(a)[3]
Calculate the volume of the trough.
(b(i))[2]
Show that the volume of water is $19800\text{ cm}^3$.
(b(ii))[1]
Calculate the percentage of the trough that contains water.
(c)[4]
Calculate the time taken to empty the trough. Give your answer in hours and minutes.
(d)[3]
Calculate the value of $r$.
(e)[2]
Calculate the combined mass of the cylinder and the water. Give your answer in kilograms.