Shear and moment: two identical 20-mm thick plates are bolted to the top and bottom flange to form the built-up beam.
a) if the beam is subjected to a shear force of v = 250 kn, determine the allowable maximum spacing s of the bolts to the nearest mm. assume each bolt has a shear capacity of 30 kn, and i = 307.5e-6 m4 .
b) what is the mp (plastic moment) of the beam assuming bolts can take infinite shear and y = 250 mpa

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?