The base structure of the firetruck ladder rotates about........... The base str

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The base structure of the firetruck ladder rotates about...........

The base structure of the firetruck ladder rotates about a vertical axis through O with a constant angular velocity Ohm = 10 deg/s. At the same time, the ladder unit OB elevates at a constant rate Greek phi = 7 deg/s, and section AB of the ladder extends from within section OA at the constant rate of 0.5 m/s. At the instant under consideration, Greek phi = 30degree, OAr = 9m, and AB = 6 m. Determine the magnitudes of the velocity and acceleration of the end B of the ladder.

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