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The service life of a battery used in a cardiac pacemaker is assumed to be normally distributed. A random sample of 10 batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lifetimes (in hours) are obtained: 25.5, 26.1, 26.8, 23.2, 24.2, 28.4, 25, 27.8, 27.3, and 25.7. a) The manufacturer wants to be certain that the mean battery life exceeds 25 h. What conclusions can be drawn from these date (use alpha = 0.05)? b) Construct a 90% two-sided confidence interval on mean life in the accelerated test. c) Construct a normal probability plot of the battery life data. What conclusions can you draw?
Determine maximum total bending moment (static plus dynamic) of the beam under steady-state conditions.
A metal is being cast into a cylinder which is 10 cm in diameter and 20 cm tall. The mold is bottom-gated (see class notes for geometry)
Cortical bone gets weaker with aging, but it turns out that diaphyseal diameters can also change with aging, particularly in males, such that the safety factor of the diaphysis is approximately constant with aging.
does the atmospheric pressure inside of a tube aproximately a half an inch in diameter cause resistance against an end
one axis of a rrl robot is a linear slide with a total range of 950mm. the robotrsquosnbspcontrol memory has a 10 bit
what is the type of analog anti aliasing filter in DSA HP3566a? is that butterworth, chebyshev, inverse chebyshev or elliptic? and what order of that filter? thanks very much.
what kind of metals are often recommended for use at low temperatures particularly when any sudden loading of the part
an 8-kg plunger is released from rest in the position shown and is stopped by two nested springs the constant of the
Hollow shaft transmitting power with shear limits. Design a hollow steel shaft to transmit 300 hp at 75 rpm without exceeding a shear tress of 8000 psi. Use 1.2:1 as the ratio of the outside diameter to the inside diameter.
measuring fracture toughnessthe aim of this demonstration is to use measurements of the load required to propagate a
Calculate the overall heat transfer coefficient between the air and the water (answer in W/m^2K).
question a soap bubble with walls 398 thick floats in air. if this bubble is illuminated perpendicularly with sunlight
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