FRQ — Properties of Bulk Matter

Short answer·Standard multi-step (3/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A brass scale is correct at

20^\circ\text{C}

. Its coefficient of linear expansion is

1.8\times10^{-5}\text{ K}^{-1}

. At

70^\circ\text{C}

, it is used to measure a rod and reads

50.00\text{ cm}

Total: 3 marks

(a) Explain whether the true rod length is larger or smaller than $50.00\text{ cm}$ . (1 mark)

(b) Estimate the true length of the rod. (2 marks)

Your response (optional — you can also work on paper)

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