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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What is her useful power output : Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. What is her useful power output |

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