7.1 Kepler's Laws of Planetary Motion
A planet of mass m circles a sun of mass M. Which distance changes throughout the planet’s orbit?
An artificial satellite orbits the Earth at a distance of 1.45×104 km from Earth’s center. The moon orbits the Earth at a distance of 3.84×105 km once every 27.3 days. How long does it take the satellite to orbit the Earth?
- 0.200 days
- 3.07 days
- 243 days
- 3721 days
Earth is 1.496×108 km from the sun, and Venus is 1.08×108 km from the sun. One day on Venus is 243 Earth days long. What best represents the number of Venusian days in a Venusian year?
- 0.78 days
- 0.92 days
- 1.08 days
- 1.21 days
7.2 Newton's Law of Universal Gravitation and Einstein's Theory of General Relativity
What did the Cavendish experiment measure?
- The mass of Earth
- The gravitational constant
- Acceleration due to gravity
- The eccentricity of Earth’s orbit