 Part A An escalator carries you from one level to the next in an airport terminal. The upper level is 4.6 m above the lower level, and the length of the escalator is 7.6 m. Assume that your mass is 68 kg. How much work does the up escalator do on you when you ride it from the lower level to the upper level? Express your answer to two significant figures and include the appropriate units. W = Part B How much work does the down escalator do on you when you ride it from the upper level to the lower level? Express your answer to two significant figures and include the appropriate units. W =

Explanation / Answer

conservation of energy ,

PE = mgh

here h = displacement=4.6 m

==> PE= 69kg*9.8*4.6m=3110.52 J

Part A:

PE=3110.52 J

Part B:

PE= - 3110.52 J ( down displacement = -4.6m )

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