This figure shows the force on a 0.1-kilogram mass at various distances from Earth. Notice that the force decreases as the square of the distance. Now, consider satellites A and B, both circling Earth. If A has ten times the mass of B but B is 1/10 of the distance to the center of Earth as is A, what is the gravitational force on A relative to that of B due to Earth?
a. 1/10 the amount.
b. The two are equal.
c. 10 times as much.
d. 1/100 times as much.
e. 100 times as much.
Question 2
What two facts did Newton need to be able to calculate the acceleration of the Moon?
a. The distance to the Moon and the diameter of the Moon.
b. The time it takes the Moon to make one revolution and the distance from the Earth to the sun.
c. The diameter of the Moon and the speed of the Moon's rotation.
d. The diameter of the Moon and the diameter of Earth.
e. The distance to the Moon and the time it takes the Moon to make one revolution.
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