why does a paper ball fall faster than a sheet of paper?

a.
gravity affects objects more when they are flat.
b.
gravity affects objects more when they take up less space.
c.
the air resistance acting on the sheet of paper is greater than the air resistance on the paper ball.
d.
the air resistance acting on the paper ball is greater than the air resistance acting on the sheet of paper.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?