本题目来源于试卷: Vibrations and Waves，类别为 IB物理学
[问答题]
Explain why the motion of a p.t:o6jo he(fz8a;hbc iston in an automobile engine is approximately sim bdu*;v:eomc 8 ozo25iple harmonicu;i*d:eovzbm 2 o o85c.
参考答案: The motion of the piston can be
approximated as simple harmonic. First
of all, the piston will have a constant period while the engine is running at a
constant speed. The speed of the piston
will be zero at the extremes of its motion – the top and bottom of the stroke –
which is the same as in simple harmonic motion.
There is a large force exerted on the piston at one extreme of its
motion – the combustion of the fuel mixture – and simple harmonic motion has
the largest force at the extremes of the motion. Also, as the crankshaft moves in a circle,
its component of motion in one dimension is transferred to the piston. It is similar to Fig. 11-6. 
本题详细解析:
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