# Determine the mass of the Earth from the known acceleration of gravity on Earth (g = 9.8 m / s2; the radius of the planet is 6400 km). decision
g = G * M / R ^ 2; M = g * R ^ 2 / G = 9.8m / s2 * (6.4 * 10 ^ 6m) / 6.67 * 10 ^ -11 Nm2 / kg2 = 6 * 10 ^ 24kg. Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.
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