What initially prevented African Americans from playing baseball in the major leagues? 1. An official rule established by the Commissioner of Baseball
2. An unofficial agreement between baseball owners
3. A law passed by Congress
4. Racism on the part of major league baseball players

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?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

What is a subatomic particle with a negative charge and very little mass?