Question

Need help revising for exam tomorrow.
Assuming that the oar is of a uniform cross sectional area, A, has a Length L, and a second moment od area I. The density of the material is made from p. what is the mass, m of the oar? I shall put a diagram in the comments.

Answer 1

part b) Assuming that the deflection of a simple supported beam, D when is subjected to a load F is. \[D=\frac{ FL^3 }{ C{1} EI}\] Calculate the stiffness of the beam S.

Answer 2

Part c) For a circular section \[\frac{ A^{2} }{3\pi }\]. By Eleminating the cross sectional area, derive an equation for the mass of the oar and from this identify the materials index that will give the most suitable materials for use as a competitive oar

Answer 3

"Assuming that the oar is of a uniform cross sectional area, A, has a Length L, and a second moment od area I. The density of the material is made from p. what is the mass, m of the oar? "

if by "second moment od area" , you mean moment of inertia, you need to specify about where it is being calculated.

there's a list here and you might choose to model it as a rod or cylinder...oe whatever you like.

https://en.wikipedia.org/wiki/List_of_moments_of_inertia