Chapter 15441Q15.16Yes. An oscillator with damping can vibrate at resonance with amplitude that remains constant intime. Without damping, the amplitude would increase without limit at resonance.Q15.17The phase constant must be πrad .Q15.18Higher frequency. When it supports your weight, the center of the diving board flexes down lessthan the end does when it supports your weight. Thus the stiffness constant describing the center ofthe board is greater than the stiffness constant describing the end. And then fkm=FHGIKJ12πis greaterfor you bouncing on the center of the board.Q15.19The release of air from one side of the parachute can make the parachute turn in the oppositedirection, causing it to release air from the opposite side. This behavior will result in a periodic drivingforce 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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