An electric motor uses which of the following to convert electrical energy into mechanical energy?
electromagnet
battery
generator
transformer

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.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?