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在船上发射炮弹,从不同的参照系看,火药释放的能量相同吗?看一实例:设质量为M的轮船以速度V行驶,向其行进方向水平发射一质量为m的炮弹,炮弹出口速度为u(对船).试问炮弹的动能为多大?火药对炮弹做了多少功?火药释放的能量为多大?
When launching artillery shells on board, can the gunpowder release the same amount of energy from different frames of reference? Let’s look at an example: Let a ship of mass M travel at speed V and launch a projectile of mass m horizontally in its direction of travel. For u (for the ship). How much is the kinetic energy of the projectile? How much is the gunpowder done for the projectile? How much energy does the gunpowder release?