With what force does the Earth attract a body weighing 40 kg?

To find the required force of attraction of a given body by the Earth, we apply the formula: F = G * (m * Mz) / (Rz + h) ^ 2.

Variables and constants: G – gravitational constant (G = 6.67 * 10 ^ -11 m3 / (kg * s2)); m – body weight (m = 40 kg); Mz is the mass of the planet Earth (Mz = 5.9726 * 10 ^ 24 kg); Rz – average radius (Rz = 6371 * 10 ^ 3 m); h is the distance between the body and the Earth’s surface (we assume that h = 0 m).

Calculation: F = G * (m * Mz) / (Rz + h) 2 = 6.67 * 10 ^ -11 * (40 * 5.9726 * 10 ^ 24) / (6371 * 10 ^ 3 + 0) 2 = 392.6 N.