Physics Help Forum Gravitational potential energy

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 Aug 14th 2017, 08:03 AM #1 Junior Member   Join Date: Jul 2017 Posts: 4 Gravitational potential energy hi, everyone, i have no idea with question number 10, anyone have idea about this? Sent from my Lenovo A5000 using Tapatalk
Aug 14th 2017, 08:30 AM   #2
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 Originally Posted by goldsomecriss hi, everyone, i have no idea with question number 10, anyone have idea about this? Sent from my Lenovo A5000 using Tapatalk
Forum policy states that we can't help you until you've taken a shot at answering it. However it seems clear that you don't know where to start so I can get you started.

State what you've learned about gravitational energy and see if that gets you going in the right direction.

 Aug 14th 2017, 08:36 AM #3 Junior Member   Join Date: Jul 2017 Posts: 4 Thanks,As i know, gravitational potential energy use the formula of (-GMm/R)...this is the only one i know, but still have no idea for further calculation... Sent from my Lenovo A5000 using Tapatalk
 Aug 14th 2017, 09:00 AM #4 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 756 I had great trouble with your last thread because (I think) the picture you posted was too large. Can you rejig it so that I can see more than one corner of it please? We don't get this problem with other posts so is it something to do with tapletalk or whatever? goldsomecriss likes this.
Aug 14th 2017, 10:02 AM   #5
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 Originally Posted by goldsomecriss Thanks,As i know, gravitational potential energy use the formula of (-GMm/R)...this is the only one i know, but still have no idea for further calculation... Sent from my Lenovo A5000 using Tapatalk
What kind of course is this? Is it summer school or something? Didn't your text or professor give you an examples of using that formula? I ask these questions, not because I'm stingy or lazy with my help, but because I know from many years of experience that the best way to understand a concept is to force yourself to solve problems, whether they are easy or whether they're hard. I'll give you a little hint to get going.

Hint: Potential energies add up. That means that if you want to find the total potential energy of a system then you add the contributions from each source. Does that help any?

Last edited by Pmb; Aug 14th 2017 at 10:45 AM.

 Aug 14th 2017, 12:02 PM #6 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,272 Do you know how to determine the gravitational PE at points A and B if there was only one mass M? For two masses you simply add the PE due to each individual mass. Pmb and goldsomecriss like this.

 Tags energy, gravitational, potential

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