Problem 1.303

The thickness of a rectangular steel girder equals $h .$ Using the equation of Problem 1.301 , find the deflection $\lambda$ 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. $1.78 a$ ); (b) the girder of length $2 l$ rests freely on two supports (Fig. $1.78 b$ ).