Which one of the following frequencies of a wave in the air can be heard as an audible sound by the
human ear?
a. 0.10 hz
b. 1,000 hz
c. 100,000 hz
d. 10 hz

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.