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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.
a 1.5 ton crate is hoisted by three steel wires. each wire is 1/4 in. in diameter and each carries one-third of the load. determine the stress in the wires.
At steady state, air at 200 kPa, 325 K, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross sectional areas. The inlet cross sectional area is 6 cm squared. At the duct exit, the pressure of the air is 100 kP..
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Cobalt has a saturation magnetization of 1.4*10^6 A/m, and an atomic volume of 6.7 cm^3/mole. (a) What is the magnetic dipole moment of each cobalt atom in Bohr magnetons? (b) You apply a magnetic field in the easy direction with a coil of 10 turns p..
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