Energy transfers

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Question 33

A student investigates how the thickness of insulation around a chilled metal cylinder affects how quickly it warms up when placed in a warm room.

She wraps four identical aluminum cylinders in different numbers of layers of silicone wrap.

This is the student's plan:

I will wrap four identical cylinders with 2 layers, 4 layers, 6 layers, and 8 layers of silicone wrap.
I will place the cylinders in a freezer until they are cold.
I will move them to a warm room, insert a digital temperature probe into each cylinder, and measure their initial temperatures.
After 15 minutes, I will measure the temperatures again.

State the independent variable in this investigation.

[1]

State one variable (other than the material or mass of the cylinder) that the student plans to control.

[1]

Explain why it is important to control this variable.

[2]

Suggest a safety precaution for this investigation.

[1]

Complete the table by calculating each missing temperature difference:

Number of layers of silicone wrap	Starting temperature in $∘C^{\circ}\text{C}$	Temperature after 15 minutes in $∘C^{\circ}\text{C}$
2	3.2	17.5
4	1.9	12.1
6	2.7	9.8
8	3.5	8.6

[2]

The student wants to display the data on a graph. Give suitable labels for the axes of her graph.

[3]

The student realizes that it was a mistake to have different starting temperatures. Suggest how she could modify her method to correct this mistake.

[2]

Energy transfers

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Question 33

A student investigates how the thickness of insulation around a chilled metal cylinder affects how quickly it warms up when placed in a warm room.

She wraps four identical aluminum cylinders in different numbers of layers of silicone wrap.

This is the student's plan:

I will wrap four identical cylinders with 2 layers, 4 layers, 6 layers, and 8 layers of silicone wrap.
I will place the cylinders in a freezer until they are cold.
I will move them to a warm room, insert a digital temperature probe into each cylinder, and measure their initial temperatures.
After 15 minutes, I will measure the temperatures again.

State the independent variable in this investigation.

[1]

State one variable (other than the material or mass of the cylinder) that the student plans to control.

[1]

Explain why it is important to control this variable.

[2]

Suggest a safety precaution for this investigation.

[1]

Complete the table by calculating each missing temperature difference:

Number of layers of silicone wrap	Starting temperature in $∘C^{\circ}\text{C}$	Temperature after 15 minutes in $∘C^{\circ}\text{C}$
2	3.2	17.5
4	1.9	12.1
6	2.7	9.8
8	3.5	8.6

[2]

The student wants to display the data on a graph. Give suitable labels for the axes of her graph.

[3]

The student realizes that it was a mistake to have different starting temperatures. Suggest how she could modify her method to correct this mistake.

[2]

Energy transfers

Question 33

Energy transfers Questions

Energy transfers

Question 33

Energy transfers Questions