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Sally has a mass of 45.9 kilograms. Earth has a mass of 5.98 x 10^24 kilograms and an average radius of 6.38 x 10^6 meters.What is the force due to gravity between Sally and Earth? Include units in your answer. Answer must be in 3 significant digits.

User Essex
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Newton's law of universal Gravity:

F = G * (M1 * M2)/ r^2

Where:

G = gravitational constant = 6.674 x10^-11 Nm^2kg^2

M1 = mass 1 = 45.9 kg

M2 = mass 2 = 5.98 x 10 ^24 kg

r = Distance between the 2 objects = 6.38 x 10 ^6 m

Replacing;


F=6.674x10^(-11)Nm^2kg^2\cdot\frac{45.9\operatorname{kg}\cdot5.98x10^(24)\operatorname{kg}}{(6.38x10^6m)^2}

F = 450.048 N

User TechNeilogy
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