A storage tank consists of a circular cylinder with a hemisphere at join on either end .if the external diameter of the cylinder be 1.4 M and its length be 8 m. find the cost of painting it on the outside at the rate rupees 10 per metre square.

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Solution

Diameter of a cylinder= 1.4m
Therefore radius of cylinder= 1.4/2=0.7m
Height of cylinder= 8m.
Therefore surface area of tank= 2πrh+2πr^2
=2×22/7×0.7×8+2×22/7×(0.7)^2
=176/5 + 77/25
= 38.28m^2
Now cost of 1m^2= Rs.10
Therefore cost of 38.28m^2
= 38.28 X 10
= Rs.382.80

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A storage tank consists of a circular cylinder with a hemisphere at join on either end .if the external diameter of the cylinder be 1.4 M and its length be 8 m. find the cost of painting it on the outside at the rate rupees 10 per metre square.

Diameter of a cylinder= 1.4m Therefore radius of cylinder= 1.4/2=0.7m Height of cylinder= 8m. Therefore surface area of tank= 2πrh+2πr^2 =2×22/7×0.7×8+2×22/7×(0.7)^2 =176/5 + 77/25 = 38.28m^2 Now cost of 1m^2= Rs.10 Therefore cost of 38.28m^2 = 38.28 X 10 = Rs.382.80

Diameter of a cylinder= 1.4m
Therefore radius of cylinder= 1.4/2=0.7m
Height of cylinder= 8m.
Therefore surface area of tank= 2πrh+2πr^2
=2×22/7×0.7×8+2×22/7×(0.7)^2
=176/5 + 77/25
= 38.28m^2
Now cost of 1m^2= Rs.10
Therefore cost of 38.28m^2
= 38.28 X 10
= Rs.382.80