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Texas cotton farmers suffer from hail storms. The federal government provides hail insurance. An entrepreneur has discovered a way to seed thunderclouds so as to prevent them from producing hail. The entrepreneur wishes to sell its invention to the government or to a cotton-farmers organization. Both argue that because farmers can buy insurance against hail damage, there is no need to spend money to prevent hail storms. Is this argument correct? Make a case for your answer.
a liquid spray nozzle is designed to produce a specific size droplet with diameter d. the droplet sized depends on the
a 1200 lb wrecking ball with a velocity of 4 fts at the bottom of its arc strikes a wall and comes to rest in a
compare air and helium as cooling media for electronic devices. both fluids must exit through an area of 0.025 m2. the
crosslinked copolymers consisting of 60 wt ethylene and 40wt propylene may have elastic properties similar to those
air expands in a piston-cylinder device with a polytropic exponent of 1.3. the initial pressure and temperature were
1 a presser relief valve has a pressure setting of 1500 psi. compute the horsepower loss across the valve if it returns
One side of a mercury manometer is connected to the top of frictionless piston-cylinder storage tank containing 1500 liters of oil, the other side is open to the atmosphere. The difference in the height of the column of mercury in the manometer is 90..
What is the maximum carbon content possible for a plain carbon steel that must have an impact energy of at least 200 J at -50°C?
If the standard material is aluminum, with kA = 200 W/m · K, and measurements reveal values of TA = 75°C and TB = 60°C at Xl for Tb = 100°C and Too = 25°C, what is the thermal conductivity kB of the test material?
Consider a supersonic wind tunnel with test section Mach number of 2 and fixed geometry diffuser designed to operate with minimum stagnation pressure losses (smallest diffuser area).
for a piece of material the steady-state flow across its thickness is 0.297 10-3 kgm2 h. if the concentration on the
Water fills a 0.5 m 3 piston-cylinder device at a pressure of 200 kPa and a quality of 40%. The container is now heated until the temperature reaches 500°C. Determine the final volume. Sketch on a P-v diagram relative to the saturation lines
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