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

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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
d.
[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=2.922×2π×30= OR -0.022 «rads-2» ✓

t «=ωf-ωiα=-2.9-0.0220»=130«s»

 

Other methods are possible.

Allow 131s if 2.88 used

Allow 126s if 3 used

Award [2] marks for a bald correct answer