A champion weight lifter raises a 240 kg barbell a distance of 2.1 m. How much potential energy has the barbell gained?

Your answer is below …….

Explanation:

25. Brutus, a champion weightlifter, raises

240 kg of weights a distance of 2.35 m.

a. How much work is done by Brutus

lifting the weights?

W=Fd=mgd

= (240 kg)(9.80 m/s2)(2.35 m)

= 5.5 x 103j

b. How much work is done by Brutus

holding the weights above his head?

d=0, so no work

c. How much work is done by Brutus

lowering them back to the ground?

d is opposite of motion in part a, so

W is also the opposite, -5.5 x 103 J.

d. Does Brutus do work if he lets go of

the weights and they fall back to the

ground?

No. He exerts no force, so he does

no work, positive or negative.

If Brutus completes the lift in 2.5 s.

how much power is developed?

* = multiply

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