Why is earth's surface not riddled with craters as is that of the moon?

What is work? How much work is done to move an object 0 meters?

How far from a concave mirror must an object be placed?

The speed of a car is decreasing uniformly from 35 m/s to 15 m/s in 4 s the magnitude of the car's acceleration is

What is the cooling power P? Recall that the rate at which energy is removed, also called the cooling power, was described earlier as being constant. Express your answer numerically in watts (joules per second).

1. What will happen to the brightness of the light bulb if the switch in this circuit is suddenly closed?

How much work is done when a 4.0-newton box is carried horizontally a distance of 2.0 meters at a constant velocity?

You push a shopping cart filled with groceries (total mass = 20 kg) by applying a force to the cart 30° from the horizontal. If the force you apply has a magnitude of 86 N, what is the cart's acceleration? Assume negligible friction.

Does water expand more as the temperature drops even more below 0 deg? I am worried about the coolant in my rad. as the temp. is 40deg below.

A 1.00-kilogram ball is dropped from the top of a building. just before striking the ground, the ball's speed is 12.0 meters per second.

Why oil does not dissolve in water?