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What works has to be performed to make a...

What works has to be performed to make a hoop out of a steel band of length `l,` width h and thickness `delta?` The process is assumed to proceed within the elasticity range of the material.

A

`pi^2Ebdelta^3//l`

B

`pi^3Ebdelta^3//l`

C

`pi^4Ebdelta^3//l`

D

`pi^5Ebdelta^3//l`

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The correct Answer is:
A
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