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［题目］如图１，停在平直道路上的门、窗密闭的车内有一用细线悬挂着的气球．气球的质量为ｍ，体积为Ｖ·当车以加速度ａ前进时，求细线对气球的拉力． 解答１：如图２，气球向后偏移某一角度θ后便静止在车内，在重力Ｇ（＝ｍｇ）和拉力Ｔ的作用下随车一道以加速度ａ前进．
[Topic] As shown in Fig. 1, a door suspended in a straight road and a closed window has a balloon suspended in a thin line. The mass of the balloon is m, and the volume is V. When the car advances with acceleration a, seek the tension of the thin line on the balloon. Solution 1: As shown in Fig. 2, after the balloon is deflected backwards by a certain angle θ, it stays in the car. Under the action of gravity G (=mg) and pulling force T, the vehicle advances with acceleration a.