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April 24, 2014

April 24, 2014

Posted by **Angelina** on Thursday, February 23, 2012 at 11:00pm.

Moon X km?

Moon Y km?

I have posted this earlier but didn't get a respond am sorry to re-post it but I really need help with this!

Physics - drwls, Sunday, February 19, 2012 at 12:27pm

The Kepler's law formula you need to use is:

T²/R³ = 4π²/(GM)

M is the mass of the planet, in kg

G is the universal constant of gravity, which is easily found online.

T is the period in seconds

Tx = 1.840*10^5 s

Ty = 3.050*10^5 s

R is the orbit radius in meters. Do the calculations of R for planets X and Y, one at a time.

Ok i tried this but i still cant get the answer right I don't understand it :(

Physics - bobpursley, Thursday, February 23, 2012 at 8:46pm

T^2/R^3=4PI^2/GM

R= cubrt ( T^2 G*mass/4PI^2)

solve for R, knowing period T, G, Mass.

Do that for each moon.

Physics - Angelina, Thursday, February 23, 2012 at 9:00pm

Ok so this is what i did cubrt(2.13^2(6.67x10^-11)(2.0x10^26))/(4pi2)=R which is 1159307512 but then thats wrong so i don't know what i am doing wrong?

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