A cylindrical road roller made of iron is 1 m long, Its internal diameter is 54 cm and the thickness of the iron sheet used in making the roller is 9 cm. Find the mass of the roller, if 1 cm³ of iron has 7.8 gm mass. (Use π = 3.14)

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Solution

We have to find the mass of the roller.

Radius of inner cylinder

Radius of outer cylinder

Length of the cylinder

So, volume of iron,

It is given that, 1 of iron has a mass of 7.8 gm.

So the mass of iron used,

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A hollow garden roller of 42 cm diameter and length 152 cm is made of cast iron 2 cm thick. Find the volume of iron used in the roller.

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