8. Centripetal Forces & Gravitation

Which fundamental force is responsible for keeping the Earth in orbit around the Sun?

According to Newton's Law of Gravity, which of the following objects would exert the strongest gravitational pull on another object at a fixed distance ($r$)? The gravitational force is given by $F_g=\frac{G{m}_1{m}_2}{r^2}$.

According to Newton's Law of Gravity, what force is primarily responsible for keeping planets in the solar system from moving in straight lines through the galaxy? $F=\frac{\mathrm{G\; m\_1\; m\_2}}{r^2}$

According to Newton's Law of Gravity, what is the approximate value of the acceleration due to gravity at Earth's surface ($g$)?

Which statement best compares the gravitational force and the strong force?

Which of the following best describes what is meant when we say that the $\mathrm{Sun}$ is in gravitational equilibrium?

Which of the following best explains why the north pole of a compass needle points toward Earth's geographic north pole?

Which of the following statements about the force of gravity is false?

Which statement correctly compares the acceleration due to gravity on $Earth$ and on the $Moon$?

According to Newton's Law of Gravity, what is the relationship between the gravitational force $F$ and the masses $m_1$ and $m_2$ of two objects?

 Two spheres are separated by 10m. If the lighter 40kg sphere feels a gravitational force of 1.6 × 10^-9 N, what is the mass of the heavier sphere?

A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle θ due to a massive mountain nearby (Fig. 6–37). Find an approximate formula for θ in terms of the mass of the mountain, m_M, the distance to its center, D_M, and the radius and mass of the Earth.