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今年某地区高三联考有这样一道题:一个物体质量是1千克.若在人造地球同步卫星上用天平称量该物体的质量时,积量的结果是__. 标准答案是零.笔者认为该答案是欠妥的. 众所周知,物理天平是等臂杠杆.用天平称物体质量的原理是:被作物体对载物盘底的压力产生的力矩.跟砝码对砝码盘底的压力产生的力矩相等时,则天平平衡;在水平面上物体对平而的压力大小在数值上等于物体的重力,而重力跟质量成正比;又在同一地点,重力加速度相等,所以砝码的质量数就是被称物体的质量数.在人造地球同步卫星上,物体处于完全失重状态,互相叠放的物体之间不再产生压力,此时用天平称
This year, a high school triple examination in a certain area has such a question: The mass of an object is 1 kg. If the mass of the object is weighed using a scale on a man-made geosynchronous satellite, the result of the product is __. The standard answer is zero. The answer is incorrect. As we all know, the physical balance is the arm lever. The principle of using the balance to describe the mass of the object is: the moment generated by the crop body to the pressure on the bottom of the load plate. The weight is generated with the weight on the bottom of the weight plate. When the moments are equal, the balance is balanced; in the horizontal plane, the pressure of the object on the flat is numerically equal to the weight of the object, and the gravity is proportional to the mass; in the same place, the acceleration of gravity is equal, so the mass of the weight is The mass number of the object being called. On the artificial geostationary satellite, the object is in a state of total weightlessness and no pressure is generated between the objects stacked on top of each other.