Q. 33.6( 25 Votes )

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Answer :

Volume of 1 plastic ball = VB


Radius of ball, rB = 1 cm




Length of tube, h = 90 cm


Outer radius of tube, rO = 30 cm


Thickness of tube = 2 cm


Inner radius, rI = 30 – 2 = 28 cm


Volume of tube, VT = Volume of Outer cylinder – Volume of inner cylinder



VT = 90π(302 - 282)


VT = 90× 116 × π


Let ‘n’ be the number of balls melted.


VT = n × VB



n = 7830 balls


7830 balls were melted to make the tube.


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