[Picture on LEFT is second part of question SORRY!]
A)The diagram (on the right) shows a uniform thick sperical shellthat will rotate about its diameter. The shell has a mass of M, andinner and outer radii equal to half the outer radius. Find themoment of inertia for the shell. Express your answer in terms ofthe mass of the shell, M and the outer radius, R.
When using I=2/5Mr^2 All I got was the very first step :
I=2/5Mr^2 - 2/5M(1/2r)^2
B) Now the shell is made to rotate about an axis thru its outerskin. Find the new moment of inertia for this rotation. Againexpress your answers in terms of the mass of the shell, M, and theouter radius, R.
The only clue I have is to use the parallel axis thereom (whichjust confuses me) it looks like:
I p.a.= I c.m. + M(d)^2 where d is the distance from the centermass to the actual rotation.
THANK YOU FOR ANY HELP I WILL RATE IF IT MAKES A LITTLE SENSE!
