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Problem $15\mathrm{.}132-$ Relative velocity and acceleration

The instant shown, bar $AB$ has a constant angular velocity of $5\mathrm{.}000ra\frac{d}{s}$ clockwise.

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Problem $15\mathrm{.}132.$b $-$ The angular acceleration of bar DE

Determine the angular acceleration of bar $DE.($Round the final answer to three decimal places.$)$

The angular acceleration of bar $DE$ is $ra\frac{d}{s^2}$ clockwise.