(adsbygoogle = window.adsbygoogle || []).push({}); 1.A rigid structure consisting of a circular hoop (on the right) of Radius R and mass m, and a square (on the left) made of four thin bars, each of length R and mass m. The rigid structure rotates at a constant speed about a verticle axis, with a period of rotation of 2.5 s. Assuming R = 0.50m and m = 2.0 kg, calculate (a) the structures rotational inertia about the axis of rotation and (b) its angular momentum about that axis

There is a picture associated with the question but i cant upload it. Basically on the left is a square then right to the right of tht is a circle and inbetween the 2 there is a line drawn shoing the axis of rotation, the square is touching the circle.

2. Rotational inertia for the hoop = 1/2 MR^2

Parallel axis theorm = Icom + MH^2

I dont know how to find the rotational inertia of the square that is composed of 4 thin bars each of length R. The rotational inertia equation for the hoop was already given to us in a previous table in the book, but nothing for a thin rod rotating about its axis type of thing.

L = Iw w=(omega)

3. i couldnt do anything for this question as i couldnt find the rotational inertia of the square, I dont know how to.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Rotational momentum (conservation problems)

**Physics Forums | Science Articles, Homework Help, Discussion**