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    Physics
    Fluid-Mechanics
    Easy

    Question

    Find the force with which the rods act on each other at the higher temperature in terms of the given quantities

    1. F equals fraction numerator A open parentheses L subscript 1 alpha subscript 1 plus L subscript 2 alpha subscript 2 close parentheses T over denominator open square brackets L subscript 1 over Y subscript 1 plus L subscript 2 over Y subscript 2 close square brackets end fraction
    2. F equals A open parentheses Y subscript 1 alpha subscript 1 plus Y subscript 2 alpha subscript 2 close parentheses T
    3. F equals fraction numerator A open parentheses Y subscript 1 alpha subscript 1 plus Y subscript 2 alpha subscript 2 close parentheses T over denominator 2 end fraction
    4. F equals fraction numerator A open parentheses L subscript 1 over Y subscript 1 plus L subscript 2 over Y subscript 2 close parentheses T over denominator L subscript 1 alpha subscript 1 plus L subscript 2 alpha subscript 2 end fraction

    The correct answer is: F equals fraction numerator A open parentheses L subscript 1 alpha subscript 1 plus L subscript 2 alpha subscript 2 close parentheses T over denominator open square brackets L subscript 1 over Y subscript 1 plus L subscript 2 over Y subscript 2 close square brackets end fraction

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