439_Physics ProblemsTechnical Physics

439_Physics ProblemsTechnical Physics - Chapter 15 441...

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Chapter 15 441 Q15.16 Yes. An oscillator with damping can vibrate at resonance with amplitude that remains constant in time. Without damping, the amplitude would increase without limit at resonance. Q15.17 The phase constant must be π rad . Q15.18 Higher frequency. When it supports your weight, the center of the diving board flexes down less than the end does when it supports your weight. Thus the stiffness constant describing the center of the board is greater than the stiffness constant describing the end. And then f k m = F H G I K J 1 2 π is greater for you bouncing on the center of the board. Q15.19 The release of air from one side of the parachute can make the parachute turn in the opposite direction, causing it to release air from the opposite side. This behavior will result in a periodic driving force that can set the parachute into side-to-side oscillation. If the amplitude becomes large enough, the parachute will not supply the needed air resistance to slow the fall of the unfortunate skydiver.
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