Differential moment of inertia

kyu · Jul 13, 2014

Homework Statement

since it's asking us to find the moment of inertia with respect to y-axis, why did they draw the differential element to x-axis?

because of the initial problem.. i don't know how to start.. so

dA = x dy
I(y) = x^2 (x dy)

Simon Bridge · Jul 14, 2014

since it's asking us to find the moment of inertia with respect to y-axis, why did they draw the differential element to x-axis?

... they show an element width dy and length x at position y=x^3.
How would you do it?