Which of these is exhibiting kinetic energy?

a) a space station orbiting earth
b) a rock on a mountain ledge
c) an archer with a flexed bow
d)a person sitting on a couch while watching tv
e)the high-energy phosphate bonds of a molecule of at

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

The amount of potential energy possessed by an elevated object is equal to what?