Homework Help: physics- vry urgent

Posted by sweety on Tuesday, April 28, 2009 at 11:58pm.

A human wave. During sporting events within large, densely packed stadiums, spectators will send a wave (or pulse) around the stadium (Fig. below). As the wave reaches a group of spectators, they stand with a cheer and then sit. At any instant, the width w of the wave is the distance from the leading edge (people are just about to stand) to the trailing edge (people have just sat down). Suppose a human wave travels a distance of 859 seats around a stadium in 40.0 s, with spectators requiring about 1.80 s to respond to the wave's passage by standing and then sitting. What are (a) the wave speed v (in seats per second) and (b) width w (in number of seats)?

physics- vry urgent - Javen, Wednesday, April 29, 2009 at 12:46am
A humming bird beats its wings up and down with a frequency of 80 Hz. What is the period of the humming bird's flaps.
physics- vry urgent - sweety, Wednesday, April 29, 2009 at 6:19am
time period= 1/frequency

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