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Find the number of coins of 1.5 cm diameter and 0.2 cm thickness to be melted to form a right circular cylinder of height 10 cm and diameter 4.5 cm. |
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Answer» radius of COIN = 1.5/2 cm radius of right cylinder = 4.5/2 cm height of coin = 0.2 cm height of cylinder = 10 cm ...no of COINS required = vol of right cylinder/vol of each coin = PI*R*r*H/pi*r*r*hpi gets cancelled=r*r*h/r*r*h=(4.5/2)2* 10/ (1.5/2)2* 0.2= 20.25/4* 10/ 2.25/ 4* 0.24 gets cancelled=20.25*10/2.25*02 = 202.5/0.45 = 450 so, 450 coins are required |
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