A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them. (G = 6.67 x 10-11 Nm2 kg-2)
-
A.
1.59 x 10-14 N -
B.
2.80 x 10-7 N -
C.
1.30 x 10-2 N -
D.
6.30 x 1013 N
Correct Answer: Option B
Explanation
F = (frac{GM_1M_}{r^2})
= (6.67 times 10^{-11} times 70 times 60}{1^2})
= 2.8014 x 10-7 N