10. A worker is currently exposed to two coexisting sources of noise during an 8-hour work shift, one at 85 dBA and the other at 87 dBA. The noise results from two turbines located near the worker. A proposal has been made to install a third turbine that will expose the worker to an additional noise source of 91 dBA, but only for two hours of the 8-hour shift. (a) Determine the noise dose of these three noise sources. (b) The noise level from the third turbine must be reduced to satisfy OSHA standards. To what dBA level must the noise level of the third turbine be reduced in order to satisfy OSHA noise dose requirements

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.