<p><img class=\"mceBlock\" src=\"https://s3.amazonaws.com/answer-board-image/75c

Question

<p><img class="mceBlock" src="https://s3.amazonaws.com/answer-board-image/75cac562-4b25-49a9-a9d8-0bdfd7b63b85.png" border="0" alt="uploaded image" />Four particles with masses 2 kg, 6 kg, 5 kg,<br />and 4 kg are connected by rigid rods of neg-<br />ligible mass as shown. The origin is centered<br />on the mass in the lower-left corner. The<br />rectangle is 4 m wide and 6 m long.<br /><br />If the system rotates in the xy plane about<br />the z axis (origin, O) with an angular speed<br />of 3 rad/s,</p>
<p>a)calculate the moment of inertia of<br />the system about the z axis.<br />Answer in units of kg &#183; m2</p>
<p>b)Find the rotational energy of the system.<br />Answer in units of J</p>
<p>IF YOU CAN ANSWER EITHER A OR B I WILL RATE! thanks for the help</p>

Explanation / Answer

moment of inertia I=summation of moments of all indivdual particles
I=m1r1^2+m2r2^2+m3r362+m4r4^2=0+80+208+72=360 kg-m^2

energy=1/2IW^2=1620 joules

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