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Four pounds of air is compressed in a cylinder-piston arrangement while the temperature remains constant at 70°F. If the initial pressure is 30 psi absolute, calculate the work needed to compress the air such that the absolute pressure doubles. Also calculate the heat transfer.
estimate the volume of adhesive wear to expect from an hb270 steel shaft of 40-mm dia rotating at 250 rpm three 8-hour
A fan accelerates air (at atmospheric pressure and 300K) from a rest to 5m/s. The fan mass flow rate of air is 1.2 kg/s. What is the minimum amount of power this fan must consume to operate under these conditions?
Consider a two- dimensional, straight triangular fin of Length L= 50mm and base thickness t= 20mm. The thermal conductivity of the fin is k= 25 W/mK. The base temperature is T_b= 50 degrees Celsius, and the fin is exposed to convection conditions cha..
Steam at 550 lbf/in.2, 70 oF enters a turbine operating at steady state and exits at 1 lbf/in.^2. The turbine produces 500 hp. For the turbine, heat transfer is negligible as are kinetic and potential energy effects. Determine the quality of the stea..
the motion of a particle is defined by the relation 2t3-9t212t10 where x and t are expressed in feet and seconds
the initial temperature is 152o c. air expands as an ideal gas from 10 bar and the above temperature to 1 bar in
In a dairy plant, milk at 4°C is pasteurized continuously at 72°C at a rate of 12 L/s for 24 h a day and 365 days a year. The milk is heated to the pasteurizing temperature by hot water heated in a natural-gas-fired boiler that has an efficiency o..
Find (a) the heat transfer by radiation to the window; (b) the heat transfer by natural convection to the window; and (c) the fraction of heat transferred to the window by radiation.
a gas is contained in a vertical piston-cylinder arrangement. the 50-lbm piston initially rests on the bottom stops.
a heat pump cycle operates between a geothemial reservoir and your house. the cycle requires 200 kw to operate with a
Capacitors C1=12micro Farad and C2=28microFarad are each charged to 15V , then disconnected from the battery without changing the charge on the capacitor plates. The two capacitors are then connected in parallel, with the positive plate of C1 connect..
The plain concrete beam shown having a rectangular cross section 10-in. wide and 18-in. deep is simply supported on a single span of 20 ft. Find the bending stresses that exist at mid span.
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