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A 2 mm diameter, spherical air bubble is suspended in an insulating fluid . with a focused laser, the bubble is heated so that the bubble radius increases by 90% . For spherical bubble the pressure difference between the bubble and surrounding fluid is given by delta P = 2s/r , where s is the interfacial tension and r is the radius of the bubble . assuming the interfacial tension is constant at 0.70 N/m, the initial bubble temperature is 300K, and the surrounding fluid has a pressure of 100 kPa calculate (a) the mass of the bubble , (b) the final temperature of the bubble ,(c) the work done by the gas , and(d) the laser energy required to perform the expansion. Additionally , is this is a realistic scenario?? Why? What assumption are most likely to fail? Note the volume of the bubble is related to the radius by V=(4/3)pr3
water is the working fluid in a vapor power cycle. the pressure and temperature at the turbine inlet are 1600 psia and
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Obtain a new solution, and determine whether any buckling constraints are active. If no buckling constraints are active for L = 10 in., re-run the analysis by increasing L , and estimate the value of L at which at least one buckling constraint b..
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
in a rolling operation material a 8 inches wide and 2 inches thick was reduced to the maximum extent possible in a
Calculate the minimal round-trip time delay for a radio communications link between Los Angeles and the satellite.
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A construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32 ft rooftop. A block and tackle system with 50 lb of effort force is designed to lift the materials.
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