# Homework Help: Universal Gravation Problem -experts needed haha

1. Nov 30, 2007

### physicsbhelp

[SOLVED] Universal Gravation Problem --experts needed haha

Never Mind.

Last edited: Nov 30, 2007
2. Nov 30, 2007

### Galileo's Ghost

Looks like you have the right equation and all the needed information. Check to make sure you are entering everything into your calculator properly. Simply solve the equation for R.

3. Nov 30, 2007

### Dick

The formula is right, the answer is way, way off. How did you get it?

4. Nov 30, 2007

### Dick

The G in the universal law of gravitation is not the same as g=9.81m/sec which is the acceleration due to gravity at the earth's surface. It's 6.67*10^(-11)*m^3/(kg*sec^2). Try keeping track of units.

Last edited: Nov 30, 2007
5. Nov 30, 2007

### Dick

I just edited to quote it. But you could look it up.

6. Nov 30, 2007

### Dick

Righto.

7. Nov 30, 2007

### Dick

If you say 24.713m, I'll agree with that. Put units on things. If you'd done that you would have realized 9.8m/sec^2 couldn't be the G you want. Because you wouldn't have gotten an answer in meters.

8. Nov 30, 2007

### Dick

S'ok. Word to the wise.

9. Dec 1, 2007

### cristo

Staff Emeritus
physicsbhelp, please don't delete all your posts after you have received help. It makes the thread totally unreadable, and useless to anyone else!

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