• 2021-04-14
    如图(A)所示,mA>μmB时,算出mB向右的加速度为a,今去掉mA而代之以拉力T=mAg,如图(B)所示,mB的加速度变为a´,则https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/67f69907d4e74d1b87764e1f84c1e423.png
  • 举一反三