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Here,  

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{latex}
$$\ddot{r} $$ 
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  is 0 because the radius is constant (i.e the blade is fixed in the radial direction).

The radial force is simply equal to,

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Substituting the radial acceleration and expressing angular velocity as 

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$\omega$
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we get:

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$$F_r = m r \omega^2$$
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2. Simple Bending Moment Calculation

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