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May 02, 2026, 11:57:37 am
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Author Topic: coletrains' physics questions  (Read 605 times)  Share 

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coletrain

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coletrains' physics questions
« on: March 05, 2010, 04:16:33 pm »
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A rocket is disabled at a height of 9 radii above the surface of the Earth. It is moving very slowly. By how much will its velocity change in the next 200s? (Take g at the surface of Earth as 10m/s/s, and assume that the local value of g does not change in the 200s)
 
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Re: coletrains' physics questions
« Reply #1 on: March 05, 2010, 04:30:39 pm »
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, so (or )

Therefore, if we take an earth radius to be , then







Then apply
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coletrain

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Re: coletrains' physics questions
« Reply #2 on: March 05, 2010, 04:37:22 pm »
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thanks, here's another one

A small satellite orbits Mars. It has a kinetic energy of 3.0 x10^10 J, and is at constant distance of 8.0 x 10^7m from the center of Mars. What is the weight of the satellite at this height.
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appianway

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Re: coletrains' physics questions
« Reply #3 on: March 05, 2010, 04:44:19 pm »
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I think this is how you do it.

K = mv^2/2
Weight force = centripetal force = mv^2/r
Thus 2K/r = weight force
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