For all of these questions, you need to use the following equation, which will tell you the force of gravity in those situations:

Fg = (Gm1m2)/r^2

where G is the universal gravitational constant, m1 and m2 are the masses of the objects, and r is the distance that separates their...

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For all of these questions, you need to use the following equation, which will tell you the force of gravity in those situations:

Fg = (Gm1m2)/r^2

where G is the universal gravitational constant, m1 and m2 are the masses of the objects, and r is the distance that separates their centers.

So then you just plug in the numbers you have provided. I will note that the proper radius of the Earth is 6.37 x 10^6.

Force on Earth: 6.08 x 10^3 Joules

Force on Mars: 2.22 x 10^2 Joules

Force on Pluto: 4.12 x 10^1 Joules