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Tracking Energy When a Model Gas Expands 4 questions
Tracking Energy When a Model Gas Expands
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A class compares two models that start with the same amount of the same gas at the same temperature. Each gas receives 25 J from a heater. In P the gas is held in a rigid box. In Q the gas expands and pushes a movable platform. Neither loses heat to the room. In this model, the net energy left in the gas increases its thermal energy and determines its temperature rise.
| Model | Energy transferred from heater to gas (J) | Energy transferred from gas by pushing platform (J) |
|---|---|---|
| P | 25 | 0 |
| Q | 25 | 15 |
Question 1
Which model gains more thermal energy under the stated conditions?
- P only
- Q only
- Both gain the same thermal energy.
- Neither gains thermal energy.
Question 2
Calculate the thermal-energy increase of Q. Include both transfers in your calculation.
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Question 3
A student predicts equal final temperatures because the heaters transfer equal energy. Evaluate the claim using the model records.
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A repeat of Q still transfers 15 J by moving the platform. A new heater supplies enough energy for the gas to gain the same thermal energy as P.
Question 4
Calculate the energy supplied by the new heater.
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