DP Physics (first assessment 2025)

Question EXE.2.HL.TZ0.10

Date	Example questions Example questions	Marks available	[Maximum mark: 7]	Reference code	EXE.2.HL.TZ0.10
Level	HL	Paper	2	Time zone	TZ0
Command term	Calculate, Determine	Question number	10	Adapted from	N/A

10.

[Maximum mark: 7]

EXE.2.HL.TZ0.10

The graph shows the variation in torque with time applied to a rotating flywheel.

(a)

Calculate the angular impulse applied to the flywheel.

[2]

Markscheme

Attempt to find area of triangle ✓

$\frac{1}{2} \times 8.0 \times 180 = 720$ «kg m² s⁻¹» ✓

(b)

The angular speed of the flywheel increased by 280 rad s⁻¹ during the application of the angular impulse.

Determine the moment of inertia of the flywheel.

[2]

Markscheme

Use of $Δ L = Δ (I ω)$ ✓

2.6 kg m² ✓

(c)

The flywheel was rotating at 150 rev per minute before the application of the angular impulse. Determine the change in angular rotational energy of the flywheel during the application of the flywheel.

[3]

Markscheme

Correct conversions to a consistent set of $ω$ units ✓

$\frac{1}{2} \times L \times (ω_{f}^{2} - ω_{i}^{2})$ or correct substitution seen ✓

113 kJ ✓

Syllabus sections

A. Space, time and motion

A. Space, time and motion » A.4 Rigid body mechanics

Question EXE.2.HL.TZ0.10

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