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Unformatted text preview: PHYS 3202 Classical Mechanics II - Quiz #1 Please write your name. Conceptual (circle ALL that apply - there may be one or more correct items in each problem) 1. (4 points) Several stars are interacting gravitationally, and have nonzero total momentum. If external forces are neglected, which of the following quantities remain constant in time? A. Position of the center of mass B. Velocity of the center of mass C. Angular velocity about the center of mass D. Angular momentum about the center of mass E. Kinetic energy relative to the center of mass 2. (1 point) If a systems Lagrangian is L = L ( q 1 ,q 2 , q 1 , q 2 ,t ), is dL dt usually equal to L t ? Yes No 3. (3 points) Suppose that quantity P = P ( q 1 ,q 2 , q 1 , q 2 ,t ) of a system is conserved. A. P remains constant during the systems time evolution. B. P must take the same value for all different initial conditions of the system....
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