Question

下圖所示為一簡(jiǎn)諧運(yùn)動(dòng)的圖像，則下列說(shuō)法正確的是

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A．該質(zhì)點(diǎn)的振動(dòng)周期為0.7 s

B．該質(zhì)點(diǎn)的振幅為10 cm

C．該質(zhì)點(diǎn)在0.1 s和0.5 s時(shí)的振動(dòng)速度最大

D．該質(zhì)點(diǎn)在0.3 s和0.7 s時(shí)的加速度為零

Answer 1

答案：D
解析：

從函數(shù)圖像看，該質(zhì)點(diǎn)的振動(dòng)周期為2(0.7－0.3)＝0.8(s)，該質(zhì)點(diǎn)的振幅為5 cm，該質(zhì)點(diǎn)在0.1 s和0.5 s時(shí)的振動(dòng)速度均為0，排除A、B、C．