- #1

EthanVandals

- 55

- 2

## Homework Statement

Calculate the potential energy and kinetic energy of the moon, as well as it's escape velocity. Give the moon's period and angular speed. Consider the Earth to have a mass of 6 x 10^24 kg, the moon to have a mass of 7 x 10^22 kg, and their center separation distance to be 4 x 10^8 m.

## Homework Equations

I = mr^2

F(g) = (GMm)/r^2

KE = 1/2(I)(Omega)^2

PE = ?

Omega = ChangeinTheta/ChangeinTime

## The Attempt at a Solution

So far, I have drawn my free body diagram, and I've calculated the force due to gravity (the centripetal force in this case) to be 1.750875 x 10^20. This is based off the the F(g) formula. From here, I don't know where to move, because to calculate the other items I need, I believe I need the velocity of the moon, which is not provided. Can anyone give me a hand with this? Thanks!