In March 2025
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An air compressor has an inlet air enthalpy of 35 Btu/lb and an exit enthalpy of 70 Btu/lb. The mass flow of air is 3 lbs/s. If heat loss is 466.62 Btu/min, find the work input to the compressor.
During a steady flow process, the pressure of the working substance drops from 180 psia to 30 psia, the speed increases from 210 fps to 1050 fps, the internal energy of the open system decreases 30 Btu/lb, and the specific volume increases from 2 to 10 ft3/lb. Heat loss is 20 Btu/lb. Determine the horsepower for 12 lb/min mass flow.
During a steady flow process, the pressure of the working substance drops from 180 psia to 30 psia, the speed increases from 210 fps to 1050 fps, the internal energy of the open system decreases 30 Btu/lb and the specific volume increases from 2 to 10 ft3/lb. Heat loss is 20 Btu/lb. Determine the horsepower for 12 lb/min mass flow.
A pendulum makes 90 vibrations in a minute.
a.) Find the period T in seconds.
b.) What is its frequency?
Vectors A and B are shown in the figure. Vector C is given by C = B - A. The
magnitude of vector A is 16.0 units, and the magnitude of vector B is 7.00 units. What
is the angle of vector C, measured counterclockwise from the tx-axis?
O A. 73.1°
O B. 22.4°
O C. 16.9°
O D. 292°
O E. 287°
A solar powered heat engine designed to receive heat from a solar collector plate and rejects heats to the surrounding atmosphere that is at 30 °C. When a concentrating collector is used the plate operate at a surface temperature of 250 °C while when a flat plate collector is used the plate has an operating temperature at 90 °C. From experiments, it was found that for the concerned location the maximum possible solar heat received is about 1880 kJ/m2 h. Find the change in minimum area required for a change from flat plate to concentrating collector if in both cases the heat engine need to generate 1 kW of useful shaft power
Air is compressed by a rotary compressor in a steady flow process at a rate of 1.5 0 kg/s. At entry, the air has a specific volume of 0.900 m3/kg and has a velocity of 80.0 m/s. At exit, the air has a specific volume of 0.400 m3/kg and has a velocity of 45.0 m/s. In its passage through the compressor, the specific enthalpy of the air is increased by 110.0 kJ/kg and it experiences a heat transfer loss of 20.0 kJ/kg.
A 10-ft diameter by 15-ft height vertical tank is receiving water (p = 62.1 lb/cu ft) at the rate of 300 gpm and is discharging through a 6-in ID line with a constant speed of 5 fps. At a given instant, the tank is half full. Find the water level and the mass change in the tank 15 min. later.
a sample nitrogen gas undergoes an adiabatic expansion. The initial pressure and volume of the gas is 4.00 atm and 14.0 L. The final volume is 30.0L. If there are 2 moles of gas, determine the following
