Question

A man gets 100 k.cal of heat energy by eating a piece of bread His efficiency is 28 percent and mass is 60 kg . How high can he rise after eating the bread

Answer 1

Answer on question #64337, Physics / Mechanics

Question A man gets 100 k.cal of heat energy by eating a piece of bread His efficiency is 28 percent and mass is 60 kg . How high can he rise after eating the bread

Solution Lets trasform calories into jouls:

$$E = 100kcal = 10^5cal = 4.184 \cdot 10^5 J$$

Now lets find the height from energy conservation law:

$$0.28 \cdot E = mgh$$ $$h = \frac{0.28 \cdot E}{mg} = \frac{0.28 \cdot 4.184 \cdot 10^5}{60 \cdot 9.8} \approx 199.2\,m$$

So, he can rise it on approximately 200 m.

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