DP Physics (first assessment 2025)

Question 20N.1A.SL.TZ0.13

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.13
Level	SL	Paper	1A	Time zone	TZ0
Command term		Question number	13	Adapted from	N/A

13.

[Maximum mark: 1]

20N.1A.SL.TZ0.13

A bicycle of mass $M$ comes to rest from speed $v$ using the back brake. The brake has a specific heat capacity of $c$ and a mass $m$ . Half of the kinetic energy is absorbed by the brake.

What is the change in temperature of the brake?

A. $\frac{M v^{2}}{4 m c}$

B. $\frac{M v^{2}}{2 m c}$

C. $\frac{m v^{2}}{4 M c}$

D. $\frac{m v^{2}}{2 M c}$

[1]

Markscheme

Syllabus sections

B. The particulate nature of matter » B.1 Thermal energy transfers

A. Space, time and motion » A.3 Work, energy and power

Question 20N.1A.SL.TZ0.13

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