What is the ratio of the sun’s gravitational pull on mercury to the sun’s gravitational pull on the earth?
a. the radius of the orbit of mercury is rm= 5.79× 1010m and its mass is mm= 3.30× 1023kg.
b. the radius of the orbit of earth is re=1.50× 1011m and its mass is me=5.97×1024kg.

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?