# Relativistic Orbits - Page 3

Questions

- How can parallax be used to determine distances?
- What is the distance from the Earth's center to a point in space where the gravitational acceleration due to the Earth is 1/24 of its value at the Earth's surface?
- What forces keep a planet in orbit and how does each one work on the planet?
- How is the speed of light measured?
- Which method relies on the mass of a dark object revealing its presence?
- How does a radial velocity measurement depend on inclination?
- Is it possible for a moon in orbit around a planet to have a secondary moon orbiting the moon itself?
- A 2300 kg rocket shuts off its engine 494km above earth's surface. Its velocity at burnout is 3000 m/s directly upward. Ignoring air resistance, what maximum height will the rocket reach?
- Why do solar lunar eclipses occur?
- Two satellites are in circular orbits around the earth. The orbit for satellite A is at a height of 539 km above the earth's surface, while that for satellite B is at a height of 876 km. How do you find the orbital speed for satellite A and satellite B?
- Mimas, a moon of Saturn has an orbital radius of #1.87 * 10^8# #m#. What is the orbital period?
- How does the moon accelerate as it orbits the Earth?
- If the mass of a satellite orbiting the earth were to increase, what would happen to that satellite?
- What two motions combine to produce an orbit?
- Will a planet or comet be moving faster in its orbit when it is farther from or closer to the sun?
- Why is Earth's acceleration usualIy very small compared to the acceleration of the object that Earth interacts with?
- When the Moon orbits Earth, what is the centripetal force?
- How does gravity keep a planet moving in an orbit around the sun?
- On the surface of Earth, a spacecraft has a mass of #2.00 * 10^4# kilograms. What is the mass of the spacecraft at a distance of one Earth radius above Earth's surface?
- A satellite is put in a circular orbit about Earth with a radius equal to one-half the radius of the Moon's orbit. What is its period of revolution in lunar months?