tell me the reason why point of centre of gravity is lowered when glass cylinder is filled half with water?

Answer 1

After you half-fill it with water, there is more mass concentrated towards the bottom of the cylinder. Thus, lower center of mass.

Answer 2

The centre of gravity of an empty glass cylinder will be slightly lower than half the height (because the base is usually thicker and thus heavier than the side walls). When water or any other liquid is filled partially, the mass distribution changes and the bottom becomes heavier. Thus the centre of gravity shifts downwards. When the cylinder is completely filled, the centre of gravity again equals the original position since the liquid below and above the centre of gravity is equal.

Answer 3

When the cylinder is full of water the C. G lies in the center of the cylinder. When you remove half the water, half of the mass in the upper portion of the cylinder is removed.

Since the water column length is decreased to half its original height, the C.G of water column is reduced to its new center. Hence the c.g of the whole system is reduced.

Answer 4

the water weighs down the cylinder, so to make the top weigh the same as the bottom, the centre of gravity goes down.

Answer 5

when a glass cylinder is empty,
centre of mass lies at geometrical centre.

now , when we fill it with water , then the lower half of tube beomes more massive .

hence,
due to more mass on lower half, the centre of mass gets shifted a bit downwards.

Answer 6

The center of mass of a cylinder is at the middle of it because symmetrical shape.If we lower the cylinder its center of mass is lowered.

Answer 7

Because all the weight is nearer the bottom of the glass