A weightlifter works out at the gym each day. Part of her routine is to lie on h

Question

A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 45 kgbarbell straight up from chest height to full arm extension, a distance of 0.52 m . I ONLY NEED ANSWER AND WORK TO PART C.

A. How much work does the weightlifter do to lift the barbell one time? ANSWER IS 230 J

B. If the weightlifter does 25 repetitions a day, what total energy does she expend on lifting, assuming a typical efficiency for energy use by the body (25%). ANSWER IS 2.3 X 10^4 J

C. How many 430 Calorie donuts can she eat a day to supply that energy? THIS IS WHAT I NEED

Explanation / Answer

Let the no. of Donuts = N

Therefore

N*Energy in one Donut = Energy required

N*430*4184 = 2.3*10^4

N = 0.01278

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