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Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 700 W. (The efficiency of a person shoveling is 3%.)
(a) What is her useful power output?
W
(b) How long will it take her to lift 3000 kg of snow 1.20 m? (This could be the amount of heavy snow on 60.0 ft of sidewalk.)
s
(c) How much waste heat will she generate in the process?
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The velocity of the bal
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