Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 5

A student measures the length $l$ and the period $T$ of oscillation of a simple pendulum. He then uses the equation shown to calculate the acceleration of free fall $g$. $T = 2\pi\sqrt{\dfrac{l}{g}}$ His measurements are shown. | | | |---|---| | $l$ | $(87.3 \pm 0.2)\,\text{cm}$ | | $T$ | $(1.9 \pm 0.05)\,\text{s}$ | What is the percentage uncertainty in his calculated value of $g$?

1. A2.4%
2. B2.9%
3. C5.5%
4. D7.2%

As printed in the paper