DP Physics (last assessment 2024)

Question 20N.3.SL.TZ0.a

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.3.SL.TZ0.a
Level	SL	Paper	3	Time zone	TZ0
Command term	Show that	Question number	a	Adapted from	N/A

[Maximum mark: 2]

20N.3.SL.TZ0.a

A bar rotates horizontally about its centre, reaching a maximum angular velocity in six complete rotations from rest. The bar has a constant angular acceleration of $0.110 rad s^{- 2}$ . The moment of inertia of the bar about the axis of rotation is $0.0216 kg m^{2}$ .

Show that the final angular velocity of the bar is about $3 rad s^{- 1}$ .

[2]

Markscheme

${ω_{f}}^{2} = 0 + 2 \times 0.110 \times 6 \times 2 π$ ✓

$ω_{f} = 2.88 « rad s^{- 1} »$ ✓

Other methods are possible.
Answer 3 given so look for correct working
At least 2 sig figs for MP2.

Syllabus sections

Option B: Engineering physics

Option B: Engineering physics » Option B: Engineering physics (Core topics) » B.1 – Rigid bodies and rotational dynamics

Option B: Engineering physics » Option B: Engineering physics (Core topics)

Question 20N.3.SL.TZ0.a

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