A weightlifter curls a 35kg bar , raising it each time a distance of 0.50m. How

Question

A weightlifter curls a 35kg bar , raising it each time a distance of 0.50m.
How any times must he repeat this exercise to burn off the energy in one slice of pizza? Assume 25% efficiency.
Energy content of one slice of pizza is 1260 kJ A weightlifter curls a 35kg bar , raising it each time a distance of 0.50m.
How any times must he repeat this exercise to burn off the energy in one slice of pizza? Assume 25% efficiency.
Energy content of one slice of pizza is 1260 kJ
How any times must he repeat this exercise to burn off the energy in one slice of pizza? Assume 25% efficiency.
Energy content of one slice of pizza is 1260 kJ

Explanation / Answer

a slice of pizza has 1260x10^3 joules.

Multiply that by the efficiency 0.25 to get 315000joules that is available for mechanical work.

For each lift, the energy used is 35 x 9.8 x 0.5 joules = about 171.5 joules.

You divide 315000 by 171.5 . That should be about 1836

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