Hello, I cant seem to see what I am doing wrong on this question. Can I receive

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Hello, I cant seem to see what I am doing wrong on this question. Can I receive the answer and some feedback?

Thank you!

Problem 11.13- Enhanced- with Feedback Part A A weightlifter curls a 32 kg bar, raising it each time a distance of 0.50 m Ho many times must he repeat this exercise to bum off the energy in one slice of pizza, Assume 25% efficiency. Energy content of one slice of pizza s 1260 Express your answer using two significant tigures. You may want to reviow (Paggs 323-327 Submit Provide Feedback

Explanation / Answer

Energy in one slice of pizza = 1260 kJ

Efficiency = 25%

Total energy that needs to be burned = Energy in one slice*efficiency

Total energy = 1260*0.25 = 315 kJ

Now Potential energy is given by:

PE = m*g*h

Suppose he needs to repeat this exercise n times, then

TE = n*PE

TE = n*m*g*h

n = TE/mgh

n = 315*10^3/(32*9.81*0.50)

n = 2006.88 = 2.0*10^3 times

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