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A helicopter lifts a 80 kg astronaut 20 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/11. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her?

Question

A helicopter lifts a 80 kg astronaut 20 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/11. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her?

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Step 1

(a). The work done by...

W Fd
m(g+a)h
= (80 kg )(9.8+ 0.89)m/s'(20m
- 17104J
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W Fd m(g+a)h = (80 kg )(9.8+ 0.89)m/s'(20m - 17104J

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