#2 #6 #8 #102. The speed of the moon on its orbit is approximately 1 km/s and the earth-moon distance is 380,000 km. Show these numbers yield an acceleration for the moon that is very close to that given in the text.
The acceleration is centripetal acceleration, so
6. Two spacecraft in outer space attract each other with a force of 1 million N. What would the attractive force be if they were one-half as far apart?
8. How would the sun's gravitational force for the earth change if the earth had one-half of its present mass?
10. By what factor is the gravitational force on an astronaut reduced when the spacecraft is five earth radii away from the center of the earth?
