Multiple Choice
7.1 Kepler's Laws of Planetary Motion
A planet of mass m circles a sun of mass M. Which distance changes throughout the planetâ€™s orbit?
 $\stackrel{\xc2\xaf}{{f}_{1}{f}_{2}}$
 $\stackrel{\xc2\xaf}{mM}$
 $\stackrel{\xc2\xaf}{M{f}_{2}}$
 $\stackrel{\xc2\xaf}{M{f}_{1}}$

12,500\,\text{km}

100,000\,\text{km}

200,000\,\text{km}

400,000\,\text{km}
An artificial satellite orbits the Earth at a distance of 1.45Ã—10^{4} km from Earthâ€™s center. The moon orbits the Earth at a distance of 3.84Ã—10^{5} 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 1.496Ã—10^{8} km from the sun, and Venus is 1.08Ã—10^{8} 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 Earthâ€™s orbit

0.810 m/s^{2}

1.23 m/s^{2}

5.39 m/s^{2}

37.4 m/s^{2}

It would feel the same if the force of gravity suddenly became weaker. This illustrates Einsteinâ€™s postulates that gravity and acceleration are indistinguishable.

It would feel the same if the force of gravity suddenly became stronger. This illustrates Einsteinâ€™s postulates that gravity and acceleration are indistinguishable.

It would feel the same if the force of gravity suddenly became weaker. This illustrates Einsteinâ€™s postulates that gravity and acceleration are distinguishable.

It would feel the same if the force of gravity suddenly became stronger. This illustrates Einsteinâ€™s postulates that gravity and acceleration are distinguishable.