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    Physics
    Fluid-Mechanics
    Easy

    Question

    straight A space metal space bar space of space length space straight L space and space area space of space cross minus section space straight A space is space clamped space between space two space rigid space supports. space For space the space material space of space the space rod comma space its space Young ’ straight s space modulus space is space straight Y space and space coefficient space of space linear space expansion space is space space alpha italic space. space If space the space temperature space of space the space rod space is space increased space by space straight capital delta t to the power of ring operator C space space the space force space exerted space by space the space rod space on space the space supports space is

    1. Y A L straight capital delta t
    2. Y A alpha straight capital delta t
    3. fraction numerator Y L alpha straight capital delta t over denominator A end fraction
    4. Y alpha A L straight capital delta t

    The correct answer is: Y A alpha straight capital delta t

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