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翻译一道英文关于力矩的数学题目

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翻译一道英文关于力矩的数学题目
3) For this question, use the material from section 1.4 (这个section是关于三角函数的)and the knowledge that the moment of a force is the cross product of the vector of the force with the vector from the axis of the turn to the point where the force is applied.
Given a wrench, prove that you can maximize the moment you can create with it by applying your
full force at the far end of the wrench, at a right angle to the wrench.
不要求解答,翻译一下再解析一下就好,看不太懂啊,解释得好有加分
他让你证明,用螺丝刀拧螺丝的时候,当力施加在螺丝刀最外端,并且施加的力和螺丝刀(也就是力臂)垂直的时候,力量最大(就是杠杆处于最省力的状态).
再问: 我已经差不多明白了,问下力矩等于力的矢量和轴到着力点矢量的向量积?还是着力点到轴?方向是哪个?