4. Find the number of coins 0.8 cm in radius and
0.4 cm thick to be melted to form a right circular
cylinder of height 10 cm and 8 cm as radius.
(Hint. The shape of coin is cylindrical).
Answers
Answered by
2
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
Answered by
2
Answer:
number of coins = 250
Step-by-step explanation:
number of coins × volume of one coin = volume of cylinder
number of coins = volume of cylinder / volume of one coin
= π × r^2 × h / π × r^2 × h
= r^2 × h / r^2 × h
= 8 × 8 × 10 / 0.8 × 0.8 × 0.4
= 640 / 2.56
number of coins = 250
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