Posted by **saud** on Sunday, October 30, 2011 at 6:50pm.

A searchlight rotates at a rate of 4 revolutions per minute.?

The beam hits a wall located 13 miles away and produces a dot of light that moves horizontally along the wall. How fast (in miles per hour) is this dot moving when the angle between the beam and the line through the searchlight perpendicular to the wall is pi/6? Note that dtheta/dt=4(2pi)=8pi.

- calculus -
**bobpursley**, Sunday, October 30, 2011 at 7:07pm
see other post

- calculus -
**Anonymous**, Wednesday, November 12, 2014 at 12:05pm
12

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