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March 6, 2015

Posted by **Sandra** on Sunday, April 4, 2010 at 7:21am.

An artificial satellite orbiting the Earth quadruples its kinetic energy.

Assuming no external torques act on the system, the radius of the orbit will ...

a. Decrease by a factor of 4

b. Decrease by a factor of 2

c. Remain the same

d. Increase by a factor of 2

e. Increase by a factor of 4

- Physics -
**Sandra**, Sunday, April 4, 2010 at 7:43amWould the answer be b..

What I did was figured out the relationship between KE and speed. If KE quadruples, speed would only double. I am not sure about the next step though, I just used the following equation: mvr = nk; this gives me that r and v are inversely related so if v is increasing by 2, r would decrease by 2..

Is this the correct way to go about doing this, or is there another equation that can can used more appropriately for this question..

- Physics -
**bobpursley**, Sunday, April 4, 2010 at 10:08amYou have it.

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