52Chapt. 5Newton’s Laws and Dynamics Ithe object that start at two points used as pivot points and that go in the direction throughthe object that was downward when each of the points was the pivot point. The method failsif the two pivot points and the center of mass happen to be collinear.”a) What is anEMPIRICALmethod for finding gravitational torque, Alex?b) What is aTHEORETICALmethod for finding gravitational torque, Alex?c) What is gravitational torque, Alex?d) What is a center of mass, Alex?e) What is anEMPIRICALmethod for finding the center of mass of a rigid object, Alex?005 qmult 00670 1 5 5 easy thinking: hanger center of mass30. Where, roughly speaking, is the center of mass of a coat hanger?HINT:Imagine letting ithang from two different free pivot points: this is called a Gedanken (thought) experiment inphysics speak. If you arn’t in a testmise en sc`ene, you could actually do the experiment.a) At the end of the hook.b) At the top of the hook.c) At the left end of the triangular loop.d) Nowhere since a center of mass must be physically inside an object to be a center of mass.e) Oh, somewhere not so far from the middle region of the triangular loop.
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