Which example possesses mechanical potential energy? . a. a taut guitar string. b. an oscillating pendulum. c. a roller coaster ride. d. a child on a swing. e. a speeding car

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?

How does the motion of an airplane compare to the motion of a rocket ?