Question

if the force of gravitation between the Earth and the body of mass M on its surface be 9 × 10^7 N what would be the value of M ? mass of the Earth = 6 × 10 ^24

Answer 1

M = mass of earth = 6×10^24
m = mass of an object on earth surface
R = distance between them = radius of earth = 6.4×10^3
G = Universal Gravitation Constant = 6.67×10^-11
Gravitation
$\frac{6 \times {10}^{24} \times 6.67 \times {10}^{ - 11} \times m} {6.4 \times {10}^{3} } = 9 \times {10}^{7} \\ m = 1.439280359820 \times {10}^{ - 8}$