Wind blowing across suspended power lines may
cause the power lines to vibrate at their natural
frequency. this often produces audible sound
waves. this phenomenon, often called an
aeolian harp, is an example of
(1) diffraction (3) refraction
(2) the doppler effect (4) resonance

Which of the following is an example of units for speed

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe