Ahelical compression spring is required to provide a minimum force of 80 n at installation and have a working deflection of 25 mm. the spring rate is 35 n/mm. the coil must fit in a 50 mm diameter hole with 2.5 mm clearance. the spring has squared and ground ends and is made from astm a227 4.0 mm diameter wire, without presetting. using a 15% clash allowance, find: - (i) the number of coils required; and (ii)the free length of the spring.

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.