A vertical member is subjected to an axial impact by a 100-lb weight dropped from a
height of 2 ft (similar to Figure 7.4a). The member is made of steel, with Sy = 45 ksi,
E = 30 * 106 psi. Neglect the effect of member mass and stress concentration. What
must be the length of the member in order to avoid yielding if it has a diameter of
(a) 1 in., (b) 11 in., (c) 1 in. for half of its length and 11 in. for the other half?

Question

A vertical member is subjected to an axial impact by a 100-lb weight dropped from a
height of 2 ft (similar to Figure 7.4a). The member is made of steel, with Sy = 45 ksi,
E = 30 * 106 psi. Neglect the effect of member mass and stress concentration. What
must be the length of the member in order to avoid yielding if it has a diameter of
(a) 1 in., (b) 11 in., (c) 1 in. for half of its length and 11 in. for the other half?