College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 51

It takes 27 days for the Moon to orbit the Earth in a nearly circular orbit of radius 3.80 × 10 5 km. (a) Show in symbol notation that the mass of the Earth can be found using these data. (b) Compute the Earth's mass and com-pare with the value given inside the back cover of the book.