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Calculate the range of allowable currents in Problem 31.43 if the temperature should be between 0.7 and 0.8 times the melting temperature of copper. Repeat this problem for carbon steel.
Problem 31.43
Two flat copper sheets (each 1.0 mm thick) are being spot welded by the use of a current of 7000 A and a current flow time of 0.3 s. The electrodes are 4 mm in diameter. Estimate the heat generated in the weld zone. Assume that the resistance is 200 μ Ω .
Any heat transfer is with a constant-temperature source, which is at 60?C. Find the polytropic exponent n and show that this process satisfies the entropy equation.
Write an analysis of the building attached. Write down everything you notice: form, material, color, space and volume, and proportion and scale. Identify the use (school building) and its historical period and style.
A signal approach has 20 seconds of displayed green, 4 seconds of yellow, and 3 seconds of all red (assume typical start-up, lost time, and clearance time). The cycle length is 60 seconds.
Make a detailed drawing of a Woodruff key connection between a shaft and the hub of a gear The shaft has a diameter of 1.500 in. Use a no. 1210 Woodruff key. Dimension the key seat in the shaft and the hub.
The depth of water, H, behind a gravity dam is normally distributed with a mean of 100' and variance of 2,500 ft2. The total hydrostatic pressure against the dam is F=?H2/2, where ? is the unit weight of water (62.4 pcf).
How would you structure a portion of an Aviation Safety program for a commercial airline or government agency. Briefly describe one or two safety problems and why it is a serious safety problem.
What additional information concerning the application and polymer properties do you
Use this result to estimate the attenuation distance of light in water
How many kg/day of NaOH must be added to neutralize a waste stream generated by an industry producing 90.8 million g/day of sulfuric acid, if 0.1% of the sulfuric acid produced is lost to wastewater The wastewater flow is 750,000 L/day
An offshore drilling rig is being towed out to sea. What is the maximum distance away that the navigation lights can still be seen by an observer standing at the shoreline? The observer's eye height is 5'6" and the uppermost navigation light is 168 a..
If the difference in weight between the two baskets must greater than 15 lb they will not have the strength to operate the pulley. The King weighs 195 lb, the princess weighs 105 lb, and the prince weighs 90 lb.
A jet plane flies at an altitude of 40 000 ft where the air is at -40 F, 6.5 psia, with a velocity of 625 mi/h. Find the Mach number and the stagnation temperature on the nose.
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