Groundwater is depleted as it is pumped out from wells for drinking. It is replenished by the process of infiltration. An 800-acre area that receives 52 in./y of precipitation is developed from wild grassland with a runoff coefficient of 0.18 into a subdivision with: Runoff coefficient Area Type 300ac Grassy land 0.20 200 ac Pavement 0.75 300 ac Residentia 0.40 With the loss of vegetation, evapotranspiration is reduced from 24 in./y to 18 cm/y. As a result of the development, what is the change in the annual volume of rainwater (in gallons) that infiltrates to become groundwater? Assume no annual change in storage.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

On a average work day more than work place firs are reorted

How much power could a wind turbine produce if it had the following specifications? cp = 0.45 -d=1.2kg/m3 d=50m v 5m/s