According to the most widely accepted scientific explanation, how did the universe begin?

A. As a collection of protons and neutrons

B. As a cloud of gas and dust

C. With a huge collision

D. With a giant expansion

The speed of any sound wave as it travels through a medium is dependent mainly on the?

Two cars are travelling side by side down a straight road in opposite directions. Both cars are travelling at a speed of 22m/s. What is their relative speed?

What is the mass of an object traveling at 20 m/s with a kinetic energy of 4000 J?

Which of the following proved that the de broglie's equation was correct? A) Einstein theory of relativity B) Planck's equation C) quantum mechanics D) Davisson-Germer experiment

What is the gravitational force on a 10 kg sled traveling at 3.5 m/s down a track? a. 9.8 N b. 3.5 N c. 35 N d. 98 N

Comparing and contrasting ionic and covalent bonds?

Elevation above sea level is called

The train traveled 500 kilometers north to Odessa in 2 hours. What's the train's speed? What is the velocity?

Are microwaves and radio waves faster or slower than other types of electromagnetic energy?

If you dive under-water, you notice an uncomfortable pressure on your eardrums due to the increased pressure. The human eardrum has an area of about 70 mm2 (7*10-5m2), and it can sustain a force of about 7 N without rupturing.