Question

A helicopter lifts a 84 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/15. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her

Answer 1

Part a)

`F = 878.9 N`

Part b)

`F_g = 824 N`

Step-by-step explanation:

Part a)

For the force equation of Astronaut we know that

`F_(net) = ma`

so here we will have

`F - mg = ma`

as we know that

`a = (g)/(15)`

so we will have

`F = mg + (mg)/(15)`

`F = (16)/(15) mg`

`F = (16)/(15)(84 * 9.81)`

`F = 878.9 N`

Part b)

Gravitational force on her is given as

`F_g = mg`

`F_g = 84 * 9.81`

`F_g = 824 N`