Wednesday
November 26, 2014

Homework Help: Calculus

Posted by Reonea on Sunday, October 30, 2011 at 7:33pm.

A searchlight rotates at a rate of 2 revolutions per minute. The beam hits a wall located 8 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/5? Note that d angle,dt=2(2pi)=4pi.

Speed of dot _______ = mph.

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