(a)[2]
$21\%$ of the sphere’s volume lies below the water surface. Calculate the density of the sphere from this information.
(b(i))[3]
The sphere is held so that its whole volume is beneath the water surface, and then released. Calculate the sphere’s initial acceleration.
(b(ii))[3]
The sphere moves upwards with acceleration but is still completely below the water surface. State and explain what happens to the sphere’s acceleration as its velocity starts to increase.
(ii)[3]
As its velocity starts to rise, the sphere still accelerates upwards but remains entirely beneath the water surface. State and explain what happens to its acceleration.