UC知道关于物质的质量问题
来源：百度知道 编辑：UC知道 时间：2024/07/04 08:06:46
时间简史中有这样一段话
Perhaps the best known are the equivalence of mass and energy, summed up in Einstein’s
famous equation E=mc2 (where E is energy, m is mass, and c is the speed of light), and the law that nothing
may travel faster than the speed of light. Because of the equivalence of energy and mass, the energy which an
object has due to its motion will add to its mass. In other words, it will make it harder to increase its speed.
中间有这样一句话the energy which an
object has due to its motion will add to its mass.
就是说只要一个物体因为运动（假设速度小于光速）而使其能量增加了，那么它的质量就一定会增加
但是物质的质量不是不变的吗？
Perhaps the best known are the equivalence of mass and energy, summed up in Einstein’s
famous equation E=mc2 (where E is energy, m is mass, and c is the speed of light), and the law that nothing
may travel faster than the speed of light. Because of the equivalence of energy and mass, the energy which an
object has due to its motion will add to its mass. In other words, it will make it harder to increase its speed.
中间有这样一句话the energy which an
object has due to its motion will add to its mass.
就是说只要一个物体因为运动（假设速度小于光速）而使其能量增加了，那么它的质量就一定会增加
但是物质的质量不是不变的吗？
物质质量不变是经典物理学的说法，但是相对论并不同意这种说法，
相对论中，高速运动的物体的质量会变
相对论解释了很多经典物理学无法解释的科学现象
经典力学是相对论的在低速运动时的近似
那是经典物理学，你可以去看看量子力学。
在经典物理中,质量是不变的.或者说在速度不很大的条件下质量是不变的.
在相对论中,只有光速是不变的,质量、长度、时间都是"相对的"（可变的）。