Wednesday
July 30, 2014

Homework Help: physics

Posted by Gk on Friday, September 20, 2013 at 10:49am.

Cheerleaders at sporting events will often use a bullhorn to make themselves louder. A bullhorn is simply a hollowed out cone - you speak into the narrow end and your voice comes out the wide end, channeled by the cone so it is louder than it would be otherwise. At a sporting event, a cheerleader holds a bullhorn up to their mouth as in the figure below. The very tip of the bullhorn rests on their mouth and they use their hand on the other end to hold the bullhorn horizontal and still. We model the bullhorn as the rigid 2-d hollow cone of horizontal length 0.75 m, opening angle 30∘, and (surface) mass density of 0.4 kg/m2 (see figure). How much force in Newtons does the cheerleader exert at point A?

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