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Wwwwwwvu wyry TVOVIONG,Some plastic balls of radius 1 cm were melted and cast into a tube. The thickness.length and outer radius of the tube were 2 cm, 90 cm and 30 cm respectively.How many balls were melted to make the tube?​

Answer»

Answer:

Answer:

No of balls are 7830.

Step-by-step EXPLANATION:

Given: Radius of plastic ball, r = 1 CM

          Thickness of tube = 2 cm

          Length of Tube, h = 90 cm

          Outer radius of Tube,  = 30 cm

To find: No. of Balls

Volume of a ball = volume of sphere

                           =

                           =

                           =

Inner radius of tube,  = 30 - 2 = 28 cm

Volume of tube = Volume of Outer cylinder - Volume of Inner Cylinder

                         =

                         =

                         =

                         =

                              

                              

                              

Therefore, No of balls are 7830.

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