Use the first law of thermodynamics to answer the following.

The same gas is heated as before with $250 kJ$ of energy. This time the gas is allowed to expand so that it does $200 kJ$ of work on its surroundings. Calculate the change in the internal energy of the gas.

Important Questions on Thermal Physics

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 19 - Thermal Physics>Questions>Q 4

When you blow up a balloon, the expanding balloon pushes aside the atmosphere. How much work is done against the atmosphere in blowing up a balloon from a very small volume to a volume of

2

litres

(0.002 m^{3})

? (Atmospheric pressure

= 1.0 \times 10^{5} N m^{- 2} .

)

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 19 - Thermal Physics>Questions>Q 5

Convert each of the following temperatures from the Celsius scale to the thermodynamic scale:

0 ° C, 20 ° C, 120 ° C, 500 ° C, - 23 ° C, - 200 ° C .

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 19 - Thermal Physics>Questions>Q 5

Convert each of the following temperatures from the thermodynamic scale to the Celsius scale:

0 K, 20 K, 100 K, 300 K, 373 K, 500 K .

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 19 - Thermal Physics>Questions>Q 6

The electrical resistance of a pure copper wire is mostly due to the vibrations of the copper atoms. Table 19.1 shows how the resistance of a length of copper wire is found to change as it is heated. Copy the table and add a column showing the temperatures in $K$ . Draw a graph to show these data. (Start the temperature scale of your graph at $0 K .$ ) Explain why you might expect the resistance of copper to be zero at this temperature.

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