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Question 19M.2.SL.TZ2.14b

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ2.14b
Level SL Paper 2 Time zone TZ2
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
19M.2.SL.TZ2.14b
(b)

Outline, with reference to the curve, why it is unsafe to drive a train across the bridge at 30 m s-1 for this amount of damping.

[2]

Markscheme

30 m s–1 corresponds to f = 1.2 Hz ✔

the amplitude of vibration is a maximum for this speed

OR

corresponds to the resonant frequency ✔

Examiners report

The answers to this question were generally well presented and a correct argument was presented by almost all candidates. Resonance was often correctly referred to.

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