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Determine the rate of change H A of the angular momentum HA of the assembly of the plate of Prob. 18.3, assuming that it has an angular velocity ω = ω and an angular acceleration α = αj

Prob. 18.3 A thin homogeneous square of mass m and side a is welded to a vertical shaft AB with which it forms an angle of 45°. Knowing that the shaft rotates with an angular velocity ω, determine the angular momentum of the plate about A.

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