# Revolutions and acceleration

1. Oct 7, 2008

### trainumc

i am comlpetely stuck on this problem

Two satellites are in circular orbits around Jupiter. One, with orbital radius r, makes one revolution every 16 h. The other satellite has orbital radius 4.0r. How long does the second satellite take to make one revolution around Jupiter?

2. Oct 7, 2008

### Hootenanny

Staff Emeritus
Welcome to Physics Forums.

We we certainly help you, but before we do you are required to show some effort in solving the problem yourself, either by providing a attempted solution or at the very least detailing your thoughts.

The homework template is there for a reason. Please use it.

3. Oct 7, 2008

### trainumc

well i don't know how to find the height but for the acceleration i know if

G= 6.67*10^-11
M= 5.97*10^24

then V=sqrt((GM/r)

but my solutions don't seem to be working

4. Oct 7, 2008

### Hootenanny

Staff Emeritus
You're on the right lines, but not quite there yet. I'll offer you a few hints in the right direction.

$$a_c = \omega^2 r$$

$$\omega = \frac{2\pi}{T}$$

Where T is the orbital period.