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6b_ec8 - Physics 63 Discussion Section Problem Week 7...

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Unformatted text preview: Physics 63 Discussion Section Problem: Week 7 . Potentially usefLIi equations: . ‘ + Van 5 /\F F : 1C _ ‘f v...“ V“ _ G l j: \‘fgouvfll _ vat Two ducks, conveniently named A and B, are floating on the surface of the pond. Duck A begins kicking his feet three times per second, producing a series of rippleswith wavelength A: 2 meters which travel across the pond toward duck B. Neither duck is moving at the moment. ' —0 ' - V‘ .9 R 7 , W?0 I 'rcm—t—l 7' “it: ripples Owt (actuate. “db? cinch— é? (flimwfilnu‘l' flwvolaiem) a) What is the speed of the waves? Now duck A begins swimming to the right at speed v, = 2 m/s. He is still kicking his feet at the same frequency f = 2 times per second, and is still generating a wavefront with. each kick. Duck B remains stationary as she observes the ripples passing by her location. & _ WM VA" 3, vs??? 3 ‘ Wv-o b) As measured by duck B, what is now the speed of the waves? c) As measured by duck B, what is the frequency of the waves? Duck A continues to move at constant speed. Now duck B also begins swimming. Once more she measures the frequency of the waves produced by , duck A, gaging an answer of six cycles per second. 5? 7 \fwove:7 ' i d) Is duck gmoving to the left or to the right? Briefly say ho% youknow. - e)- Calculate her speed W» Va . ' ...
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