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Question 19N.2.SL.TZ0.2b(ii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.SL.TZ0.2b(ii)
Level SL Paper 2 Time zone TZ0
Command term Show that Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
19N.2.SL.TZ0.2b(ii)

The air in a kitchen has pressure 1.0 × 105 Pa and temperature 22°C. A refrigerator of internal volume 0.36 m3 is installed in the kitchen.

The refrigerator door is closed. The air in the refrigerator is cooled to 5.0°C and the number of air molecules in the refrigerator stays the same.

(b(ii))

The door of the refrigerator has an area of 0.72 m2. Show that the minimum force needed to open the refrigerator door is about 4 kN.

[2]

Markscheme

F=A×∆p ✔

F=0.72×1.0-0.94×105 OR 4.3 × 103 « N »✔

NOTE: Allow ECF from (b)(i)
Allow ECF from MP1

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