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I can not find a formula to calculate the following question, any help would be appreciated, ty AlephZero for helping me clarify my question.

An example in my problem set (homework help)

An oak rod is hung from a rigid support. The rod has a diameter = 13 mm, length = 7 m, and a catch plate at its base.

a) The maximum mass of a weight that each rod can support.

b) The minimum mass of a weight that will break the rod when dropped from the top of the rod.

c) The maximum mass of weight that when dropped from the top of the rod will not result in permanent deformation of the rod.

Numbers I think can be used:

E (stiffness) = 14000 MPa

Yield Tensile strength = 75 MPa

Ultimate tensile strength = 90 MPa

An example in my problem set (homework help)

An oak rod is hung from a rigid support. The rod has a diameter = 13 mm, length = 7 m, and a catch plate at its base.

a) The maximum mass of a weight that each rod can support.

b) The minimum mass of a weight that will break the rod when dropped from the top of the rod.

c) The maximum mass of weight that when dropped from the top of the rod will not result in permanent deformation of the rod.

Numbers I think can be used:

E (stiffness) = 14000 MPa

Yield Tensile strength = 75 MPa

Ultimate tensile strength = 90 MPa

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