4. (10pts) The moon (mm = 7.34E22 kg) and the earth (mE = 5.97E24 kg) have a center to center separation of (4.03E8 m). A. Calculate the acceleration on the moon due to the earth. B. What is moon’s average orbital speed, assuming it has a circular orbit about the earth? C. What is the moon’s orbital period about the earth in units of days?

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?