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by PaulAJ
2114 days ago
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> [..] while the electrical energy input only increases linearly with time. This is the fallacy. In an electric motor the power required to exert a force is proportional to the speed, so if you want to keep the acceleration constant you need to increase the electrical power (i.e. rate of energy use) linearly over time. Hence the total energy input increases with the square of the time, just like the kinetic energy imparted. If the system is 100% efficient then the total electrical energy used will be equal to the kinetic energy of the mass. |
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In what reference frame? It's not obvious to me how this works in a space drive. How does it "know" how much speed it gets per unit energy?
I guess if it's a sort of Dean drive that swims through the gravitational field of the visible universe, then that's the reference frame. It's still weird!