"Consider the Earth and the Moon as a two-particle system. (a) How far from the center of the Earth is the gravitational field of this two-particle system zero?"

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?