Question

某同學探究彈力與彈簧伸長量的關系．                                                                   

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

                  L₀     L_x     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，長度記為L₀，彈簧下端掛上砝碼盤時，長度記為Lx；在砝碼盤中每次增加10g砝碼，彈簧長度依次記為L₁至L₆，數(shù)據(jù)如上表：表中有一個數(shù)值記錄不規(guī)范，代表符號為              ．由表可知所用刻度尺的最小刻度為                                                                                                                ．

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

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

                                                                                    

                                                                                                                               

Answer 1

①豎直；②L₃ ，1mm；③L_x；④4.9，10