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Jun
18
answered 3D Cartesian Transformation
Jun
17
comment Convert to displacement time signal (from accelerometer) using velocity time signal or displacement frequency signal
What were you expecting and what did you see?
Jun
17
comment 3D Cartesian Transformation
you are correct about any rigid motion being a rotation and translation about an axis. This is called a screw motion. If no one answers I will try to answer this question tomorrow.
Jun
16
comment 3D Cartesian Transformation
Does the transformation involve a translation as well as a rotation? If it does, you will have to use a homogeneous transformation not just a rotation.
Jun
16
comment This matrix is an attractor?
For positive values of $\gamma$, $A$ is not an attractor. By attractor I assume that you mean that the system $\dot{x} = Ax$ system is stable.
Jun
16
comment Could someone help me to prove that this symmetric matrix is definite positive?
How does this question differ from your last question? It appears that they are the same.
Jun
15
answered How to convert differential equations to Maxwell's equations?
Jun
14
comment How to convert differential equations to Maxwell's equations?
All geometric information is lost in the equation of an RL circuit. There would be no conceivable way to determine field equations involving Div, Grad and Curl from a lumped circuit ODE.
Jun
13
answered How to think of $\vec{u}-\vec{v}$
Jun
10
answered As inspired by a previous question, why is this derivation invalid?
Jun
9
comment As inspired by a previous question, why is this derivation invalid?
Your hunch is correct. What happens if you square both answers?
Jun
9
comment Prove that $n! < n^n $ where n >1 and is an integer , why do some people say my solution is wrong?
because $k! < (k+1)^k \nRightarrow k! < k^k$
Jun
9
answered What is the use of the Dot Product of two vectors?
Jun
7
comment Angle between different rays (3d line segments) and computing their angular relationships
Note that if these points are in 3D space, there may not be an easy or obvious way to order them by angle in a way that makes sense.
Jun
6
comment Euclidean Geometry
You can develop a counter example by construction. Consider four co-planar points arranged in a square. The perturb one of them by a displacement of dz in a direction orthogonal to the plane. Clearly , its projection takes it back to the original square which is not in the triangle defined by the other three points.
Jun
6
comment Euclidean Geometry
How do you define projection? Orthogonal or oblique projection?
Jun
6
answered Why is the line between two points called the line of the “secant”?
Jun
6
comment Determine if vectors are linearly independent
substitute $c=0$ back into (4) or (5) to show that $b=0$ and then both $b=0$ and $c=0$ into (1) or (2) to show that $a=0$. By definition they are then linearly independent.
Jun
4
answered Calculating rotation matrix of coordinate system from 2 known axis
May
23
comment Can you find the resultant force between these two vectors?
@iostream007, I get the same answer as your approach with the law of cosines. Just a different method.