Check my answers?
an astronomer sees two stars in the sky. both stars are equally far from earth, but the first star is brighter than the second star. which of the following is a valid conclusion about the first star?

it is larger than the second star.
it is smaller than the second star.
it is older than the second star.
it is younger than the second star.

i think it is c but i think i read something about younger stars being brighter.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel

Why are nonmetals more likely to react with eachother by sharing electrons