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Find the tension in the string and the e...

Find the tension in the string and the extension in the spring at equilibrium . Where pulley, strings and springs are ideal.

Text Solution

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The correct Answer is:
A, B, C

`(kx)/(2)=mg,x=(2mg)?(k),T=mg`

`x=(mg)/(k), T=kx :. T=mg`


`x=(mg)/(k),T=mg`
`F.B.C.` Block `A`
`kx=mg+T ...............(1)`
`F.B.C.` Block `B`
`T=mg .......(2)`
`:. kx=2mgx=(2mg)/(k)`

`F.B.D.` of Upper Block `A`

`F.B.D.` of Lower Block `(B)`

`kx=mg ..............(2) :. x=(mg)/(k)`
By `(1) & (2) T =2mg`
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