1.

What would the weight of a 59.1 kg astronaut be on the surface of a planet twice as massive as Earth and having twice Earth's radius?

1. 580 N
2. 290 N
3. 1160 N
4. 118 N

2.

What is the gravitational force between two 7.00 kg spheres whose centers are separated by 35 cm?

1. 2.7x10^-8
2. 1.1x10^-7
3. 7.9x10^-9
4. 3.3x10^-7

3.

If the Earth was twice as massive but revolved around the sun at the same distance as is does now, the orbital period would be:

1. 4 years
2. 2 years
3. 1 year
4. 6 months

4.

A satellite completes one full circular orbit around the Earth. The work performed by the Earth's gravitational force on the satellite is:

1. always positive
2. zero
3. always negative
4. positive more than negative

5.

What is the ratio of potential energy to kinetic energy for a comet that has just enough energy to escape the Sun's gravitational field? (Please use accepted conventions)

1. 1/2
2. 1
3. 2
4. -1
5. -2