- #1

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This is how I approach the problem:

I set

[tex] G \frac{m_{1}m_{2}}{r^2} = k \frac{Q^2}{r^2}[/tex]

and then solve for Q

Am I doing the right thing?

- Thread starter leolaw
- Start date

- #1

- 85

- 1

This is how I approach the problem:

I set

[tex] G \frac{m_{1}m_{2}}{r^2} = k \frac{Q^2}{r^2}[/tex]

and then solve for Q

Am I doing the right thing?

- #2

- 13,017

- 566

HINT:What is the period of Moon's revolution around Earth ??

Daniel.

- #3

freemind

Hmmm, I don't see anything wrong with your method leolaw.

- #4

- 13,017

- 566

Another clue:do you see somthing rather suspicious about his formula??

Daniel.

- #5

- 85

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Why do you need to know the period? I should use kepler's law?dextercioby said:

HINT:What is the period of Moon's revolution around Earth ??

Daniel.

- #6

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Just apply the second law of dynamics...

Daniel.

- #7

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Second law of dynamics mean Netwon Second law? But i thought you said I should forget about newton's law beforedextercioby said:

Just apply the second law of dynamics...

Daniel.

- #8

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So what's the answer & how did you get it...?

Daniel.

- #9

freemind

phew, thats a relief. I was just about to check myself into a mental institution!

- #10

- 85

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hahaa, this problem is even number on my textbook, so i dont have the answer.dextercioby said:

So what's the answer & how did you get it...?

Daniel.

But i do think that i need another way to approach this problem because i should aviod the use of law of gravity.

And by the way, why did you say there is smoething wrong with my equation before:

dextercioby said:

Another clue:do you see somthing rather suspicious about his formula??

Daniel.

- #11

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Daniel.

- #12

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Yes, but now i have to make sure if my idea is right

- #13

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What idea??Don't keep it a secret... :tongue2:

Daniel.

Daniel.

- #14

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if [tex] G \frac{m_{1}m_{2}}{r^2} = k \frac{Q^2}{r^2}[/tex] will get me the answer !

- #15

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- 566

Anyway,i guess you got it solved...One way or another...

Daniel.

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