A hollow shaft has outside diameter 120 mm and thickness 20 mm. Find the polar moment of inertia (J).

A hollow shaft has outside diameter 120 mm and thickness 20 mm. Find t

1.	A hollow shaft has outside diameter 120 mm and thickness 20 mm. Find the polar moment of inertia (J).
A.	16.36 × 10⁶ mm⁴
B.	14.65 × 10⁶ mm⁴
C.	10.32 × 10⁶ mm⁴
D.	23.18 × 10⁶ mm⁴
Answer» B. 14.65 × 10⁶ mm⁴