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The fracture strength of glass may be increased by etching away a thin surface layer. It is believed that the etching may alter the surface crack geometry (i.e. reduce crack length and increase tip radius). Calculate the ratio of the etched and original crack tip radii if the fracture strength is increased by a factor of 3 when 46.0% of the crack length is removed.
in a household air condition system r-134a is condensed steadily in an adiabatic closed heat exchanger by air. air
the roller-coaster track shown is contained in a vertical plane. the portion of track between a and b is straight and
a particle moves along the curve yx2 - 4m with a constant speed of 5 ms. determine the point on the curve where the
consider a steam turbine in which the steam enters at 23.26 mpa and 808 k with a flow rate of 17.78 kgs. the steam
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
A 12 kN force is exerted on a rocker arm. The moment of inertia (I) of the crosssection with respect to the neutral-axis is 43.3x10-9 m4.
a cylindrical stone mix concrete beam of diameter d 0.45 initially at ti 20c is exposed to hot gases at tinfinity
The lamp has a mass of 15 kg and is supported by a pole AO and cables AB and AC. If the force in the pole acts along its axis, determine the forces in AO, AB, and AC for equilibrium.
suppose we wish to test the hypotheses ho u15 h1 u does not 15 where we know that sigma2 9.0. if the true mean is
an insulated rigid container is separated into two parts using a partition that is free to move and the partition
consider nitrogen gas contained in a piston-cylinder device. the cylinder diameter is 150 mm. at the initial state the
a long solenoid has a diameter of 12.0 cm. when a current i exists in its windings a uniform magnetic field b 27.0 mt
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