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XMUM SFS FIS Physics I FIS2061 2. Suppose you are on a boat at rest in a shallow lake, observing the crests of a passing sinusoidal (a) Approximately how much time elapses between one crest reaching your boat and the wave. You estimate that the crests are 80 m apart and the speed of the wave is 10 ms-1. next? [2 m)

(b) You start the engine and sail directly opposite the motion of the waves at 4.5 m s Now how much time elapses between one crest reaching your boat and the next? [2 m]

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Answer #1

The concept of relative speed ...Solut fon ÷ erests ove 8o m apart ten then tine etarsed - .86 - gsec 下 the direction of motion op wave so nelative distancc is som utelattve speed = 10+5= LS m/sec SO 5.33 Sec 从25

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