(a(i))[1]
State the physical phenomenon shown in Fig. 3.2.
(a(ii))[1]
At the point of maximum vibration amplitude, state the values of the amplitude and the frequency.
(b(i))[3]
Assume that the oscillations of the $150\,\text{g}$ metal cube are simple harmonic. Use your answers in (a)(ii) to find the maximum acceleration of the metal cube.
(b(ii))[2]
Determine the greatest resultant force acting on the cube.
(c)[2]
Very light feathers are fixed to the top surface of the cube so that they project beyond its vertical sides. The investigation is repeated. On Fig. 3.2, draw a line to show the new variation of vibration amplitude with frequency for frequencies between $2\,\text{Hz}$ and $10\,\text{Hz}$.