A 4.6-kg Amazon box on a smooth circular ramp has a velocity of 4.5 m/s . If the ramp has a radius of 1.2m calculate the angle thetha which represents the maximum angle that package begins to leave the surface of the smooth circular ramp using the kinematic relationship between tangential acceleration a(t) and the speed of the package to find the solution.

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain