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Spherical steel balls of diameter D 10 mm are cooled from an initial temperature of Th,i 1000 K by submersing them in an insulated oil bath initially at Tc, i 300 K. The total mass of the balls is mh 200 kg, while the mass of oil is mc 500 kg. The convection coefficient associated with the spheres and the oil is h 40 W/m2 · K, and the steel properties are kh 40 W/m · K, ph 7800 kg/m3, and ch 600 J/kg · K. Determine the steady-state ball and oil temperatures, and the time needed for the balls to reach a temperature of Th, f 500 K.
a steam rankine cycle operates between pressure limits of 2500 psia in the boiler and 1psia in the condenser. the
The GE J-79 turbo jet produces a thrust of 10,000lbs at sea level. The inlet diameter is 3.19 ft. If an airplane equipped with the J79 is flying at standard sea level with a velocity of 1,000 ft/sec, estimate the jet velocity relative to the airplane..
A steam turbine operating at steady state produces 6,000 hp with a heat transfer to the surroundings at a rate of 360,000 Btu/hr. Steam enters at 600 0F, at 200 psi and exits as a saturated vapor at 8 psi. Neglecting the KE and PE determine the volum..
air flows on both sides of a counterflow heat exchanger operating at steady state with a mass flow rate of 1 lbs on
argon at 2mpa and 500oc enters an isentropic turbine. the temperature of argon at the outlet is 20oc. determine the
An object initially at an elevation of 5 m relative to the Earth's surface with a velocity of 50 m/s is acted on by an applied force R and moves along a path. Its final elevation is 20 m and its velocity is 100 m/s. The acceleration of gravity is 9.8..
A helical compression spring is wound using QQ&T A229 wire. The spring is needed to support a 25-lbf load after being compressed 1.5 in. Because of assembly considerations, the solid height cannot exceed 1.5 in and the free length cannot be more than..
Saturated liquid water is kept in a piston-cylinder-weight assembly at 100 kPa. Heat is added from a reservoir at 120 C so that saturated vapor is formed. Estimate the absolute availabilities in kJ/kg of saturated liquid and vapor.
consider an air-standard otto cycle and a modified cycle in which the isentropic compression and expansion processes
Sketch Bode plots for the following systems. Use asymptotes, but locate at least one point in the Magnitude plot and make sure to calculate zeta for complex peaks.
water in 50 liter rigid container is initially at 500 kpa and 350 degree c. as the result of heat transfer the water
consider the power system as designed below. the duty fluid is water and has a mass flow 0.75 kg s and all piping
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