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What is the change in velocity in the ab...

What is the change in velocity in the above question?

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The correct Answer is:
`10.13`
Work efficiency coefficient (cofficient of performance)
`beta = (Q_(2))/(Q_(1)-Q_(2)) = (800 xx 10^(3))/((879-800)xx10^(3)) = 10.13`
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RESONANCE ENGLISH-KTG & THERMODYNAMICS-SECTION
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