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.
A fair coin is tossed 100 times. What does the Chebyshev inequality tell you about the probability that the number of heads that turn up deviates from the expected number by three or more standard deviations?
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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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