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class="ques-origin a-pointer" target="_blank"> (2022高一下·湖南期末) </a> 某實(shí)驗(yàn)小組同學(xué)利用如圖甲所示裝置驗(yàn)證機(jī)械能守恒定律。已知當(dāng)?shù)刂亓铀俣却笮?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%3Cmn%3E9%3C%2Fmn%3E%3Cmn%3E.%3C%2Fmn%3E%3Cmn%3E8%3C%2Fmn%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmtext%3Em%3C%2Fmtext%3E%3Cmtext%3E%2F%3C%2Fmtext%3E%3Cmsup%3E%3Cmrow%3E%3Cmtext%3Es%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E2%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"><p><img width="288" height="225" src="http://tikupic.21cnjy.com/2022/08/02/82/94/8294c2d862a05d2ac359009331704f8a_330x259.png" style="max-width:100%;"></p> </h1> <ol class="q-bd-list"> <li> <div id="oqa2uos" class="question-block"> <div id="q6cuegu" class="q-mc"> <div id="siygic8" class="q-tit"> （1）小組同學(xué)想測(cè)重物的質(zhì)量，但沒(méi)有天平，該小組同學(xué)用彈簧測(cè)力計(jì)測(cè)出重物受到的重力如圖乙所示，則重物受到的重力<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;"><span id="eaki4gk" class="filling" ></span>N，再算出重物的質(zhì)量。 </div> </div> </div> <li> <li> <div id="aaqycoy" class="question-block"> <div id="oesmcko" class="q-mc"> <div id="sa2come" class="q-tit"> （2）按圖甲中所示，用手拉住紙帶使之靜止，之后應(yīng)該____ </div> <div id="ooscm8s" class="exam-s"> <span id="cckuyyi" class="op-item"><span id="0w8i4m8" class="op-item-nut">A . </span><span id="6y0mgak" class="op-item-meat">先閉合打點(diǎn)計(jì)時(shí)器所接的電源開(kāi)關(guān)，后松開(kāi)手指讓紙帶自由下落</span></span> <span id="a2ugim8" class="op-item"><span id="eyyo6ca" class="op-item-nut">B . </span><span id="8uw66mg" class="op-item-meat">先松開(kāi)手指讓紙帶自由下落，后閉合打點(diǎn)計(jì)時(shí)器所接的電源開(kāi)關(guān)</span></span> </div> </div> </div> <li> <li> <div id="gewqkuk" class="question-block"> <div id="qiwce00" class="q-mc"> <div id="wiouwwy" class="q-tit"> （3）重復(fù)三次（2）中的正確操作，在打好點(diǎn)的紙帶中挑選出一條點(diǎn)跡清晰的紙帶如圖丙所示。將打出的第一個(gè)點(diǎn)記作O，從O點(diǎn)后某個(gè)點(diǎn)開(kāi)始，依次標(biāo)為1、2、3、…，分別測(cè)出部分計(jì)時(shí)點(diǎn)到O點(diǎn)的距離，已知打點(diǎn)計(jì)時(shí)器打點(diǎn)周期<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%3ET%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmn%3E.%3C%2Fmn%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmtext%3Es%3C%2Fmtext%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，則打計(jì)時(shí)點(diǎn)“4”時(shí)重物的速度大小<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3Ev%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmo%3E%3D%3C%2Fmo%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"><span id="cige6au" class="filling" ></span>m/s。（保留三位有效數(shù)字）<p><img width="457" height="144" src="http://tikupic.21cnjy.com/2022/08/02/41/a6/41a67f18de32a18d1f859c745da962a6_525x166.png" style="max-width:100%;"></p> </div> </div> </div> <li> <li> <div id="wkusqca" class="question-block"> <div id="oqquc4w" class="q-mc"> <div id="6wmwsaw" class="q-tit"> （4）從重物開(kāi)始下落到打計(jì)時(shí)點(diǎn)“4”時(shí)，重物減少的重力勢(shì)能為<span id="mao8sek" class="filling" ></span>J（保留三位有效數(shù)字）。比較打“4”時(shí)重物的動(dòng)能，可以發(fā)現(xiàn)，在誤差允許范圍內(nèi)，重物下落過(guò)程中機(jī)械能守恒。 </div> </div> </div> <li> </ol> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div 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