Which of the following is the correct equation for the reaction below? One molecule of propane gas reacts with five molecules of oxygen gas to
form three molecules of carbon-dioxide gas and four molecules of water
vapor.
A. C3H8 (9) + 50 (g) → 3C0 (g) + 4H20 (9)
B. CH (g) + 502 (g) → 3C02 (g) + 4H0 (9)
C. C3H8 (s) + 502 (s)
3CO2 (s) + 4H20 (s)
D. C3H8 (9) + 502 (9)
3CO2 (g) + 4H20 (g)

What kind of simple machine is a catapult?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.