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A steel strip emerges from the hot roll section of a steel mill at a speed of 20 m/s and a temperature of 1200 K. Its length and thickness are L = 100 m and δ = 0.003 m, respectively, and its density and specific heat are 7900 kg/m3 and 640 J/kg · K, respectively.
Accounting for heat transfer from the top and bottom surfaces and neglecting radiation and strip conduction effects, determine the time rate of change of the strip temperature at a distance of 1 m from the leading edge and at the trailing edge. Determine the distance from the leading edge at which the minimum cooling rate is achieved.
Derive an expression for the heat loss conductance Uc for a flat-plate collector in which convection and conductance are completely eliminated in the air layers by use of a hard vacuum.
A punch press, used for stamping sheet metal, has a punching capacity of 50 kN. The section ofthe frame is as shown in Fig. Find the resultant stress at the inner and outer fibre of the section.
Suppose a system employs devices that are each capable of storing a list of 50 CRL entries. How can this design decision lead to security problems?
a six-cylinder four-stroke spark-ignition engine operating on the ideal otto cycle takes in air at 14 psia and
learning goal to determine cartesian force components from magnitude and determine position and resultant vectors by
air at 640k and 8 bar is expanded through a turbine to a final temperature of 350k. what is the work done for 1kg of
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An accelerating car develops 15 kW at a speed of 30 km/h on a level roadway, when towing an identical vehicle whose engine is out of action. Find the tension in the towrope at this speed, if each car has a constant attractive resistance of 650 N
a floating cone with tip angle 60 degrees has. mass of m1300kg is placed in sea water with density rho 1025kgm3. on top
1. compute percent ionic character of gallium phosphide gap.2. what types of bonding would be expected for the
a capacitor is connected to an ac generator that has a frequency of 3.7 khz and produces a voltage of 1.4 v. the
Determine the minimum and maximum local membrane temperatures for top and bottom flows that are in the same, opposite, and orthogonal directions. Which flow configuration minimizes the membrane temperature?
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