The mechanical tachometer measures the rotational speed n of the shaft by the horizontal motion of the collar b along the rotating shaft. this movement is caused by the centrifugal action of the two 12-oz weights a, which rotate with the shaft. collar c is fixed to the shaft. determine the rotational speed n of the shaft for a reading β = 15°. the stiffness of the spring is 4.5 lb/in., and it is uncompressed when θ = 0 and β = 0. neglect the weights of the links.

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.