In a perfect vacuum, light waves travel at 300,000 kilometers every second. When light waves travel through materials, such as air, they

A. speed up

B. slow down

C. increase in amplitude

D. Heat up

The fastest growing source of energy in the world is wind power. a. true b. false

The cue ball collides with a pool ball. However, the pool ball doesn't have much mechanical energy as the cue ball. How is energy conserved if the pool ball has less energy than the cue ball?

Which of the following is the correctly abbreviated S I unit describing The amount of a substance

Warm water is generally less dense than cold water. the mass of a ship increases as it is loaded with cargo. if a ship will be sailing through warm and cold water, what should people think about as they load the ship with cargo?

What is the main way sound waves cause hearing loss?

At what temperature did the substance in the test tube into a solid?

What occurs when the velocity of Earth is doubled? a. The orbit of Earth around the Sun becomes smaller b. The orbit of Earth does not change c. The Earth escapes the Sun d. The orbit becomes more elliptical

When is a body said to be at rest

27. Calculate the impulse when an average force of 10 N acts on a cart for 5.0 s.

A boy on a bicycle is resting at the top of a hill then he rides his bicycle down the hill describe how the boy potential and kineti energy differ at the top middle and bottom of the him