2023年中考物理模擬試題八參考答案.doc

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上傳時間：2022-12-18

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20、TTOM: 0cmDIV.MyFav_1308537836298 ULMARGIN-BOTTOM: 0cm一、填空題題號12345678910選項ACABDBDCDA二、不定項選擇題題號11121314選項BCCACBC三、填空題15虛；5。16不一定；左。17做功；不一定。183；3。19大于；下。2084107；025。21電磁波；電。四、綜合題2223（1）水結冰體積變大，對鋁膜產(chǎn)生強大力的作用，使鋁膜和鋼罐牢牢壓在一起。（2）汽車的水箱裝滿水，冬天容易被凍裂；自來水管，冬天水結冰體積變大，將水管脹裂。24解：（1）C（2）解法一：B把電阻箱阻值調(diào)到0，讀出此時電壓表示數(shù)U0；C把電阻箱

21、阻值調(diào)到較大值（幾千歐），讀出此時電阻箱阻值R1和電壓表示數(shù)U1。解法二：B調(diào)節(jié)電阻箱阻值為R1（幾千歐），讀出此電壓表示數(shù)U1；C調(diào)節(jié)電阻箱阻值為R2（幾千歐），讀出此時電壓表示數(shù)U2；25（2）（3）26（1）在動滑輪上掛2個鉤碼，用測力計勻速豎直向上拉繩子自由端。鉤碼質(zhì)量用m來表示，測力計示數(shù)用F來表示，鉤碼上升高度用來表示h，繩子自由端移動距離用s來表示。用測力計測出F，用刻度尺測出s、h。（2）保持動滑輪所掛鉤碼個數(shù)不變，依次改變繩子自由端移動距離，多次重復步驟（1）。（3）利用W=Fs算出各次總功，W=Gh=mgh算出各次有用功，然后再分析有用功隨總功變化規(guī)律。27（1）（2）28通過觀察、比較膠棒蓋露出液面的高度來鑒別醬油和陳醋密度的大小。改進方法：將膠棒蓋開口朝上分別放人醬油和陳醋中，向膠棒蓋里增減米粒直至液面在膠棒蓋上的位置兩次相同。根據(jù)阿基米德原理，兩次液面在膠棒蓋上的位置相同即V浸相同，米粒越多G越大，則密度越大。第 10 頁

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