DP Physics (first assessment 2025)

Question 20N.2.HL.TZ0.6d

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.HL.TZ0.6d
Level	HL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	d	Adapted from	N/A

[Maximum mark: 2]

20N.2.HL.TZ0.6d

(d)

The torque is removed. The bar comes to rest in $30$ complete rotations with constant angular deceleration. Determine the time taken for the bar to come to rest.

[2]

Markscheme

$α = \frac{2 . 9^{2}}{2 \times 2 π \times 30} =$ OR $- 0.022 « rad s^{- 2} »$ ✓

$t « = \frac{ω_{f} - ω_{i}}{α} = \frac{- 2.9}{- 0.0220} » = 130 « s »$ ✓

Other methods are possible.

Allow $131 s$ if $2.88$ used

Allow $126 s$ if $3$ used

Award [2] marks for a bald correct answer

Syllabus sections

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

Question 20N.2.HL.TZ0.6d

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