Consider a perfectly insulated cup (no heat can leak in or out of the cup) containing...

 

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Consider a perfectly insulated cup (no heat can leak in or out of the cup) containing a mixture of 50 grams of ice and 50 grams of water at 0° C. A small coffee cup heater inside the cup allows heat to be transferred to the ice and water mixture. Heat is transferred at a steady rate and the mixture is stirred con- tinuously so that the temperature is always uniform throughout the mixture. For each question, choose the shape of the temperature-time graph that best cor- responds to the temperature of the mixture during the time interval described. There is still some ice at the end of the time interval, but it has not yet melted completely. Notice that the origin of the graphs does not necessarily represent 0° C. 1. To 2. To 3. To 4. To 5. Tor t 6. None of these 7. Tot 8. To Tot 9. Consider a perfectly insulated cup (no heat can leak in or out of the cup) containing a mixture of 50 grams of ice and 50 grams of water at 0° C. A small coffee cup heater inside the cup allows heat to be transferred to the ice and water mixture. Heat is transferred at a steady rate and the mixture is stirred con- tinuously so that the temperature is always uniform throughout the mixture. For each question, choose the shape of the temperature-time graph that best cor- responds to the temperature of the mixture during the time interval described. There is still some ice at the end of the time interval, but it has not yet melted completely. Notice that the origin of the graphs does not necessarily represent 0° C. 1. To 2. To 3. To 4. To 5. Tor t 6. None of these 7. Tot 8. To Tot 9.