某同學(xué)探究彈力與彈簧伸長(zhǎng)量的關(guān)系.                                                                   

①將彈簧懸掛在鐵架臺(tái)上,將刻度尺固定在彈簧一側(cè),彈簧軸線和刻度尺都應(yīng)在         方向(填 “水平”或“豎直”)        

                  L0     Lx     L1     L2     L3   L4     L5     L6

數(shù)值(cm)        25.35        27.35      29.35        31.30    33.4 35.35      37.40      39.30

②彈簧自然懸掛,靜止時(shí),長(zhǎng)度記為L(zhǎng)0,彈簧下端掛上砝碼盤時(shí),長(zhǎng)度記為L(zhǎng)x;在砝碼盤中每次增加10g砝碼,彈簧長(zhǎng)度依次記為L(zhǎng)1至L6,數(shù)據(jù)如上表:表中有一個(gè)數(shù)值記錄不規(guī)范,代表符號(hào)為              .由表可知所用刻度尺的最小刻度為                                                                                                               

③如圖是該同學(xué)根據(jù)表中數(shù)據(jù)作的圖,縱軸是砝碼的質(zhì)量,橫軸是彈簧長(zhǎng)度與    LX 的差值(填“L0或LX”).         

④由圖可知彈簧的勁度系數(shù)為                                                                   N/m;通過(guò)圖和表可知砝碼盤的質(zhì)量為           g(結(jié)果保留兩位有效數(shù)字,重力加速度取9.8m/s2).

                                                                                    

                                                                                                                               


①豎直;②L3 ,1mm;③Lx;④4.9,10


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