At a country music festival in New Hampshire, the Oak Ridge Boys are playing at the end of a crowded 184-m field when Ronny Fairchild hits a note on the keyboard that has a frequency of 400. Hz. a) How many full wavelengths are there between the stage and the last row of the crowd?
b) How much delay is there between the time a note is played and the time it is heard in the last row?

Explanation:

a )  

wavelength = velocity of sound / frequency

= 340  / 400 m

= .85 m

No of full wavelengths required = 184 / .85

= 216.47

b ) Time taken by sound to travel a distance of 184 m

distance / velocity

= 184 / 340 s

= .54 s .

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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