Two simple pendulums, P and Q, have lengths L1=50cm and L2=120cm respectively. Each is set oscillating with the same small angular amplitude of 4.0∘.
a. (a) Show that the ratio of their maximum linear displacements is equal to the ratio of their lengths.
b. (b) Hence calculate the difference between the linear amplitudes of P and Q, expressing your answer in centimetres to two significant figures.