Posted by **Me** on Monday, November 14, 2011 at 9:08pm.

This question was posted earlier but the explanation given was confusing.

The three 500 g masses in the daigram are connected by massless, rigid rods to form a triangle. What is the triangle's rotational energy (in J) if it rotates at 1.50 rev/s about an axis through the center?

(Diagram shows equilateral triangle with 500g masses at each point, the distance from point to point is 40cm and it has three 60deg angles [equilateral])

- Physics -
**bobpursley**, Monday, November 14, 2011 at 9:20pm
find the distance from the corner to the center of the square.

moment of intertia= 3*massoncorner*distance^2

energy: 1/2 Momentinertia*(1.50*2PI)^2

- Physics -
**Me**, Monday, November 14, 2011 at 9:30pm
It still did not come out correctly

I took cos60=.2/x and got .4 for the distance then did 3*.5*(.4)^2 and got .24 and then did 1/2(.24)(9.42)^2 and got 10.66J which is incorrect...

- Physics -
**Me**, Monday, November 14, 2011 at 9:33pm
nevermind I forgot the divide the angle...thanks!

## Answer This Question

## Related Questions

- Physics help please! - The three 500 g masses in the daigram are connected by ...
- Physics - The three 500 g masses in the daigram are connected by massless, rigid...
- Physics - Two masses m are attached to two vertices of an equilateral triangle ...
- Physics - Three masses are connected by massless rigid rods. Rods AC and CB have...
- Physics HELP!! - Three masses are connected by massless rigid rods. Rods AC and ...
- Physics - KE/Inertia - The rigid body shown in Figure 10-66 (it is a triangle ...
- physics - Four masses are arranged as shown. They are connected by rigid, ...
- physics - Three balls A, B, and C, with masses of 3 kg, 1 kg, and 1 kg, ...
- Physics !>:( - Four masses are connected by 27.1cm long, massless, rigid rods...
- Physics - KE/Inertia - The rigid body shown in Figure 10-66 (it is a triangle ...

More Related Questions