Refrigerant 134a with a mass flow rate of 50 lbm/min enters an insulated compressor with a quality of 100% and a pressure of 30 psi, and exits at 160 psi and 130 °f. neglecting kinetic and potential energy effects, determine: (i) isentropic power input (btu/s) (ii) actual power input (btu/s) (iii) compressor efficiency

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed