Air is contained in a cylinder device fitted with a piston-cylinder. initially, the air is at 100 kpa and 23ºc and occupies a volume of 0.25m³. at this point, the piston rests on a set of stops. if a pressure of 200 kpa is required to move the piston from its position on the stops, determine the amount of heat in transferred to the air, in kj, for the air temperature to rise a final temperature of 700 k (from the initial conditions). assume air has constant specific heats evaluated at 300 k.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

The two required components for a generator are

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.