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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.
If the curve were not banked, what would be the minimum coefficient of friction between tires and road that would keep traffic from skidding out of the turn when traveling at 85 km/h?
particle 1 is subjected to an acceleration a-kv particle 2 is subjected to a-kt and particle 3 is subjected to a-ks.
At a given instant in time, flywheel OA is caused to rotate with angular velocity of w=2rad/sec and angular acceleration of alpha=6rad/s2. determine the angular velocity of links AB and BC at this instant in time. AB=.5m, BC=.4m, OA=.3m
two humid airstreams are adiabatically mixed at 1atm pressure to form a third stream. the first stream has a
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If the crest of a hill has a radius of curvature i = 200ft, determine the maximum constant speed at which the car can travel over it without leaving the surface of the road. Neglect the size of the car in the calculation. The car has a weight of 3500..
A certain balloon is constructed of a material such that the pressure inside is related to the volume according to the relation PV^(-2/3)=constant. The balloon contains 2kg of ammonia initially at 0C, 60% quality. The balloon is now heated until the ..
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