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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.

2. Series 9. Year - P. wind in mines

Great Russian scientist M.V. Lomonosov in his work „On the Free Movement of Air in Mines“ discovered the causes of the permanent streams of air in mines of type shown on pic. 4. Determine their direction on condition the air temperature in the mine is constant during the year and the same in all points of the mine.

1. Series 9. Year - 4. gas pressure

A gas of temperature $t$ is placed in a vessel with walls the temperature of which is $t_{c}$. In what case is the gas pressure on the walls higher: when we warm the walls above or when we cool them bellow the gas temperature?

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