Earth has a large mass. If you have a mass of 100 pounds (convert to kilograms) What is the gravitational force that you exert on earth? (the acceleration due to earth’s gravity is 9.8m/s^2).

Respuesta :

We are asked to find the gravitational force that you exert on earth.

First, convert the mass of 100 pounds into kg.

1 kg is equal to 2.205 pounds.

[tex]\frac{100}{2.205}=45.36\; kg[/tex]

Recall Newton's Universal law of gravitation given by

[tex]F_G=G\frac{M\cdot m}{R^2}[/tex]

Where M is the mass of Earth, m is the mass of the person, G is the gravitational constant, and R is the radius of the Earth.

G = 6.67×10⁻¹¹ m³/kg⋅s²

M = 5.97×10²⁴ kg

R = 6.37×10⁶ m

m = 45.36

Let us substitute all the given values into the above formula

[tex]\begin{gathered} F_G=G\frac{M\cdot m}{R^2} \\ F_G=6.67\times10^{-11}\cdot\frac{5.97\times10^{24}\cdot45.36}{(6.37\times10^6)^2} \\ F_G=445.14\; N \end{gathered}[/tex]

Therefore, the gravitational force that you exert on earth is 445.14 N