An AM radio station broadcasts an electromagnetic wave with a frequency of 586 kHz, whereas an FM station broadcasts an electromagnetic wave with a frequency of 90.9 MHz. How many AM photons are needed to have a total energy equal to that of one FM photon?

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.