Multiple !

if you had two identical magnets and put them together so that one of the south poles was in contact with the other's north pole, what would you have?
a. one magnet with a stronger north pole
b. one magnet with a stronger south pole
c. one magnet with a north pole and a south pole
d. no magnet since the two smaller magnets would lose their magnetism when combined to form a larger magnet

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%)