A crane is used to lower weights of rectangular blocks into the sea for underwater construction projects. A single rectangular block has dimensions 0.4m × 0.4m × 0.3m and it has a density of 23000kg/m³.
(a) what is the tension in the rope of the crane when the block is suspended in the air?
(b) what is the tension in the rope of the crane when the block is completely immersed in seawater?