The Doppler effect describes the change in the observed of a wave when there is relative motion between the wave source and the observer. *
Amplitude
Interference
Wavelength
Frequency

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?