(2)
如圖丙,是根據(jù)實(shí)驗(yàn)測(cè)得多種不同擺長(zhǎng)的振動(dòng)周期,作出的
圖像。圖線(xiàn)的斜率為k,則當(dāng)?shù)氐闹亓铀俣?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Eg%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">
。