Plastic drum of cylindrical shape is made by melting spherical solid plastic balls of radius 1 cm . find the number of balls required to make a drum of thickness 2 cm , height 90cm and outer radius 30 cm.
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volume of cylinder=volume of spherical balls ×No of balls
πr²h=4÷3πr³×no of balls
πr²h÷3πr³=no of balls
r²h×1÷3×r³=no of balls
900×30×=no of balls
27000=no of balls
πr²h=4÷3πr³×no of balls
πr²h÷3πr³=no of balls
r²h×1÷3×r³=no of balls
900×30×=no of balls
27000=no of balls
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