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Your friend, a 75 kg mountain climber is suspended from a cliff by a rope. Calculate the tension in the rope, in Newtons, when you lift your friend to safety. If the rope can withstand 1.25 kN of stress per square centimeter of cross-sectional area, what minimum diameter of rope (cm) is needed so that your friend does not fall into the abyss? What factor of safety would you want to apply to this diameter to be very, very sure that this rope will not break (1.5x 2x, 3x, 10x, 100x, 1000x)?
consider a shell and tube heat exchanger which is used to heat water cp water 4.33kjkgk from 10 deg c to 85 deg c
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The compression strength of Kevlar 49 fiber is about one-eight of its tensile stress. Estimate the smallest diameter of a rod on which 12 um diameter Kevlar fiber can be wound without causing kinks on its compression side.
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