You have 9 stones that are identical in appearance. one of these stones weighs just a bit more than the other 8. these other 8 stones are exactly the same in weight. using a balance scale only twice, how can you determine exactly which stone is the heavier?

Does this organism still meet the definition of a eukaryote ? why or why not?

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

Un jugador de beisbol batea un foul recto en el aire.la pelota deja el bate con una rapidez de 120 km/h. en ausencia de resistencia del aire. ? cual sera la rapidez de la pelota cuando la atrape el catcher