Longest wavelengths for standing sound waves
What are the three longest wavelengths for standing sound waves in a 121-cm-long tube that is (a) open at both ends and (b) open at one end, closed at the other?
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A high school project involves building a model ultralight airplane. Some of the stu- dents propose making an airfoil from a sheet of plastic 1.5 m long by 2 m wide at an angle of attack of 12o.
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Determine the minuimum coeffeicent of static friction between A and B required for A not to slide with respect to B if θ = 23. Friction between the sled and the incline is negligible.
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A 3-phase 25 kVA, 208 V, 60 Hz, alternator (generator) is operating under balanced conditions and supplies a current of 20 A per phase at 0.8 lagging power factor to a load at rated voltage.
One prominent physician claims that 70% of those with lung cancer are chain smokers. If his assertion is correct, the probability that 3 out 5 of such patients are chain smokers is?
A water faucet is to be added by running a line from a water main at 300 kPa. The diameter (cm) of the cast iron pipe is to be determined. A gate valve is placed near the attachment to the water main, and the faucet includes an angle valve.
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