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A 4-ft concrete post is reinforced with four steel bars, each with a 3/4 in. diameter. Knowing that E of steel= 29x10^6 psi and Eof concrete= 3.6x10^6 psi.
An alloy named "Cylon" is composed of 25 wt.% of metal A and 75 wt.% of metal B. If the densities of metals A and B are 6.17 and 8.00g/cm^3, respectively, whereas their respective atomic weights are
Consider two reversible refrigerators operating in series. Determine the temperature (°C) of the intermediate reservoir.
Carbon dioxide passing through a heat exchanger at a rate of 100kg/hr is cooled down from 8000C to 500C. Write the steady flow energy equation.
The air enters at 350 C and 0.1 MPa at a rate of 2 kg/s. Determine the heat transfer rate between the two fluids (kW) and the exit temperature (C) of the air.
5m3 of air at 2bar, 270C is compressed up to 6bar pressure following PV1.3 = constant. It is subsequently expanded adiabatically to 2 bar. Considering the two processes to be reversible, determine
One mole of an ideal gas at 1.0 Mpa and 300K is heated at constant pressure till the volume is doubled and then it is allowed to expand at constant temperature till the volume is doubled again. Cal
A reversible heat engine operating a 1500 F source and the atmosphere at 0 F produces work to drive a reversible heat pump. Determine the heat transfer rate (kBtu/hr) to the home.
A circular shaft subjected to a repeated axial tensile load of 25KN. The shaft is made from AISl 4140 OQT 1100 steel. Determine the design factor at the hole and at the fillet.
Stray heat transfer with the surroundings and changes in kinetic and potential energy are negligible. What is the power required by the pump?
Assuming the air behaves as an ideal gas with cv= 0.72 kJ/kg-K, find (a) the mass of the air, (b) the final temperature of the air, and (c) the entropy produced.
Calculate the exergies of two closed systems, respectively; 1 kg of steam at 800 kPa and 180 °C, and 1 kg of R-134a at 800 kPa and 180°C. Which has the capability to produce the most work i
The tanks are connected by a siphon (with diameter=25 mm) that reaches a height of 2.5 meters from the common ground (.5 m meters higher than the surface of Tank A and 1.5 meters higher than the sur
Consider the 2-dimensional flow field for which u=Axy, v=By^2, where A=1m^-1 x s^-1, B=-0.5m^-1 x s^-1, and the coordinates are measured in meters.
Consider an ideal combined cycle with compression ratio of 7:1 in which air enters the compressor at 295 K, enters the turbine at 1200 K, and exits the heat exchanger at 400 K.
The exit speed and pressure is 32 m/s and stmospheric, respectively. Calculate the horizontal component of the force transmitted by the coupling between the nozzle and hose.
The heat exchanger effectiveness is 75%. Use a heating value for kerosene of 45,840 kJ/kg. What is the engine specific fuel consumption?
A round casting is 0.1 m in diameter and .5 m in length. What is the difference in the solidification time of the two castings?
Find the maximum thermal efficiency of this heat engine (62.1%). Determine whether this engine can produce its desired power output (no).
The maximum temperature is 800*C, and the turbine has a total power output of 5 MW. Find the fraction of the extraction flow to the FWH and the total condenser heat transfer rate.
An annual maintenance and operation cost of $27,000 and a $50,000 salvage value. Which should be selected on the basis of a future worth comparison at an interest rate of 15% per ye
A Steady flow centrifugal compressor is supplied with saturated water vapor at 15kPa and 500kg of the water is compressed per hour to 250kPa, 400C. Determine the power required to compress the water
Heat in the amount of 190kJ is transferred directly from an energy-source at 790K to an energy-sink at 2065K. Prove that this violates the increase of entropy principle, as it must according to Cla
Find the reheat temperature so the turbine output is satured vapor. 1) Find the total turbine power output 2) Find the heat transfer into the boiler.
A investor offers to purchase the lease for a single payment of $174,642 payable 10 years from the present. Find the IRR on this investment.