The 230 volt mains electricity supply causes a current of 11 amps to flow through the cable. Calculate the amount of charge that flows through the cable when the cable is
switched on for 2 hours and give the unit

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

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.