Mathematics
A hollow cylinder has solid hemisphere inward at one end and on the other end it is closed with a flat circular plate. The height of water is 10 cm when flat circular surface is downward. Find the level of water, when it is inverted upside down, common diameter is 7 cm and height of cylinder is 20 cm.
Mensuration
ICSE
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Answer
Given,
For Cylinder :
Height (H) = 20 cm, Radius (R) = 3.5 cm
For Hemisphere :
Radius (r) = Radius of cylinder (R) = 3.5 cm
![A hollow cylinder has solid hemisphere inward at one end and on the other end it is closed with a flat circular plate. The height of water is 10 cm when flat circular surface is downward. Find the level of water, when it is inverted upside down, common diameter is 7 cm and height of cylinder is 20 cm. Cylinder, Cone, Sphere, Concise Mathematics Solutions ICSE Class 10.](https://cdn1.knowledgeboat.com/img/cm10/q15-c20-ex-20-f-cylinder-cone-sphere-concise-maths-solutions-icse-class-10-247x282.png)
When flat surface is downward, then height of water (h) = 10 cm.
So, when circular surface part will be downward then,
Let height upto which water fills be h1.
Volume of cylinder (upto height h1) = Volume of cylinder (upto height h) + Volume of hemisphere
Hence, the level of water, when cylinder is inverted upside down = 12.33 cm.
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