Tectonic plates often shift position by the force of liquid rock emerging from below the earth’s surface and then cooling to form hard rock. this most often occurs a-on the ocean floor b-in mountain chains c-along coastlines d-during earthquakes

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

Ahorizontal wire is tied to supports at each end and vibrates in its second-overtone standing wave. the tension in the wire is 5.00 n, and the node-to-node distance in the standing wave is 6.28 cm. (a) what is the length of the wire? (b) a point at an anti- node of the standing wave on the wire travels from its maximum upward displacement to its maximum downward displacement in 8.40 ms. what is the wire's mass?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge