15 Jun '10 17:57>
One of the biggest mis-understandings in my own journey into physics was the post about acceleration, I was unaware that undergoing acceleration by a constant power source would have some limit, that is to say, the acceleration would get less and less as time goes by.
My question that never got answered is this:
How does an object going at some non-relativistic velocity know it is at some velocity and the power supply giving said acceleration, say a 200 megawatt source powering the Vasimir rocket, we calculated it would have around 0.04 G's or thereabouts, thus making a trip to Mars in around 40 days (accel halfway, then decel)
So the gist of the constant power source is the accel is not linear, that is to say the G force when it starts out may be 0.04 G's but when it gets time to reverse the motors, it may have gone down to some lesser #, say 0.03 G's or something.
I still have problems knowing how the spacecraft knows it is not a relative zero velocity vs what the velocity is down the line. Any explanation for that?
My question that never got answered is this:
How does an object going at some non-relativistic velocity know it is at some velocity and the power supply giving said acceleration, say a 200 megawatt source powering the Vasimir rocket, we calculated it would have around 0.04 G's or thereabouts, thus making a trip to Mars in around 40 days (accel halfway, then decel)
So the gist of the constant power source is the accel is not linear, that is to say the G force when it starts out may be 0.04 G's but when it gets time to reverse the motors, it may have gone down to some lesser #, say 0.03 G's or something.
I still have problems knowing how the spacecraft knows it is not a relative zero velocity vs what the velocity is down the line. Any explanation for that?