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A carnot's engine working between an unk...

A carnot's engine working between an unknown temperature and ice point gives an efficiency of 50%. What is the unknown temperature ?

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`Q _(1) -Q _(2) // Q _(1) = T _(1) - T _(2) //T_(1) . 100 //Q_(1) = 373 - 273 // 273 , Q_(1) = 373 J //s`
`Q _(2) = Q _(1) - 100 = 373 - 100 = 273 J//s.` Mass of ice melting in one minute `= Q _(2) t//L = 0.0496 kg`
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