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3d
如果一个物体从无穷远处自由落体到地球,速度最终会超光速吗?
若从自由落体的持续加速角度理解,物体的速度确如您所述,看似应能突破光速的限制,顺着F=ma这一牛顿力学公式的逻辑,得出这一结论看似顺理成章。但在低速世界的物理学范畴内,F=ma仅是一个便捷的近似值,事实上,随着物体速度的增加,维持其加速度所需之力是递 ...
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6d
为什么火箭飞出去的时候没事,飞船回来就要燃烧呢?关键在于速度
火箭发射升空,那场面,简直酷炫!可是,为啥返回舱回来的时候,总是被烧得像块黑炭呢?
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