(a)[2]
State two forms of energy into which gravitational potential energy is transferred.
(b(i))[2]
Each turn, the pieces descend an average distance of $1.2\,\text{m}$. The combined mass of the metal pieces is $150\,\text{g}$. Calculate the decrease in the gravitational potential energy of the pieces for one fall. Take the gravitational field strength $g$ to be $10\,\text{N kg}^{-1}$.
(b(ii))[3]
A student rotates the tube more rapidly. Once the small metal pieces have travelled from one end to the other 80 times, their temperature has risen by $7.0\,^\circ\text{C}$. Determine the specific heat capacity of the metal.
(b(iii))[1]
The student repeats the experiment but turns the tube more slowly. Suggest why a different temperature rise is obtained.