DP Physics (last assessment 2024)

Question 20N.2.SL.TZ0.a(ii)

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.SL.TZ0.a(ii)
Level	SL	Paper	2	Time zone	TZ0
Command term	Estimate	Question number	a(ii)	Adapted from	N/A

a(ii).

[Maximum mark: 2]

20N.2.SL.TZ0.a(ii)

A sample of vegetable oil, initially in the liquid state, is placed in a freezer that transfers thermal energy from the sample at a constant rate. The graph shows how temperature $T$ of the sample varies with time $t$ .

The following data are available.

Mass of the sample $= 0.32 kg$
Specific latent heat of fusion of the oil $= 130 kJ {kg}^{- 1}$
Rate of thermal energy transfer $= 15 W$

Estimate the specific heat capacity of the oil in its liquid phase. State an appropriate unit for your answer.

[2]

Markscheme

$27 \times 10^{3} = 0.32 \times c \times (290 - 250)$ OR $2100$ ✓

$J {kg}^{- 1} K^{- 1}$ OR $J {kg}^{- 1}^{0} C^{- 1}$ ✓

Allow any appropriate unit that is $\frac{e n e r g y}{m a s s \times t e r m p e r a t u r e}$

Syllabus sections

Core

Core » Topic 3: Thermal physics » 3.1 – Thermal concepts

Core » Topic 1: Measurements and uncertainties » 1.1 – Measurements in physics

Core » Topic 1: Measurements and uncertainties

Core » Topic 3: Thermal physics

Question 20N.2.SL.TZ0.a(ii)

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Syllabus sections

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