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CrusaderSean

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my homework problem deals w/ rotation in x-y plane. so the tensor is only 2d. inertial tensor still seems obscure to me... my question for now is purely mathematical. assuming the basis are (x,y). I calculated the components of I, is the following correct?

[tex]I_{xx} = m_i y_{i}^{2}[/tex]

[tex]I_{yy} = m_i x_{i}^{2} [/tex]

[tex]I_{xy} = I_{yx} = - m_i x_i y_i [/tex]

for some reason my professor wrote...

[tex]I_{xx} = m_i x_{i}^{2} [/tex]

and I'm pretty sure its not right

[tex]I_{xx} = m_i y_{i}^{2}[/tex]

[tex]I_{yy} = m_i x_{i}^{2} [/tex]

[tex]I_{xy} = I_{yx} = - m_i x_i y_i [/tex]

for some reason my professor wrote...

[tex]I_{xx} = m_i x_{i}^{2} [/tex]

and I'm pretty sure its not right

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