You throw a 2.0 kg basketball at the hoop with an initial total energy of 500 J. (neglect air friction on the ball). a) When the ball reaches the top of its arc, what is its total energy? b) When the ball is about to hit the ring, what is its total energy? c) What principle are you demonstrating?

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

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.

If you put a helium-filled balloon in the refrigerator, what will happen?