1.

4. Find the number of coins 0.8 cm in radius and0.4 cm thick to be melted to form a right circularcylinder of height 10 cm and 8 cm as radius.(Hint. The shape of coin is cylindrical).​

Answer»

Answer:

Given, RADIUS of cylindrical coin, r = 0.8 m = 80 cm

Height of coin = thickness = 0.4m = 40 cm

Height of CYLINDER h = 10 cm

Radius of the cylinder, r' = 8 cm

A/Q,

No. Of COINS * Volume of 1 coin = Volume of Cylinder

=> N * 22/7 * 80* 80* 40 = 22/7 * 8 *8*10

= > N * 5632/7 = 14080/7

=> N = 14080/5632 = 2.5



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