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    Hello there,

    Could someone please help me with the question below please:-

    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).

    I get an answer of 1.07*10^23kg. The books answer is 1.8*10^27kg.

    Help Please. :P Thanks!
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    u need to square velocity
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    (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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