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Q. A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle = 20°. For a speed of 39 m/s, at what value of the distance d should a driver locate his car if he wishes to stay on a circular path without depending on friction?

Q. At a rock concert, a dB meter registered 143 dB when placed 3.0 m in front of a loudspeaker on the stage.

What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air?

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Category:- Physics
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