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Zina [86]
3 years ago
5

What average mechanical power (in W) must a 64.5 kg mountain climber generate to climb to the summit of a hill of height 285 m i

n 49.0 min? Note: Due to inefficiencies in converting chemical energy to mechanical energy, the amount calculated here is only a fraction of the power that must be produced by the climber's body.
Physics
1 answer:
kakasveta [241]3 years ago
7 0

Answer:61.275 W

Explanation:

Given

Mass of climber m=64.5 kg

Height to climb h=285 m

Time taken t=49 min \approx 2940 s

Now Using  Work-energy Theorem work done is given by

W=m g h

W=64.5\times 9.8 \times 285

W=180148.5 J

W=180.148 kJ

Now  Average Mechanical Power is given by

P=\frac{W}{\Delta t}

P=\frac{180.148}{2940}=0.0612 kW

P=61.275 W

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If the retina is 1.7 cm from the lens in the eye, how large is the image on the retina of a person of height 1.5 m standing 9.0
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