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An exercise room has eight weight-lifting machines that have no motors and four treadmills each equipped with a 2.5-hp (shaft output) motor. The motors operate at an average load factor of 0.7, at which their efficiency is 0.77. During peak evening hours, all 12 pieces of exercising equipment are used continuously, and there are also two people doing light exercises while waiting in line for one piece of the equipment. Assuming the average rate of heat dissipation from people in an exercise room is 525 W determine the rate of heat gain of the exercise room from people and the equipment at peak load conditions.
on a hot summer day a student turns his fan on when he leaves his room in the morning. when he returns in the evening
boron is diffused into highly pure germanium at 1000oc q 105 kcalmol do 1.1 x 10 m2sec. a steady surface
Air undergoes an isentropic process from P_1 = 100 kPA and T_1 = 300 K to a final state where the temperature is 700 K. Assuming an ideal gas, find P_2 using both the ideal gas tables and assuming a constant specific heat ratio at the average tempera..
it is desired to store 5 kg of o2 in a 30 liter tank at-106.5degc. to design the tank we need to determine the pressure
a cross section of a rotating bearing is shown. the spherical member rotates with angular speed omega a small distance
from time t0 to t5 hr radioactive steam is released from a nuclear power plant located at x -1 mile and y 3 miles.
A pole-vaulter is holding the vaulting pole parallel to the ground. the pole is 5 m long. The vaulter grips the pole with his right hand at the top end of the pole and with his left hand 1 m from the top end of the pole. the mass of the pole is 2.5 k..
A high-strength cast-iron bar 8 in. in diameter is being turned on a lathe at a depth of cut d=0.050 in. The lathe is equipped with a 15-hp electric motor and has a mechanical efficiency of 80%. The spindle is 500 rpm. Estimate the maximum feed that ..
air is blowing out of a fan with exit diameter d 0.5 m with uniform velocity v 100 ms static pressure p 100000 pa and
airplane takeoff from an aircraft carrier is assisted by a steam driven pistoncylinder device with an average pressure
A vessel, divided into two parts by a partition, contains 6 mol of N2 gas at 65oC and 30 bar at one side of the partition and 5 mol of Ar at 140oC and 20 bar on the other. If the partition is removed and the gases mix adiabatically and completely, wh..
The inlet and outlet air temperature of a centrifugal flow compressor are 70oF and 120oF respectively (See Figure 1). The air flow steadily at a mass flow rate of 24 lbm/min. If the compressor is adiabatic, determine the rate of work at which the air..
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