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How to solve Problem 3 Suppose cantilever beam 1 (CB1) has a circular cross-section with diameter

`d_(1)`

, has a length

`L_(1)`

and is made of a material have density

`\rho `

. Another cantilever beam (CB2) has diameter

`d_(2)=2d_(1)`

and length

`L_(2)`

`=2L_(1)`

. Find the ratio of maximum bending stress in CB2 to the maximum bending stress in CB1.