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thermodynamics
3. Series 9. Year - 4. refrigerator
A refrigerator stands in a thermally insulated room, plugged in and switched on. After one hour of work we turn it off and let the room temperature stabilize. Find the differ-ence of this temperature from the original temperature.
2. Series 9. Year - E. afternoon tea
Establish the resistance of electric spiral boiler
Hint: Warm up water and measure the evolution of its temperature in time.