<PRE><B>Question 966306</B>
The windshield wiper of a car is 18 inches long.
 If it takes 1 second to trace out 1/3 revolution, how fast is the tip of the wiper moving?
:
Find the cicumference, like the 18&quot; windshielf wiper made a complete revoluton
{{{C = 2*pi*18}}}
C = 113.1 inchec
Find 1/3 of a revolution
{{{113.1/3}}} = 37.7&quot;, the distance moved by the wiper in 1 sec
there
37.7 in/sec is the speed of the tip of the wiper</PRE>