It is likely that the density of the universe is made up mostly of

When you skid to a stop on your bike, you can significantly heat the small patch of tire that rubs against the road surface.

The Great Lakes of the United States are often covered with a sheet of ice every winter. Which best explains why this ice does not sink to the bottom?

A radio transfers 270 J of energy electrically, 94.5 J is transferred by sound. Work out the efficiency of this radio. Give your answer as a decimal.

How can you tell high frequency on a wave

A bus is traveling with a uniform acceleration of 2.75 meters/second. If the initial velocity of the bus is 16.5 meters/second, what will its velocity be after 9.00 seconds?

When is the zebra in motion when it is not moving

1) What happens when two negatively charged tape strips are placed near each other?

Claudia throws a baseball to her dog. Which free-body diagram shows the baseball when it's flying horizontally in midair? (Assume no air resistance.)

What causes an air conditioned to turn on

A turntable is spinning on a frictionless axle when a ball of putty is dropped onto it from above. The putty sticks to the turntable when it lands. Is angular momentum conserved for the turntable and putty (the system) during this process?