A circular disc of diameter 4cm are punched out of a sheet of brass of mass 0.4g/cm^2. What is the mass of 500 such discs
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given: d = 4 cm => r = 2 cm, unit weight = 0.4g/cm²
to find mass of 500 discs
mass of 500 disc = mass of one disc × unit weight
mass of one disc m
=> area of one disc × unit weight
area A of one disc = πr²
=> 22/7 * 2*2 = 88/7 cm²
mass of one disc = 88/7*0.4 = 5 gm
therefore mass of 500 disc = 500×5 = 2500 gm
=> 2.5 kg
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