## Physics Help >> Index to Physics Homework Help » Kepler and Newton Quiz

 New Problems reloads the page with new variable values in all questions. You must do this after grading the test to rework it another time. Make sure to enter your answers in the specified units .
 1
The moon has an orbital period of 27.3 days and a mean distance of 3.80 x 105 km from the center of the Earth. Find the distance (km) an artificial satellite is from the center of Earth if its period is minutes.

 2
A planet has two moons. the first is times as far from the center of the planet as the second and has a mass that is times the mass of the second. What is the ratio of the gravitational force on the first planet to the gravitational force on the second?

 3
Two spherical balls are placed so their centers are m apart. The force between them is x 10-8 N. If the mass of the smaller ball is kg, what is the mass of the other ball?

 4
How far (in km) from the center of the Earth would a person with a weight of N on Earth have to be to have a weight of N?

 5
A kg child is sitting on a merry-go-round with a radius of m. The time it takes the merry-go-round to make one revolution is s. Find the centripetal acceleration of the child.

Once you have submitted your answers for grading by clicking the grade button, you cannot resubmit answers for the same Problem Set--you must use the 'New Problems' button first.