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lolbob07
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Just want to make sure If I have solved this question correctly.
A 75 kg person walks to the top of a 240 m high hill expending 5.6 x 10^5 J of energy/
a. What was the potential energy of the person at the top of the hill?
b. What is the efficiency of the person in walking up the hill?
Not sure what to write here??
Solution to a.
GPE = mgh. M = 75, G = 9.8 m/s, H = 240. ∴ 75 x 9.8 x 240 = 176400 J
Solution to b.
Efficiency = Energy out / Energy in x 100%. ∴ 176400 / 560000 x 100% = 31.5
Is this correct? I am not quite sure...
Thanks
Homework Statement
A 75 kg person walks to the top of a 240 m high hill expending 5.6 x 10^5 J of energy/
a. What was the potential energy of the person at the top of the hill?
b. What is the efficiency of the person in walking up the hill?
Homework Equations
Not sure what to write here??
The Attempt at a Solution
Solution to a.
GPE = mgh. M = 75, G = 9.8 m/s, H = 240. ∴ 75 x 9.8 x 240 = 176400 J
Solution to b.
Efficiency = Energy out / Energy in x 100%. ∴ 176400 / 560000 x 100% = 31.5
Is this correct? I am not quite sure...
Thanks
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