An unknown sample required 21.05ml of 0.02047 m kmno4 to reach the endpoint. how many moles of kmno4 reacted? (m=mol over liter)
a.0.43089 mol
b.0.04309 mol
c.0.004309 mol
d.0.0004309 mol

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?

Una carga puntual de 3 x 10-6 c se coloca a 12 cm de una segunda carga puntual de - 1,5 x 10-6 c. calcular la magnitud fuerza eléctrica entre las cargas

Could we see a galaxy that is 20 billion light-years away?