1. Potential energy and a roller coaster. A 1000-kg roller coaster car moves from point A to B then C. (a) What is the potential energy at B and C
relative to A?

(b) What is the change in potential energy
as it goes from B to C?

(c) What is the potential energy at B and C relative to point C?

(d) What is the change in potential energy as it goes from B to C?

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?