The thickness of a rectangular steel girder equals h. Using the equation of Problem 1.301, find the deflection λ, caused by the weight of the girder in two cases:
(a) One end of the girder is embedded into a wall with the length of the protruding section being equal to l (Fig. 1.78a);
(b) The girder of length 2l rests freely on two supports (Fig. 1.78b).

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(a) 21 (b) Fig. 1.78.