SOLUTION: The internal and external diameters of a hollow hemisherical vessel are 14cm and 21cm respectively.The cost of silver plating of 1cm^2 of its surface is Rs 1.60.Find the total cost

Question 550146: The internal and external diameters of a hollow hemisherical vessel are 14cm and 21cm respectively.The cost of silver plating of 1cm^2 of its surface is Rs 1.60.Find the total cost of siver plating the vessel all over.

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Surface Area of hemisphere = 2pir^2
Outside sphere radius = 10.5 (21/2)
Outside surface area = 2*pi*10.5^2
692.72 cm^2
=
Inner radius = 7 (14/2)
Inner surface area = 2 * pi^7^2
=307.87 cm^2
Total surface area =1000.59 cm^2
You have to add the rim area
internal radius = 7 cm
outer radius = 10.5
Area of rim = pi* (10.5^2-7^2)
=192.42 cm^2
Total = 692.72+307.87 192.42
=1193.01 cm^2
1193.01* 1.6=Rs.1908.81

m.ananth@hotmail.ca

RELATED QUESTIONS
The internal and external diameters of a hollow sphere are 20cm and 28cm respectively... (answered by Alan3354)

The internal and external diameters of a hollow hemisphere are 20cm and 28cm respectively (answered by Alan3354)

A hollow spherical vessel has the internal and external radii of 6cm and 6.4... (answered by ankor@dixie-net.com)

Calculate the approximate mass, in kg, of a 2.0m length of cylindrical clay pipe of... (answered by mananth)

If R and r denote the external and internal radii of a hollow right circular cylinder... (answered by Alan3354)

A cylindrical drain pipe has internal and external diameters of 6.4cm and 7.6cm... (answered by ikleyn)

A hollow metallic sphere of internal and external diameter 4 cm and 8 cm respectively is... (answered by mananth)

The volume of a frustum of a cone of height h is given by the formula V = ⅓πh(R² + (answered by math_tutor2020,ikleyn)

Show a cylinderical casting of height 8cm and external and internal diameters 9cm and 5cm (answered by KMST)