The hubble constant, $h_{0}$, is the ratio of the recessional velocity of a galaxy to its distance. the hubble constant is estimated to be 70 km/sec per million parsecs of distance. (one parsec is equal to 3.26 light years.) based on this ratio, how many billions of light years away would a galaxy be if it had a recessional velocity of 300,000 km/sec?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

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

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?