8. Centripetal Forces & Gravitation

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 $\mathrm{minutes}$?

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?

How does friction with the atmosphere affect the speed of an artificial satellite in low Earth orbit?

In a two-body system consisting of a star and a planet orbiting their common center of mass, what is the period required for both objects to complete one full orbit around the center of mass?

Approximately how long does it take for a spacecraft using current technology, such as a $Hohman$ transfer orbit, to travel from $Earth$ to $Mars$?

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.

You throw a baseball horizontally while on the surface of a small, spherical asteroid of mass 7×10¹⁶ kg and diameter of 22km. What is the minimum speed so that it just barely goes around the asteroid without hitting anything?

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