Question

12. Metallic discs of radius 0.75 cm and thickness 0.2 cm are melted to obtain 508.68 cm of metal. Find the
number of discs melted. (Use = 3.14)
INCERT Exemplar]
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Answer 1

Step-by-step explanation:

radius of metalic disk= 0.75cm

thickness t=0.2

let n disk should be melted

so volume of n disk=n*π*r^2*t

let l=508.68cm

volume of metal=l^3

mass =volume * density

d* l^3= n*π*r^2*t*d

l^3=n*πr^2*t

n=l^3/(πr^2*t)

hope it will help you.