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# A2 Physics Help Please. :) watch

1. Hello there,

The moon "lo" orbits jupiter in 43 hours at an orbital radius of 4.2*10^8m. Use these data to calculate the mass of jupiter.

My workings .

The moon orbiting Jupiter is like an object travelling an a circle. Gravity is acting centripetally keeping this moon in orbit.

Force Due To Gravity = Centripetal Force
GMm/(r^2) = m(v^2)/r

2(pi)*(4.2*10^8)/(43*3600) = 17047.402.

(6.67*10^-11)M/(4.2*10^8)^2 = (17047.402)/(4.2*10^8).

2. u need to square velocity
3. (Original post by 05wilsea)
u need to square velocity
Thank u very much. Didn't notice I didn't square the velocity. :L. Thanks again.

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