19. REASONING Note from the drawing that the shaded right triangle contains the angle e, the side opposite the angle (length = 0.281 nm), and the
side adjacent to the angle (length = L). If the length L
can be determined, we can use trigonometry to find 0.
The bottom face of the cube is a square whose diagonal
0.281 nm
has a length L. This length can be found from the
Pythagorean theorem, since the lengths of the two sides
e
of the square are known.
0.281 nm

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?