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A fan at a rock concert is 27 m from the stage, where the sound intensity level is 130 dB. Her eardrums have a diameter of 9.52 mm. How much energy is transferred to each eardrum in one second?
Consider a thermal energy reservoir at 1500 K that can supply heat at a rate of 150,000 kJ h-1. Determine the exergy of this supplied energy, assuming an environmental temperature of 25 oC.
air at 80 kpa 300 k and 250 ms enters a diffuser at a rate of 2.5 kgs and leaves at 315 k. the exit area of the
a tank of 50 ft3 volume contains saturated ammonia at a pressure of 200 lbfin2. initially the tank contains 50 liquid
a gaseous fuel has the following volumetric analysis 90 methane ch4 5.0 ethane c2h6 and 5nitrogen. it bums in a steam
consider an ideal simple gas turbine cycle. for a net power output of 10000 horse power an inlet air temperature of
a large storage tank contains 500000 l of milk. milk enters the tank through a 0.05 m diameter pipe at a velocity of 3
a r-12 plant is to develop 5 tons of refrigeration. the condenser and evaporator temperature are to be 40c and -10 c
a uniform rectangular cabinet having dimensions shown and mass m=50kg is placed onto a cart of mass 10 kg as shown. no slipping between cabinet and cart. determine the maximum allowable force P so that the cabinet does not tip.
heat amp mass transfer incropera 6th ed prob. 5.68 asphalt pavement may achieve temperatures as high as 50 degree
carbon dioxide is expanded in a steady flow frictionless process through a turbine from 0.9 mpa to 0.1 mpa. the initial
a 25-hp 240-v 77.8-a shunt motor has an armature resstence of 0.083 ohms and a field-circuit resistance of 125 ohms.
in the production of ethanol from corn the solids left after fermentation are dried in a continuous-flow oven. this
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