A120-cy/hr maximum output pump is used to place the concrete for a 200-cy slab. the concrete is supplied by 8-cy transit-mix trucks arriving at the site in 12-min intervals. the concrete batch plant is located 5 miles from the site. average truck speed is 30 mph. each transit-mix truck takes, on average, 10 min to discharge. the placement crew size is seven workers. average worker output is 5 cy of concrete per hr. if additional trucks are added the time to place the concrete will decrease

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.