Physics
WAEC 2015
The mass of the earth is 6.0 x 10
24kg and that of the moon is 7.0 x 10
22kg. If the distance between them is 4.0 x 10
8m, calculate the force of attraction between them. [G = 6.7 x 10
-11Nm
2kg
-2]
-
A.
1.8 x 105N
-
B.
1.8 x 1010N
-
C.
1.8 x 1015N
-
D.
1.8 x 1020N
Correct Answer: Option D
Explanation
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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