Tube Ring
Posted on Friday, December 24, 2010 in Photography
Please could you help, Find the volume of a tube of length 20cm. There is a outer ring and a inner circle..?
The inner radius is 3cm and the outer radius is 5cm?
The volume of a cylinder is given by the following expression:
V = 2Pi*(r^2)*h, where r = radius and h = height or length
-notice that this is simply the area of a circle multiplied by a length
Let's calculate the volume of the outer tube:
Vo = 2Pi(r^2)*h
Vo = 2Pi(5^2)*20
Vo = 2Pi(25)*20
Vo = 1000Pi
Let's calculate the volume of the inner tube:
Vi = 2Pi(r^2)*h
Vi = 2Pi(3^2)*20
Vi = 2Pi(9)*20
Vi = 360Pi
To find the volume of the ring, subtract the volume of the inner tube from the volume of the outer tube:
Vr = Vo - Vi
Vr = 1000Pi - 360Pi
Vr = 2010.619298 cm^3
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