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3 Conservation of energy

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Question 59
F

A student compares how quickly hot water cools in two containers, X and Y. The walls of the containers have the same thickness but are made of different materials.

The student pours the same volume of water at 80 ∘C80\ ^{\circ}\text{C}80 ∘C into each container and measures the temperature every 2 minutes.

The Figure shows the results.

Figure

image

a.

Use the graph to find the temperature of the water in container X after 4 minutes.

[1]
b.

Calculate the average decrease in temperature per minute for the water in container Y over the 10 minutes.

[2]
c.

Explain which container has walls with the higher thermal conductivity.

Use information from the graph in your answer.

[2]
d.

Give two variables, other than the ones already given, that the student should keep the same so that the comparison is valid.

[2]
Markscheme

3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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