democritus democritus

01-04-2015
Physics

Answered

On the planet Zorag, Angel drops a 5 Kg rock from a space shuttle hovering 10 meters high. The rock does 300 N*M of work on the way down. What is the acceleration due to gravity on planet Zorag?

Answer :

01-04-2015

The work done in bringing the rock from the ship to the ground is
the potential energy it has before Angel drops it.

   Potential energy = (mass) x (gravity) x (height)

You have said that this amounts to 300 N-m .

   300 N-m = (5 kg) x (gravity) x (10 m)

Divide each side by 10m :      30 N = (5 kg) x (gravity)

Divide each side by 5 kg : 6 N/kg = 6 m/s² = gravity

=============================

By the way ... The rock doesn't do the work on the way down. Gravity does it !

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