A hollow Garden roller whose external diameter is 42 cm and has a length of 132 cm is made of 2 cm thick cast iron. Find the weight of the roller if 1 cm^3 of a iron weighs 10 grams.
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Answer:
Given that
diameter-42 cm
i.e- Radius 1- 21cm
Length- 132 cm
radius2- 2cm
1cm3- 10gram
solution.
22/7 ×132{(21)2 -(2)2}
22|7×132(441-4)
22/7×132×137
=56835.42857cm3
1cm3=10gram
568354.2857 gram
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