What frequency is heard by an observer who hears the 450-hz
What frequency is heard by an observer who hears the 450-Hz siren on a police car traveling at 35 m/s away from her? Assume that the velocity of sound in air is 345 m/s.
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Find the expected value of X, find the variance of X and what is the conditional distribution of Y given that X=3?
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What frequency is heard by an observer who hears the 450-Hz siren on a police car traveling at 35 m/s away from her
A development is being planned within a 250-acre watershed. The present land use is 120 acres of pasture, with soil type B(CN=61), and the rest soil type D (CN=80). The Tc is 54 min. and the 2-year, 24-hour storm depth is 4 in.
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If the ultimate BOD of the mixed river water is 30mg/L, the rate constant for BOD at 20ºC is 0.6d-1, the reaeration rate constant at 20ºC is 0.8d-1, and the removal of BOD by sedimentation can be neglected
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