7. II FIGURE EX15.7 is the position-versus-time graph of a particle in simple harmonic motion. a. What is the phase constant? b. What is the velocity at / = 0 s? c. What is Vmax? x (cm) 1, (cm/s) 10 - 60- 30 1 (s) 0 TI(S) 4 12 -30 -10 - 60 FIGURE EX15.7 FIGURE EX15.834. H In a science museum, a 1111} kg brass pendulum hob swings at the end of a l5.mlong wire. The pendulum is started at ex actly 3:00 am. every morning by pulling it 1.5 m to the side and releasing it. Because of its compact shape and smooth surface. the pendulum's damping constant is only [Lilli] kgfs. At exactly [21H] noon. how many oscillations will the pendulum have com pleted and what is its amplitude