Sapling Learning Map A weightlifter bench-presses a 160.0 kg barbell from his ch

Question

Sapling Learning Map A weightlifter bench-presses a 160.0 kg barbell from his chest to a height equal the length of his arms 0.750 m. How much work does he do? Number What is the potential energy of the barbell relative to the weightlifter's chest after he lifts the barbell? Number How many food calories does the weightifter use if he does this lift 35 times? Assume the weightifter does no work in letting the barbell drop back to his chest. Number Cal Previous ? Give Up & View Solution ? Check Answer O Next -el Exit Hint

Explanation / Answer

here,

mass of barbell , m = 160 kg

h = 0.75 m

the work done , W = m * g * h

W = 160 * 9.81 * 0.75 J = 1177.2 J

the potential energy of the barbell relaive to the weighlifter , PE = m * g * h

PE = 1177.2 J

the food calories used , C = N * W

C = 35 * 1177.2 * 0.239 cal

C = 9847.3 cal

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