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26 Nov 2019

For a class project, Kevin wanted to do a wavesdemonstrationusing the slick-slinky he just bought. Theslick-slinky isdifferent from any slinky he had ever seen. Half ofits coils arethick and the other half are thin. The manufacturerclaims that themass of the thick portion is four times the mass ofthe thinportion. Kevin made some tests and took notes.Unfortunately, hedid not organize his notes and he now has no clueon whatexperiment each of the notes describes. He needs your help.In thefirst experiment, Kevin held the end with the thick coils andhiswife held the side with thin coils, a distance L = 17.0 m away.Kevin started atransverse pulse with an amplitude of A = 19.0 cm byjerking theslinky to the right. Kevin, with your help, hadconcluded that thepulse moves at v1 = 2.0 m/s at his endof the slinky(thick one) and at v2 = 4.0 m/s at hiswife's end of theslinky (thin one). In the second experiment,Kevin’s wife(still holding the side with the thinner coils) startedatransverse pulse with the same amplitude "A" by jerking her endofthe slinky to the right. What is in m/s the speed of the pulsethatgot transmitted into the thick coil section of the slinky?

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