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Phys 461/561 Fall 2009 Worksheet #20 Monday, November 30, 2009 Name Questions (5 pts): Consider vibrations of a circular drumskin of radius a. It is known that: (i) Its circumference is held fixed in the plane at all times (ii) Initially, at time t = 0, the displacement from the equilibrium u is a function of only (iii) Initially, at time t = 0, the velocity is zero. Based on the information above, right down boundary and initial conditions (which we will use) together with the wave equation of motion.