Which of the following is the best example of a proper hypothesis?
water will flow faster through tightly packed soil than through loosely packed soil.
i think there is no effect on hearing if you listen to loud music for only three hours a day.
grapes taste better than apples because grapes are sweeter.
if different types of leaves are exposed to low temperatures, then they will change colors.

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.