If I have an unit vector the derivative is an orthogonal vector (orthogonality is enough easy to demonstrate)
How I can demonstrate that the derivative of unit vector is not an unit vectors ?
If I have an unit vector the derivative is an orthogonal vector (orthogonality is enough easy to demonstrate)
How I can demonstrate that the derivative of unit vector is not an unit vectors ?
Thanks !
It can be a unit vector... Look for instance at . But it does not have to be a unit vector, look at .