FRQ — Gravitation

Long answer·Hard exam skill (4/5)·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

Take Earth's radius as

6400\text{ km}

and surface gravity as

9.8\text{ m s}^{-2}

. Compare

g

at a mine depth of

1600\text{ km}

with

g

at an altitude of

1600\text{ km}

Total: 3 marks

(a) Find $g$ at the mine depth. (1 mark)

(b) Find $g$ at the altitude. (1 mark)

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

Something wrong with this item?