Arefrigerator is to remove heat from the cooled space at a rate of 300 kj/min to maintain its temperature at 288c. if the air surrounding the refrigerator is at 258c, determine the minimum power input required for this refrigerator.

Air enters a compressor operating at steady state at 1.05 bar, 300 k, with a volumetric flow rate of 93 m3/min and exits at 12 bar, 400 k. heat transfer occurs at a rate of 15.5 kw from the compressor to its surroundings. assuming the ideal gas model for air neglecting kinetic potential energy effects, determine the power in put in kw.

Will you chech and finish these for me, because i am stumped with them.

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door