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24 May, 15:25

M is directly proportional to r2

When r=2, m=14

Work out the value of m when r=12

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  1. 24 May, 15:28
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    we have M is durectly porpotional to r^2

    so M = (k) r^2

    and when r=2, m=14

    so 14 = (k) (2) ^2

    k=14/4 = 7/2

    so when r=12

    m = (7/2) (12) ^2 = (7/2) (144) = 504
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