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## In 2 minutes, a ski lift raises four skiers at a constant speed to a height of 123 m. The average mass of each skier is 71 kg. What is the a

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In 2 minutes, a ski lift raises four skiers at a constant speed to a height of 123 m. The average mass of each skier is 71 kg. What is the average power provided by the tension in the cable pulling the lift

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Physics
3 months
2021-07-28T15:10:11+00:00
2021-07-28T15:10:11+00:00 1 Answers
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## Answers ( )

Answer:The average power provided by the tension in the cable pulling the lift is = 714 WExplanation:Given data

Mass = 71 kg

Change in height = 123 m

When the lift moves in upward direction then in that case kinetic energy is constant & only potential energy changes.

Change in potential energy Δ PE = m g ( )

Δ PE = 71 × 9.81 × 123

Δ PE = 85670.73 J

Time = 2 min = 120 sec

So average power is given by

Therefore the average power provided by the tension in the cable pulling the lift is = 714 W