Zinc is to be electroplated onto both sides of an iron sheet that is 20 cm2 as a galvanized sacrificial anode. It is desired to electroplate the zinc to a thickness of 0.025 mm. It is found that a current of 20 A produces a zinc coating of sufficient quality for galvanized iron. Determine the time required to produce the desired coating, assuming 100 % efficiency.
What will be an ideal response?
Equation 10.15b applies to this problem. The current is given, and the weight of material needed is calculated from the density and volume of material. All other terms in Equation 10.15b are then known except the time required.
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Indicate whether the statement is true or false
A hollow circular post ABC (see figure) supports a load P1 = 16 kN acting at the top. A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB = 30 mm, tAB = 12 mm, dBC = 60 mm, and tBC = 9 mm, respectively. The lower part of the post must have the same compressive stress as the upper part. The required magnitude of the load P2 is approximately:
(A) 18 kN
(B) 22 kN
(C) 28 kN
(D) 46 kN
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Scientists today do not accept the Ptolemaic model because:
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