How does the intensity of a sound wave change if the distance from the source is increased by a factor of 3?
A. The intensity decreases by a factor of 9.
B. The intensity decreases by a factor of 3.
C. The intensity increases by a factor of 9.
D. The intensity increases by a factor of 3.

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Difference between series and parallel circuits

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).