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[" 42.Toy cart tied to the end of an uns...

[" 42.Toy cart tied to the end of an unstretched string of "],[" length "a" ,when revolved moves in a horizontal circle of "],[" radius "2a" with a time period "T" .Now the toy cart is "],[" speeded up until it moves in a horizontal circle of "],[" radius "3a" with a period "T" .If Hooke's law "(F=kx)" holds,"],[" then "],[[" (a) "T'=sqrt((3)/(2))T," (b) "T'=((sqrt(3))/(2))T],[" (c) "T'=((3)/(2))T," (d) "T'=T]]

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