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考题:[2013江苏高考第11题]某兴趣小组利用自由落体运动测定重力加速度,实验装置如图所示。倾斜的球槽中放有若干个小铁球,闭合开关K,电磁铁吸住第1个小球。手动敲出弹性金属M,M与触头瞬间分开,第1个小球开始下落,M迅速恢复,电磁铁又吸住第2个小球。当第1个小球撞击M时,M与触头分开,第2个小球丌始下落……。这样,就可测出多个小球下落的总时间。(1)在实验中,下列做法正确的有____。A.电路中的电源只能选用交流电源B.实验前应将M调整到电磁铁的正下方C.用直尺测量电磁铁下端到M的竖直距离作为小球下落的高度D.手动敲击M的同时按下秒表开始计时(2)实验测得小球下落的高度H=1.980m,10个
Test Questions: [2013 Jiangsu Entrance 11] a group of interest using free-fall motion determination of gravitational acceleration, the experimental setup as shown. Tilt the ball slot put a number of small iron ball, switch K is closed, the magnet sucked the first ball. Manually knocked out the elastic metal M, M and the contact instantly separated, the first ball began to fall, M quickly restored, the electromagnet and the second ball sucked. When the first ball hits M, M separates from the contact and the second ball does not fall. In this way, you can measure the total number of drops of the ball. (1) In the experiment, the following practices are correct ____. A. The power supply in the circuit can only be selected AC power B. M before the experiment should be adjusted to just below the electromagnet C. Use the ruler to measure the vertical distance from the lower end of the electromagnet to M as the drop height of the ball D. Manual knock Hit the M while pressing the stopwatch to start the timer (2) experimentally measured the height of the ball drop H = 1.980m, 10