At a rock concert, a dB meter registered 135 dB when placed 2.2 m in front of a loudspeaker on the stage.

1) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air?
2) How far away would the sound level be a somewhat reasonable 95 dB?

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?