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GCSE Mathematics Question Analysis - Mathematics - Volume

GCSE Mathematics Question Analysis

· gcse mathematics,mathematics,volume

GCSE Mathematics Question Analysis Topic: Mathematics - Volume

Exam Question:

150 spherical marbles, each of diameter 1.4 cm, are dropped in a cylindrical vessel of diameter 7 cm containing some water, which are completely immersed in water. Find the rise in the level of water in the vessel.

Answer:

For GCSE Mathematics, you should know:

We are given that a marble's diameter is 1.4 cm, making its radius 0.7 cm.

The volume of each marble can be calculated by 4πr3 = 4/3 x 22/7 x (0.7)3 = 1.44 x 150 = 216 cm3.

Then, let the rise in the water level in the cylindrical vessel be h cm. Also, since the vessel's diameter is 7 cm, its radius is thus 3.5 cm.

We can find the volume of the increased level of water by:
πr2h = 22/7 x 3.52 x h. This also equals to the volume of the 150 marbles that were added i.e., 22/7 x 3.52 x h = 216 cm3.

--> h = 5.6 cm.

Work hard for your GCSE Mathematics examination!

End of analysis. Great!

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