Question

Two planets have a gravtiational force of

6.20×103 N between them. If the distance between the two planets is doubled, what will the force be?

1.55×103 N

1.24×104 N

2.48×104 N

3.10×103 N

B

Two planets are orbiting the sun at the same distance and at the same speed. Planet 1 has a mass of 930. kg and planet two has a mass of 3.89×103 kg. What is the ratio, F1/F2, the gravitational force on planet 1 to that of the gravitational force on planet 2?

0.239

0.0598

4.18

3.62×106

C

In order to escape planet 1, you need an escape speed of 1.23×104 m/s. Planet 2 has the same radius as planet 1 but is half as dense as planet 1. What is the needed escape speed to leave planet 2?

6.15×103 m/s

55.5 m/s

78.4 m/s

8.70×103 m/s

Answer 1