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The fracture strength of glass may be increased by etching away a thin surface e layer. It is believed that the etching may alter the surface crack geometry (i.e. reduce crack length and increase the tip radius). Calculate the ratio of the original and etched crack tip radii for a eight-fold increase in fracture strength if two/ thirds of the crack length is removed.
A wooden board AB, which is used as a temporary prop to support a small roof, exerts at point A of the roof a 57-lb force directed along BA. Determine the moment about C of that force.
a rigid well-insulated tank with a volume of 3 fe contains air at p1 22 lbfin2 and t1 475 bullr. the air is stirred by
a useful figure of merit comparison between batteries that have the same voltage is the ampere-hour ah rating. for
A 7 kg cylinder is attached to a series of two springs in the attached illustration. If the cylinder is released from rest - when the springs are both un-stretched - determine the maximum stretch in each spring.
a curved rectangular bar has a mean radius of 6 in and cross section width b2.5 in and depth h 1.5 in. 1. determine the
Determine the molecular weight of a poly(ethylene-propylene) with a degree of polymerization of 25,000 given that 20% of the mers (by number) are ethylene and 80% are propylenel.
a spherical interplanetary probe of 0.5-m diameter contains electronics that dissipate 150 w. if the probe surface
Two equal masses are connected on either side of a pulley. One of the masses rests on an inclined plane with angle of inclination of b. The other one hangs in mid air.
0.2 m3 of saturated liquid r-134a in a piston cylinder is heated at a constant pressure of 800kpa to 50 dcg c. what is
water is flowing through a large circular conduit with a velocity profile given by the equation v91-r216 ft per second.
a car moves along a straight line starting from rest with an acceleration of 5 fts2 for 6 seconds then brakes with a
an air compressor takes air from outdoors at 28deg c and 101.2kpa and compresses it to 790kpa and 50 deg c. the air
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