Question on: WAEC Physics - 2015
The mass of the earth is 6.0 x 1024kg and that of the moon is 7.0 x 1022kg. If the distance between them is 4.0 x 108m, calculate the force of attraction between them. [G = 6.7 x 10-11Nm2kg-2]
A
1.8 x 105N
B
1.8 x 1010N
C
1.8 x 1015N
D
1.8 x 1020N
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Correct Option: D
F = (\frac{GM_1M_2}{12^2})
F = 6.7 x 10-11x
F = (\frac{M_1M_2}{R^2})
F = (\frac{6.7 \times 10^{-11} \times 6.0 \times 10^{24} \times 7.0 \times 10^{22}}{(4 \times 10^8)^2})
= 1.8 x 1020N
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