Rubber is unusual in that it shrinks or contracts when heated. Warming a rubber ball will -

A. decrease its density.

B. cause its volume to remain the same.

C. increase its density.

D. decrease its mass.

The buildup of charges on an object is called

You hear the engine roaring on a race car at the starting line. Predict the changes in sound as the race starts and approaches the camera A. the sound of the engine will get louder and pitch lower B.

What kind of energy does a burning log have? Can't figure this out for homework. It just needs to be a short answer.

What is the total and average of 4, 6, 8, 5, 7?

Grace pushes her foot against the wall with a force of 35 N while she stands on a skateboard. Her mass, including the skateboard, is 55 kg. What is her rate of acceleration? A. 1.6 m/s2 B. 0.64 m/s2 C. 90 m/s2 D. 20 m/s

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?

In a nuclear power plant, the temperature of the water in the reactor is above 100°C because of what?

Determine the total mechanical energy of a 250 g baseball if it has a velocity of 30 m/s when it leaves the pitcher's hand 1.2m above the ground.