During an occultation or "covering up" of neptune by the moon, an astronomer measures the angular 's speed as it that it takes the moon's edgc 4 seconds to cover neptune completely. etimat size of neptune as seen from earth. hint: you need to calculate the moon "moves" on the celestial sphere a. 1 are second b. 2 are seconds c. 5 arc seconds d. 10 arc seconds e. 45 arc seconds

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?