Noah and nina are 15 m apart in a closed room. noah says the same sentence twice. the first time, nina does not hear the sound, but she does hear the sentence the second time.

the real answer is,

C)The air molecules in the compression of the second wave are more dense, so the sound is louder.and the full answer for anyone wondering is...

Noah and Nina are 15 m apart in a closed room. Noah says the same sentence twice. The first time, Nina does not hear the sound, but she does hear the sentence the second time.

What best describes the difference between the second sound wave and the first?

A) The second sound wave reflects off the walls of the room, so Nina is able to hear the sound.

B) The second sound wave travels faster to Nina, so less energy is dissipated through the air.

C) The air molecules in the compression of the second wave are more dense, so the sound is louder.

D) The air molecules in the second wave are spaced evenly, so a high-frequency wave is produced.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached