Two friends are at a concert. they discover a location in the auditorium where the band sounds significantly louder than in other places. what is the best explanation for the strengthening of the sound?

destructive interference

medium temperature

resonance

constructive interference

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.