A student investigated the insulating properties of two different materials - AQA - GCSE Physics - Question 8 - 2022 - Paper 1
Question 8
A student investigated the insulating properties of two different materials.
The same thickness of each material was used.
Figure 9 shows some of the equipment used... show full transcript
Worked Solution & Example Answer:A student investigated the insulating properties of two different materials - AQA - GCSE Physics - Question 8 - 2022 - Paper 1
Step 1
What is the resolution of thermometer B?
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Answer
The resolution of thermometer B is 0.1 °C. This refers to the smallest change in temperature that the thermometer can accurately measure.
Step 2
Complete the sentence.
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Answer
Thermometer A has a bigger chance of being misread than thermometer B. This indicates that Thermometer B provides readings that are more precise and easier to interpret.
Step 3
Determine the total change in thermal energy of the water when Material X was used.
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Answer
To calculate the total change in thermal energy, use the formula:
E=mcheta
Where:
m (mass of water) = 0.12 kg
c (specific heat capacity of water) = 4200 J/kg°C
θ (temperature change) should be derived from Figure 11.
Assuming the temperature change is 12.5 °C, the total change in thermal energy would be:
E=0.12kgimes4200J/kg°Cimes12.5°C=6300J
Step 4
There is an anomalous result on Figure 11.
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The anomalous result is indicated at the point where 'Material X' data shows an unexpected high temperature reading, differing significantly from other readings.
Step 5
Give two conclusions that can be made from Figure 11.
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Answer
Water wrapped in material X cooled more slowly compared to water wrapped in material Y.
Material Y is a better thermal conductor than material X, indicated by the higher final temperature of water wrapped in material Y.
Step 6
How would using thick insulation affect the rate of cooling of hot water compared with using thin insulation?
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The rate of cooling would be lower. Thick insulation minimizes heat loss to the surroundings, which slows down the cooling process.
Step 7
Predict how using thick insulation would affect the temperature of the water after 10 minutes compared with thin insulation.
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The temperature would be higher. Thick insulation keeps the heat contained within the water for a longer period.
