WAEC - Physics (1990 - No. 38)
Given that the gravitational constant is 7 X 10-11 Nm2kg-2, what is the force of attraction between 106kg mass of lead hanging one metre away from a 103kg mass of iron?
7 x10-20N
7 x 10-5N
7x10-2N
7x103N
7x100N
Giải thích
F =
Gm1m2r2
= 7 x 10-11 x 106 x 1031m
= 7 x 10-2