A small object carrying a charge of -7.00 nC is acted upon by a downward force of 23.0 nN when placed at a certain point in an electric field. A. What are the magnitude and direction of the electric field at the point in question?
B. What would be the magnitude and direction of the force acting on a proton placed at this same point in the electric field?

An air standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes. 1-2 isentropic compression 100 kpa and 22°c to 600 kpa 2-3 v=constant heat addition to 1500 k 3-4 isentropic expansion to 100 kpa 4-1 p=constant heat rejection to initial state (a) show the cycle on p-v and t-s s (b) calculate the net work output per unit mass (409 kj/kg) (c) determine the thermal efficiency (47.9%)