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A straight metal rod of length 3 l is be...

A straight metal rod of length `3 l` is bend through the righ angle as shown. The bend rod is then placed on a rough horizontal table. A ligh string is attached to the vertex of the right angle. The string is then pulled horizontally so that the rod slides at a constant velocity. Find the angle `alpha` that side `2l` would make with the string.
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