diameter of a sphere is 42 cm. it is melted and is drawn into cylindrical wire of 28 cm diameter. find the length of wire.
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Answer:
Given
diameterofasphere=42cm
radius= 42/2 =21cm
Now,
Volumeofsphere= 3/4 πr 3= 3/4 *7/ 22 ×21×21×21
=4×22×21×21
=3,8808cm 3
Volumeofsphere=volumeofcylinder
38,808=πr 2 h
⇒38808= 7/22 ×14×14×h= 11696
h=63
Hence,lengthofwireis63cm.
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