the external and the internal radii of a hollow cylindrical metallic vessel 56 cm long are 10.5 cm and 10.1 CM respectively find the cost of the metal contained by the vessel at Rs 2 per cubic CM also find the cost of polishing its outer surface at 20 Paisa per square cm
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Answer:
cost of metal = Rs 922.88
Step-by-step explanation: Rs 13.16
cross-sectional area of hollow cylinder
= pi*r^2 - pi*R^2
=pi*10.5^2 - pi*10.1^2
= 8.24cm sq
volume of metal
= 8.24*56
=461.44cm cube
cost = 2*461.44 = Rs 922.88
outer surface of cyclinder
=2*pi*r
=2*pi*10.5
=65.97cm sq
cost of polish
= 65.97*0.2
= 13.19
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