Imagine a container which contains a speaker and gas at normal pressure inside.
Now imagine it moving at almost light speed (maybe c-100m/s)
if the speaker makes a sound, causing particles to move at the speed of sound.
Would the particles moving parallel to the container’s movement move faster than light?
or is there something im missing here?
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Within the box the velocities are the velocity of sound, and in the center of mass system of box+air+speaker masses and velocities are as known.
If the whole system moves close to the velocity of light all the masses will become relativistic masses, including the atoms in the air for the speaker. The calculation will show towards a limit to the velocity of light, higher than for particles at rest in the center of mass of the system, but the velocity of light will not be attained , as far as the observer seeing the box moving with velocity close to c.
You are missing the definition of relativistic mass,that the inertial mass is not invariant to lorenz transformation, for everything that moves with velocity close to c.
anna v
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