The central perpendicular axis through the ring is a z axis, with the origin at the center of the ring. what is the magnitude of the electric field due to the rod at (a) z ! 0 and (b) z ! & ? (c) in terms of r, at what positive value of z is that magnitude maximum? (d) if r ! 2.00 cm and q ! 4.00 mc, what is the maximum magnitude?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)