本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理
[问答题]
Explain why the motizlf bl1w0*:wv on of a piston in an automobile en7pm va4xdyq. yl31l0m3 eje3x gine is approximately simple harmonpjy eq 1xl3m730my l xv3d4.eaic.
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. 
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