1. What is the power of an engine that does 3000 J of work in 60 s? 2. What is the power of an engine that does 6300 J of work in 90 s?
3. What is the power of an engine that does 4800 J of work in 120 s?

Explain earth's motion, using the terms "precession" and "rotation" in 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.

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?