At a rock concert, a db meter registered 130 db when placed 2.5 m in front of a loudspeaker on stage. (a) what was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air? (b) how far away would the sound level be 85 db?

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

How many meters will a car travel if its speed is 45 m/s in an interval of 11 seconds? question 2 options: a) 450 meters b) 495 meters c) 4.09 meters d) 498 meters