8. Centripetal Forces & Gravitation

Which of the following quantities would be different for an object if measured on the $Earth$ and on the $Moon$?

In the context of gravitational forces in two dimensions, which of the following can be detected only by observing its effects on gravity?

Which of the following best explains why astronauts seem weightless while orbiting $Earth$?

In which region of the Sun is most of its energy generated through nuclear fusion?

Which force is the only force acting on an object in stable orbit around $Earth$, neglecting atmospheric drag and other perturbations?

Find the magnitude & direction of the net gravitational force on the center 5-kg mass in the rectangle below.

Why does one side of the $\mathrm{Moon}$ always face away from the $\mathrm{Earth}$?

Approximately how many $\mathrm{Earths}$ could fit inside the volume of the $\mathrm{Sun}$?

Why does the same side of the $\mathrm{Moon}$ always face the $\mathrm{Earth}$?

Which of the following best explains why the Moon always shows the same face to the Earth, even though it orbits the Earth in two dimensions?

In the context of gravitational forces in two dimensions, when is a comet's orbital speed at its maximum during its elliptical orbit around the $Sun$?

$Considering\; the\; gravitational\; force\; exerted\; by\; Earth,\; at\; which\; of\; the\; following\; locations\; would\; an\; object\text{'}s\; weight\; be\; the\; greatest?$

What is the magnitude of the gravitational force acting on the Earth due to the Sun? Express your answer in terms of the gravitational constant $G$, the mass of the Earth $M_E$, the mass of the Sun $M_S$, and the distance between them $r$.

A dam is thicker at the bottom than at the top because the pressure exerted by water increases with depth. Which of the following best explains this phenomenon?

Which statement best describes the role of gravitational forces in the formation of stars in $2$ dimensions?