DP Physics (last assessment 2024)

Question 18N.3.SL.TZ0.6b.i

Date	November 2018	Marks available	[Maximum mark: 2]	Reference code	18N.3.SL.TZ0.6b.i
Level	SL	Paper	3	Time zone	TZ0
Command term	Calculate	Question number	b.i	Adapted from	N/A

b.i.

[Maximum mark: 2]

18N.3.SL.TZ0.6b.i

A uniform rod of weight 36.0 N and length 5.00 m rests horizontally. The rod is pivoted at its left-hand end and is supported at a distance of 4.00 m from the frictionless pivot.

The support is suddenly removed and the rod begins to rotate clockwise about the pivot point. The moment of inertia of the rod about the pivot point is 30.6 kg m².

(b.i)

Calculate, in rad s^–2, the initial angular acceleration $\alpha$ of the rod.

[2]

Markscheme

36.0 × 2.50 = 30.6 × $\alpha$ ✔

$\alpha$ = 2.94 «rad s^–2» ✔

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 18N.3.SL.TZ0.6b.i

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