On a workday the average decibel level of a busy street is 69 dB, with 102 cars passing a
given point every minute.
If the number of cars is reduced to 16 cars
every minute on a weekend, what is the deci-
bel level of the street? Assume that sound in-
tensity is proportional to the number of cars
passing per minute.
Answer in units of dB.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

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