1. I wanna ask if we now the energy of a planet (mc2) and we divided that energy over the radius(R) of that planet what kind of force(F) we get --> mc2/Radius = F(?)

2. Originally Posted by Sanev
I wanna ask if we now the energy of a planet (mc2) and we divided that energy over the radius(R) of that planet what kind of force(F) we get --> mc2/Radius = F(?)
I'll give you a hint, is the REST energy.

3. So i will get rest force?

4. Originally Posted by Sanev
So i will get rest force?
Meaning that there is no such thing.

5. So i can't use this formula because it doesn't mean anything

6. Originally Posted by Sanev
So i can't use this formula because it doesn't mean anything
No, it doesn't. While the answer comes outs in units of force, it is a meaningless answer.

I'll give you an example: Let's say that you are have been driving for an hour in a circle with a radius of 10 miles. 1 hr is a unit of time and 10 miles is a unit of distance and miles per hour is distance divided by time. Thus if you divide 10 miles by one 1 hour, you get 10 mph. But the time you spent driving and the radius of the circle combined have nothing to do with any kind of speed. The 10 mph that pops out is a meaningless answer.