- Can someone help me out with a mechanics uncertainty? Just a clarification.

PLEASE!

Question

- Can someone help me out with a mechanics uncertainty? Just a clarification.

PLEASE!

asylum15 · Answer

$$I = \frac{ \pi(D^4) }{ 64 }$$

asylum15 · Answer

What dictates the number under the line? 64 = a cylinder? 32 = ?

anonymous · Answer

D hope fully stand s for Diameter and radius=D/2
u have written I=(pi)/4 (D/2)^4  (may be i am not sure as exactly in what context u need it)

asylum15 · Answer

Pi by D to the power of 4 OVER 64. This finds I, a moment of inertia.

This is part of the formula, M/I = Stress/Y = E/R

An engineering formula

anonymous · Answer

yup that much i guessed too.. thats why i hope D stands for Diameter

asylum15 · Answer

So, any ideas?

anonymous · Answer

are u finding the MI of a circular disc

asylum15 · Answer

Of a human femur

anonymous · Answer

than i may not be correct for D as diameter

asylum15 · Answer

The femur is taken as cylinderical in this question.

asylum15 · Answer

The D doesn't matter though does it?

anonymous · Answer

D matters and usually diameter in mechanics..

anonymous · Answer

may i know from which book u r referring to

asylum15 · Answer

These are notes given to me by my lecturer. 

I believe that 64 is used when the shape being studied is a cylinder.

If a beam or irregular shape, it becomes 32 I believe..