3 ms·
You're in a rocket-ship, the speedometer reads 0.5c (half-lightspeed); How fast are you going? If you understand you'll ask "from what frame of reference?"
by Chris2048 6y ago
You're in a rocket-ship, the speedometer reads 0.5c (half-lightspeed); How fast are you going?
If you understand you'll ask "from what frame of reference?"
- AlexTWithBeard 6y agoI wonder... If there were such a speedometer what would it use as a reference in real life? Earth? Sun? Sag A?
- rtkwe 6y agoMost useful in space depends a lot on what you're doing at the time. Docking with small separation? Velocity relative to target. Orbiting something? speed relative to that body. Traveling between stars? Tougher but most likely relative velocity towards your target since your path is going to be relatively linear?
- icedistilled 6y agoBut you can easily answer "I'm going 0.5c from the frame of reference the speedometer uses"
- Chris2048 6y agoBut the point is you need to understand what speed is.