How do electromagnetic waves move through space?

Which characteristics can be used to differentiate star systems? Select three options A. the number of stars in the system B. the level of dust and gas C. the age of the stars in the system D. the way stars are organized in the system E.

Hydrogen has only one electron in its only (and outer) electron shell. If a hydrogen atom were to absorb a small amount of energy, where would Bohr say the electron would go? A. fly off the atom B. nowhere, it would just speed up. C.

If a ride at disneyworld goes from rest to 27 m/s in 2.8 seconds and the mass of the ride and riders together 5000kg. What is the average power required to do this? Give your answers in both watts and horsepower

The speed of sound is greater through a solid than through a gas because the molecules in a solid are A) still. B) vibrating. C) farther apart. D) closer together.

A 200 kg object is going 4m/s. Find its kinetic energy

A large body of air hats has similar properties of a temperature and moisture is a

An ice rink is 200 feet long and 85 feet wide. The four corners of the rink are rounded to a radius of 24 feet. What is the surface area of the rink? Round the answer to the nearest square foot.

Which statement is correct about gasoline when it is burned? Heat energy is created by the gasoline. The total energy of the gasoline decreases. Chemical energy in the gasoline is destroyed. Chemical energy is transformed into heat energy.

The tilt of the Earth's axis of rotation changes over a period of 41,000 years. Which of these statements best predicts a long term effect of the changes in the tilt of the Earth's axis of rotation? a. The Earth's climate would change. b.

What do keratinized cells form?