Question

The human body is only about 15% efficient when climbing the ladders
Calaculate the actual energy used from the body of the workman in (b) when he climbs 20 rungs

Answer 1

Answer:

GPE = mgh (Weight x Height)

Therefore each rung is worth GPE = 800N*0.30m = 240J

The amount of energy the workman uses in 5s is Power x time = 528*5 = 2640J

Now simply divide the total energy used by the workman by the GPE value of each rung

> 2640/240 = 11 rungs.

C) 20 rungs equates to 20*240J = 4800J

this is the energy required by the workman to climb 20 rungs, but since the human body is only 15% efficient this 4800J must be 15% of the total energy used by the body

Therefore the total energy is 4800/15 x 100 = 32000 = 32kJ

Explanation:

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