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Practice #2 14.45 You pull a simple pendulum 0.240 m long to the side through an angle of 3.50° and release it. (a) How much time does it take the pendulum bob to reach its highest speed? (b) How much time does it take if the pendulum is released at an angle of 1.75° instead of 3.50° a) 0.25 s; 0.25 s b) 0.25 s; 0.98 s c) 0.98 s, 0.25 s d) 0.98 s; 0.98 s

14.62A mass is vibrating at the end of a spring of force con- stant 225 N/m. Figure E 14.62 shows a graph of its position x as a function of time t. ( Atti hettimes is theft SHOH toring? (b) How much energy did this system originally contain? (c) How much energy did the system lose between t1.0 s and 4.0s? Practice #4 Figure E14.62 (cm) Ил t(s) a) .25 J; 0.15 J b) .35 J; 0.20 J c) 45 J; 0.25 J d) .55 J 0.30 J e) .65 J 0.35 J -5

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