Physicshard · Past Paper
What is the percentage change in 'g' if the radius of Earth shrinks by 2% (mass constant)?
AIncreases by 2%
BIncreases by 4%
CDecreases by 2%
DDecreases by 4%
✓ Correct Answer: B — Increases by 4%
Using error approximation: dg/g = -2 * dR/R. So -2 * (-2%) = +4%.
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