Which of the following would not increase the velocity of a sound wave in air?
a. increasing the temperature of the air.
b. lowering the density of the air.
c. lowering the humidity of the air.
d. increasing the wind speed in the direction the wave is traveling

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Apossible explanation for a set of facts that can be tested by further investigation is called

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.