8. Centripetal Forces & Gravitation

A satellite orbits at an orbital period of 2 hours around the Moon. What is the satellite's orbital altitude?

Three satellites, A, B, and C, orbit Earth in circular orbits at different altitudes: Satellite A is closest to Earth, Satellite B is at a medium altitude, and Satellite C is farthest from Earth. Rank the satellites in order of increasing orbital period.

Which of the following would cause the greatest increase in the acceleration of a satellite in circular orbit around Earth ($a=\frac{v}{r^2}$ or $a=\frac{\mathrm{GM}}{r^2}$)?

Why must a geostationary satellite orbit Earth in exactly $1$ sidereal day?

Which of the following orbits has the largest semimajor axis?

Why does the force of gravity change the speed of a satellite in an elliptical orbit?

Approximately how long does it take the Moon to complete one orbit around the Earth?

Which statement best describes how $\mathrm{Earth}’s$ average orbital speed compares to that of the other planets in the Solar System?

Given that the International Space Station completes $15.65$ revolutions per day around the Earth, what is the approximate period of its orbit in $\mathrm{minutes}$?

Suppose that you used some geometry and kinematics to estimate that the Earth goes around the Sun with an orbital speed of approximately 30,000 m/s (60,000 mph), and that the Sun is approximately 150 million kilometers away from the Earth. Use this information to estimate the mass of the Sun.

How does the period $T$ of a satellite in a circular orbit change as the distance $r$ from the central object increases?

Two manned satellites are in circular orbits around Earth at different altitudes. If Satellite $A$ is in a lower orbit than Satellite $B$, which of the following statements is correct about their orbital speeds?

Which factor is not needed when calculating the velocity of a satellite in a stable circular orbit around a planet?

Why do satellites launched into low-Earth orbits not remain there indefinitely?

Approximately how long does it take Earth to complete one orbit around the Sun?