03/28/08 Physics 201 Quiz 15 Two sticks of length L are connected at one end to form a 90 degree angle. a) find the center of mass of the pair of sticks. ans: the com of each stick is at L/2. The com of the pair lies on the bisector of the 90 degree angle, a distance L/2*cos(45)=L/sqrt(8) from the vertex. b) The stick pair (mass M) is hung on the wall by a nail at one of the ends (not the vertex) and comes to rest at the place of lowest potential energy. What kinetic energy would have to be given the pair in order for it to spin around by 360 degrees? ans: At the lowest point, the com is directly below the nail, so we need the
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