Is there any increase in the water level?

Planting tress increases the ground water level.

Water flows into a conical vessel at the rate of 5 cubic cm per second. If the semivertical angle of the vessel is 30^@ , then the rate of increase of water level when the water level in the vessel is 6 cm is

"In a resonance column experiment, when the length of the air column is increased by changing the water level sound heard becomes louder." Why?

A vessel in the shape of a cuboid contains some water.If three indentical spheres are immersed in the water,the level of water is increased by 2cm. If the area of the base of the cuboid is 160cm^(2) and its height 12cm, determine the radius of any of the spheres.

A vessel in the shape of a cuboid contains some water. If three indentical spheres are immersed in the water, the level of water is increased by 2cm. If the area of the base of the cuboid is 160 c m^2 and its height 12cm, determine the radius of any of the spheres.

A cylindrical bucket with base radius 15 cm is filled with water up to a height of 20 cm. A heavy iron spherical ball of radius 9 cm is dropped into the bucket to submerge completely in the water. Find the increase in the level of water.