In an isothermal process, 0.1 cubic feet of standard air per minute (SCFM) is pumped into a balloon. Tension in the rubber skin of the balloon is given by  = kA, where k = 200 lbf/ft3, and A is the surface area of the balloon in ft2. Compute the time required to increase the balloon radius from 5 to 7 inches. (Ans. t = 828 sec.)

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Given Pressure P 1 atm Temperature T 25 C Tension o KA where K 10 KNm Let radius of ball... View the full answer