Moment of inertia:

$\overline{){\mathbf{I}}{\mathbf{=}}{\mathbf{m}}{{\mathbf{r}}}^{{\mathbf{2}}}}$

I = mr^{2}

Kinetic energy:

$\overline{){\mathbf{K}}{\mathbf{.}}{\mathbf{E}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{2}}{\mathbf{I}}{{\mathbf{\omega}}}^{{\mathbf{2}}}}$

**(a)**

I = mr^{2} + mr^{2} + mr^{2 }= 3mr^{2}

r is the distance from the center to the vertex.

The three 190 g masses in the figure (Figure 1) are connected by massless, rigid rods.

**(a)** What is the triangle's moment of inertia about the axis through the center? Express your answer to two significant figures and include the appropriate units.**(b)** What is the triangle's kinetic energy if it rotates about the axis at 4.4 rev/s? Express your answer to two significant figures and include the appropriate units.

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