a plane inclined at an angle of 30° to the horizontal has an efficiency of 50%. the force parallel to the plane required to push a load of 120N uniformly up the plane is?

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.