DP Physics (first assessment 2025)

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Question EXE.2.HL.TZ0.d

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Date Example questions Example questions Marks available [Maximum mark: 3] Reference code EXE.2.HL.TZ0.d
Level HL Paper 2 Time zone TZ0
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d.
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EXE.2.HL.TZ0.d

During a maintenance shutdown of the reactor, the gas supply to the turbine is cut off and the turbine gradually comes to rest. The diagram shows how the angular speed  of the turbine varies with time t.

Show that the rotational kinetic energy of the turbine decreases at a constant rate.

[3]

Markscheme

Rotational KE is proportional to ω2 ✓

Calculation of ω2 for at least four points, e.g. {96.1, 76.7, 57.6, 38.4, 19.3}×103

Shows that the differences in equal time intervals are approximately the same, e.g. {19.4, 19.1, 19.2, 19.1, 19.3}×103 ✓

 

Allow a tolerance of ±1×103 s−2 from the values stated in MP2.

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