Mass spectral measurements were made on 10 replicate low concentration Pb-EDTA samples: 190.5 190.5 , 146.2 146.2 , 160.9 160.9 , 175.9 175.9 , 144.9 144.9 , 214.3 214.3 , 165.9 165.9 , 170.5 170.5 , 159.9 159.9 , and 177.5 177.5 counts. Ten measurements of a blank had a mean measurement of 44.3 44.3 counts. A sample containing 3.00 3.00 μM Pb-EDTA gave a measurement of 1777 1777 counts. Estimate the signal and detection limit for Pb-EDTA.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.