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1. A steel bar, 20 mm in diameter and 200 mm long, with an emissivity of 0.9, is removed from a furnace at 455°C and suddenly submerged horizontally in a water bath under atmospheric pressure. Estimate the initial heat transfer rate from the bar.
2. Electrical current passes through a horizontal, 2-mm- diameter conductor of emissivity 0.5 when immersed in water under atmospheric pressure.
(a) Estimate the power dissipation per unit length of the conductor required to maintain the surface temperature at 555°C.
(b) For conductor diameters of 1.5, 2.0, and 2.5 mm, compute and plot the power dissipation per unit length as a function of surface temperature for 250 Ts 650°C. On a separate figure, plot the percentage contribution of radiation as a function of Ts.
the uniform disk of mass m and radius r rotates about the pin at c located a distance d from its center. determine d so
Replicate a long position in this forward contract with a portfolio of stock and T-bills, giving details on the initial position as well as the trade resolution in 6 months.
We need to design a piping system that transports 35ft^3/s of water 100ft. The available head is 7ft. The pipe is to be made out of a rough concrete material. Find the necessary diameter for the pipe.
Methane is completely burned with 20% excess air, with 30% of the carbon going to CO. What is the partial pressure of the CO in the stack gas if the barometer reads 740 mm Hg, the temperature of the stack gas is 300°F.
a 14 scale model of a tractor trailer is tested in a wind tunnel under standard sea level conditions. the model
an open gas turbine is equipped with a regenerator. the compressor is 87nbspefficient with air entering the compressor
Water flowing at a rate of 3.8 kg/s is heated from 38 to 55 C in the tubes of a shell and tube heat exchanger. The shell side is one pass with water flowing at 1.9 kg/s entering at 94 C. The overall heat transfer coefficient is 1420 W/m^2*K. The aver..
A centrifugal compressor has an impeller tip speed of 366 m/s. Determine the absolute Mach number of the flow leaving the radial vanes of the impeller when the radial component of the velocity at impeller exit is 30.5 m/s and the slip factor is .9. G..
the external torque on a drill bit varies as a quadratic function qx2l2 to a maximum intensity where q 100 in.lbin. if
the 5-kg rm kg cylinder is suspended from two equal-length cords. the end of each cord is attached to a ring of
Two well-insulated tanks filled with carbon monoxide (CO) gas are connected by a valve. In tank A, 1 kg of gas is stored at 100 kPa and 300 K. In tank B, 5 kg of gas are stored at 500 kPa and 870 K. The valve is opened, and the contents of the two ta..
saturated water vapor at 13.32 bar enters an insulated throttling valve which drops the pressure to 1.50 bar. determine
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