Calculate the force of attraction between a 80kg man and the eart.
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F=GMm/R^2
mass of earth....M=6×10^24 kg
mass of man, m=80 kg radius of earth, R=6.4×10^3 km=6.4×10^6 m
universal gravitational constant, G=6.67×10^−11 Nm^2/kg^2
F=6.67×10^−11×6×10^24×80/(6.4×106)^2
F=3201.6×10^13/40.96×10^12
F=781.64 N
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