Ametal block of mass 265 g rests at a point 2.4 m from the center of a horizontal rotating wooden platform. the coefficient of static friction between the block and the platform is 0.257. the platform initially rotates very slowly but the rotation rate is gradually increasing. the acceleration of gravity is 9.8 m/s 2 . at what minimum angular velocity of the platform would the block slide away? answer in units of rad/s.

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 radius of an atom is closest in size to a

Which statements did both aristotle and ptolemy assume? check all that apply.