A student is investigating the motion of a small steel ball in cooking oil. A measure of the oil's resistance to the ball's motion is called viscosity. Viscosity has the units pascal second (Pa s).
The student drops a ball into a cylinder of oil as shown in Fig. 2.1. [Figure 2.1]
The velocity of the ball is measured when it becomes constant and then the viscosity of the oil is determined.
The experiment is repeated for different temperatures of oil.
It is suggested that the viscosity η and the Celsius temperature θ are related by the equation
η = ρθ^q
where p and q are constants.

Q: What topic does this question test?

This question tests Temperature in A-Level Physics (syllabus code 9702). It is worth 15 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Feb/Mar 2019 examination, Paper 5 Variant 2 (9702_m19_qp_52.pdf).

Question

A student is investigating the motion of a small steel ball in cooking oil. A measure of the oil's resistance to the ball's motion is called viscosity. Viscosity has the units pascal second (Pa s).
The student drops a ball into a cylinder of oil as shown in Fig. 2.1. [Figure 2.1]
The velocity of the ball is measured when it becomes constant and then the viscosity of the oil is determined.
The experiment is repeated for different temperatures of oil.
It is suggested that the viscosity η and the Celsius temperature θ are related by the equation
η = ρθ^q
where p and q are constants.

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