Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 5

A student determines the density ρ of steel by taking measurements from a steel wire. mass m = 6.2 ± 0.1 g length l = 25.0 ± 0.1 cm diameter d = 2.00 ± 0.01 mm He uses the equation ρ = 4m / (π d² l). What is the percentage uncertainty in his calculated value of density?

1. A1.1%
2. B1.8%
3. C2.5%
4. D3.0%

As printed in the paper