A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2016 · Q61 Mark
An experiment to determine atmospheric pressure P uses the equation P = ρgh where ρ = (13600 ± 100) kg m⁻³, g = (9.81 ± 0.02) m s⁻², h = (0.762 ± 0.005) m. What is the value of P, with its uncertainty, when stated to an appropriate number of significant figures?
A(1.0166 ± 0.0162) × 10⁵ Pa
B(1.017 ± 0.016) × 10⁵ Pa
C(1.017 ± 1.6%) × 10⁵ Pa
D(1.02 ± 0.02) × 10⁵ Pa
✓ Correct answer
D: (1.02 ± 0.02) × 10⁵ Pa
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