Do moving downhill in a roller coaster have potential energy or kinetic energy

The maximum power output of an engine is usually given in units called

If the wavelength of a sound increases, the frequency of that sound also increases. True or False?

Neutralization is an important part of digestion. Why?

6) Why do electromagnetic waves not require a medium for travel?

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

If you do 1000j of work on a system and remove 500j of heat from it, what is the change in its internal energy

Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 4.5 m long, its mass is 0.42 kg, and the force exerted on it by the children is 71 N.

An object will only change its motion if a force is directly applied to it. is this a true statement?

Janice has just measured the density of an object. Which value is possible? (Density: D = )

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy