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A solid body rotates with angular veloci...

A solid body rotates with angular velocity `omega=ati+bt^2j`, where `a=0.50rad//s^2`, `b=0.060rad//s^3`, and `i` and `j` are the unit vectors of the x and y axes. Find:
(a) the moduli of the angular velocity and the angular acceleration at the moment `t=10.0s`,
(b) the angle between the vectors of the angular velocity and the angular acceleration at that moment.

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