What is the equation x and y together y=[ ]x

An engine runs on the ideal diesel cycle. the cycle has a compression ratio of 20 and a cutoff ratio of 2. the highest temperature in the cycle is 1200 k. if the heat into the system is 300 kj/kg of working fluid and using variable specific heats determine the work produced per mass of working fluid

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?