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A thin-walled circular tube and a solid circular bar of the same material, the same cross-sectional area, and the same length are subjected to torsion. What is the ratio of the strain energy U1 in the tube to the strain energy U2 in the solid bar if the maximum shear stresses are the same in both cases?
an alcohol manufacturing facility emits air with 500 ppm ethanol. the air flows out several roof vents at a total flow
a heat pump operates on the ideal vapor compression refrigeration cycle with r-134a as the working fluid between the
consider a cross flow of water saturated water that comes at 20c with a velocity of 5 ms on the surface of a
As fresh poured concrete hardens, the chemical transformation releases energy at a rate of 2 W/kg. Assume the center of a poured layer does not have any heat loss and that it has an average heat capacity of 0.9 kJ/kg K. Find the temperature rise d..
A scissors jack is used to lift a load W. The links of the jack are rigid and the collars can slide freely on the shaft against the springs of stiffnesses k1 and k2 (see Fig. 2.63). Find the natural frequency of vibration of the weight in the vert..
a single stream tube is selected to characterize the air flow past the wing of an aircraft in flight at an altitude of
a 2-kg sphere a is moving toward the right at 4 ms when it strikes the end of a 5 kg slender bar b. the coefficient of
the position vector of a particle moving in the x-y plane at time t3 sec is rt32i-3j m. at time t5 sec its position
Show that this equivalent circuit is the same as that given by (10.3-46).
a fully automated production line in a facility involves metal blocks being placed in a furnace for heat treatment. two
consider a household 120 v two-plug electric outlet protected by a 15 a circuit breaker. a you plug in a hair dryer and
certain microalloyed steels contain small additions of vanadium or niobium that permit the grain size to be reduced to
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