本题目来源于试卷: Vibrations and Waves，类别为 IB物理学
[问答题]
Is a rattle in a car2itc-nd*6qx .sm8; 0u2t hsrpkbqt8t ever a resonance phenomenon? hm,c : y1.rvvkExplain.
参考答案:
A
rattle in a car is very often a resonance phenomenon. The car itself vibrates in many pieces,
because there are many periodic motions occurring in the car – wheels rotating,
pistons moving up and down, valves opening and closing, transmission gears
spinning, driveshaft spinning, etc.
There are also vibrations caused by irregularities in the road surface
as the car is driven, such as hitting a hole in the road. If there is a loose part, and its natural
frequency is close to one of the frequencies already occurring in the car’s
normal operation, then that part will have a larger than usual amplitude of
oscillation, and it will rattle. This is
why some rattles only occur at certain speeds when driving.
本题详细解析:
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