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A standardized procedure is expected to produce washers with very small deviation in their thicknesses. Suppose that 10 washers were chosen and measured. If the thicknesses of these washers were in inches, 0.123,0.124,0.126, 0.120, 0.130,0.133, 0.125, 0.128, 0.124, 0.126. What is a 90 percent confidence interval for the standard deviation of the thickness of a washer produced by this procedure?
A state runs a lottery in which 6 numbers are randomly selected from 40, without replacement. A player chooses 6 numbers before the state's sample is selected.
Determine an expression for the number of cycles to failure, Nf if the initial crack size is a0. State any assumptions you make.
Show that the total true strain is the sum of the true strains in each step, that is the true strains are additive. Show that using engineering strains, the strain for each step cannot be added to obtain the total strain.
a 10-lb block is attached to an unstretched spring of constant k12lbin. the coefficients of static and kinetic friction
Steam enters a diffuser at 20 psia and 240oF with a velocity of 900 ft/s and exits as saturated vapor at 240oF and 100 ft/s. The exit area of the diffuser is 1 ft2. Determine (a) the mass flow rate of steam and (b) the rate of entropy generation.
how do you solve for the stresses acting on a perimeter point centered on the y axis the force is applied parallel to
What are the percentages of the total heat absorption taking place in the economizer, boiler drum and the superheater, respectively? Assume cp of air and water as 1.005 kJ/kg K and 4.2 kJ/kg K, respectively.
Consider a thermal energy reservoir at 1500 K that can supply heat at a rate of 150,000 kJ h-1. Determine the exergy of this supplied energy, assuming an environmental temperature of 25 oC.
Drinking water at 10oC for an office complex must be pumped along a horizontal section of PVC pipe 50 m long at 2 m/s. The pipe has a nominal diameter of 62.5 mm and is Schedule 40. What is the head loss in m?
Use cold air properties to find the highest cycle pressure, the specific energy added by combustion, and the mean effective pressure.
the rigid gate oab shown in the figure below is hinged at o and rests against a rigid support at b. what minimum
Consider a cylindrical titanium wire 3.0 mm in diameter and 2.5 x 104 mm long. Calculate its elongation when a load of 500N is applied, assuming that the deformation is totally elastic.
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