Atrain is moving toward the station at a speed of 25 m/s. its horn emits a sound of frequency 600 hz. (a) calculate the frequency detected by a person standing still at the station. (use 345 m/s for the speed of sound.) (b) as the train moves away, still blowing its horn at the same frequency as before, the observer hears a frequency of 567 hz. calculate the new speed of the train.
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Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?
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Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley
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The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm
Answers: 3
Atrain is moving toward the station at a speed of 25 m/s. its horn emits a sound of frequency 600 hz...
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