Question 49 of 126
10 kg of ice at is added to 100 kg of water to lower its temperature from 25 . Consider no heat exchange to surroundings. The decrement to the temperature of water is .
(specific heat of ice , specific heat of water , latent heat of fusion of ice )
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Answer: (D) 10
Heat available from water cooling 25°C to 0°C: J.
Heat to warm ice from -10°C to 0°C: J.
Heat to melt ice at 0°C: J.
Total needed: J.
Since available heat exceeds required heat, all ice melts. Remaining heat: J
warms 110 kg water: °C.
Final temperature: 15°C.
Decrement in water temperature: °C.
Heat to warm ice from -10°C to 0°C: J.
Heat to melt ice at 0°C: J.
Total needed: J.
Since available heat exceeds required heat, all ice melts. Remaining heat: J
warms 110 kg water: °C.
Final temperature: 15°C.
Decrement in water temperature: °C.