The vendor begins using heavier packaging, which increases the weight of each package by 50 g.
a. How does this affect the mean weight of the packages?
b. How does this affect the standard deviation of the weights?
(a) The mean will increase by 50 g.
(b) The standard deviation will be unchanged.
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PROBLEM 2.42 A steel tube (E = 200 GPa) with a 32-mm outer diameter and a 4-mm wall thickness is placed in a vise that is adjusted so that its jaws just touch the ends of the tube without exerting any pressure on them. The two forces shown are then applied to the tube. After these forces are applied, the vise is adjusted to decrease the distance between its jaws by 0.2 mm. Determine (a) the forces exerted by the vise on the tube at A and D, (b) the change in length of portion BC of the tube.
Which of the following are characteristics of Scotch marine boilers? Select all that apply.
A) They are low profile. B) They respond well to stable loads. C) They are condensing design. D) They are water tube design
Which of the following is true of the vertical weld?
A. It is the most common out-of-position weld. B. The more vertical the sheet, the easier the weld is to make. C. Welding on a sheet at a 45 degree angle requires as much skill as a 90 degree angle. D. The speed of the manipulation is faster when the sheet is at 45 degree angle.
Which of the following is used when there is not enough space for straight-line backing?
A. sight-side backing B. alley-dock backing C. offset backing to the left D. offset backing to the right