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mechanics of materials

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The second moment of area of a hollow cylindrical beam with an inner radius of 18mm and an outer radius of 20mm is equal to
A) 2.7x10-9m 4
B) 4.3x10-8 m 4
C) 7.9x10 - 13m 4
D) 2.7x10 3 m 4

  • mechanics of materials -

    J=π(D²-d²)/32 =...

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