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Physics, 07.12.2019 04:31 Mepps9949

Aweightlifter works out at the gym each day. part of her routine is to lie on her back and lift a 41kg barbell straight up from chest height to full arm extension, a distance of 0.45m . part a: how much work does the weightlifter do to lift the barbell one time? part b: if the weightlifter does 23 repetitions a day, what total energy does she expend on lifting, assuming a typical efficiency for energy use by the body? part c: how many 500 calorie donuts can she eat a day to supply that energy?

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