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Air enters a counterflow cooling tower at a rate of 100 m3/s at 30 degree C dbt and 40% relative humidity. Air leaves at the top of the tower at 32 degree C and 90% relative humidity. Water enters the tower at 35 degree C and the water flow rate is 1.2 times the mass flow rate of air. Make-up water is supplied at 20 degree C. What arc the range and approach of the tower? At what rate is heat absorbed from the load by the stream of water on its way back to the top of the tower? What percentage of the water flow rate must be supplied as make-up water to replace the water evaporated into the air stream?
an impeller provides 20 kj of work to the air contained in a 0.15 m3 rigid volume initially at 200kpa and 10degc.
The motion of a particle in defined by the relation x = t3 - 15 t2 - 20, where ‘x' is expressed in metres and ‘t' in seconds. Determine the acceleration of the particle at t = 3 seconds.
an electric motor weighing 750 lb and running at 1800 rpm is supported on four steel helical springs each having eight
wind is blowing on a 55-gallon drum. estimate the wind speed needed to tip the drum over. work in si units. the mass of
assuming mass of block a 5kg mass of block b 10 kg mass of block c10kg. the coefficent between a and c and
A 12 Volt battery is charged by supplying 3 Amps over a period of 6 hours. What is the change of energy stored in the battery if the battery loses 400kJ of heat during charging.
a torque t is applied to a thin-walled tube of a cross section in the form of a regular hexagon of a constant wall
an explosion occurs on a cold day -30 c at a certain distance. if it takes 0.9 times as long on a warmer day to hear
a rubber cylinder of diameter d is compressed inside a steel cylinder by a force f. a obtain a formula for the lateral
for a first order system with a transfer function of 15s2 given a unit step input pleasea. derive the transfer function
vector a has components ax 1.24 ay 2.21 vector b has components bx 4.06 b-y -3.66. find the counterclockwise angle
the system shown starts from rest and each component moves with a constant acceleration. if the relative acceleration
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