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A light inextensible string that gas ove...

A light inextensible string that gas over a smooth fixed pulley as shown in the figure connect two blocks of masses it `0.36` kg and `0.72` kg Taking `g = 10 ms^(-2)` , find the work done(in joules) by the string on the block of mass ` 0.36` kg during the first second after the system is reposed from rest ,

Text Solution

Verified by Experts

The correct Answer is:
8
`2mg-T=2ma`

`T-mg=ma`
`a=g/3`
`T=(4mg)/(3)`
`W=Txxs=Txx1/2 at^2=8J`
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Knowledge Check

  • A light in extensible string that goes over a smooth fixed pulley as shown in the figure connect two blocks of masses 0.36kg and 0.72kg . Taking g = 10 m//s^(2) . Find the work done by string on the block of mass 0.36 kg during the first second after the system is released from rest.

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    4J
    B
    2J
    C
    8J
    D
    10J

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    A
    `4m//s^(2)`
    B
    `2m//s^(2)`
    C
    zero
    D
    `6m//s^(2)`

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    A
    `(12)/(5)`
    B
    `(11)/(5)`
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