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CBSE Class 11-science Answered

1.if Radius of a sphere is doubled, volume is increased by _____ Answer is 2 times. but i dont know how to work out 2. if radius of sphere is tribled, voulume increased by_________ Answer is 27 times . but i dont know how to work out
Asked by chaitra k k | 29 Nov, 2013, 04:55: PM
answered-by-expert Expert Answer
Let r be the radius of the sphere. Thus, the volume of the sphere is
Suppose the radius is doubled. Let R be the radius of the bigger sphere.
 
Then the volume of the bigger sphere is
It is given that,
2.
Similarly, if radius of the sphere is tribled, we have
 
R = 3r
Answered by Vimala Ramamurthy | 30 Nov, 2013, 07:17: AM

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