78. (a) If the destroyer drifts with the current, then it will detect a signal with frequency f0 given by f0 = f µ v v − u 1 ¶ = (1000 Hz)(5470 km / h) 5470 km / h − (75 . 0km / h − 30 . 0km / h) = 1008 . 29 Hz . Thus, ∆ f = f0 − f =8 . 29 Hz . (b) If the destroyer is stationary with respect to the ocean ﬂoor, then it is moving at u 2 =30 . 0km
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.