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A balloon is to be used to carry meteorological instruments to an elevation of 18000 feet. The balloon is filled with helium at the ground level temperature and pressure ( 70 degrees Fahrenheit, 1 atm). The balloon material weighs .001 lb per square foot. If the instruments weigh 12 lbs, what should the diameter be of the spherical balloon ? Assume the temperature to drop 10 degrees Fahrenheit for every 4000 feet height.
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Water enters a 2 meter diameter pipe at a temperature of 23 deg C. The water leaves the pipe at a temperature of 97 deg C The laminar flow rate is such that the Reynolds number is 800. What is the mass flow rate?
two cars simultaneosly enter an intersection with 35 degrees between their headings. the car on the left weighs 5000
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a particle which moves in two-dimensional motion has coordinates given in inches by x t2 - 4t 20 and y 3 sin 2t
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