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11h
answered Move a dot along a path
1d
revised Distance between two circles on a cube
added 444 characters in body
1d
answered Distance between two circles on a cube
1d
comment Regular/Right hyperbolas through three points
I thought a right hyperbola is one without a $ x y $ term with its major/minor axes being the x and y axes. To include an $x y$ coefficient will yield two independent parameter that the family of curves is going to depends on. Also I decided on the $\ldots =1$ instead of the standard homogeneous coordinates $\ldots +F = 0$ in order to have only 4 dependent quantities. Plus the OP did not include any of the stuff you mention.
2d
answered Regular/Right hyperbolas through three points
Jan
30
answered Angle vector in polar system represented by Cartesian vector
Jan
29
comment Equation of a circle whose radius and tangent is given
$y= m x$ will never be tangent to a centered circle. A tangent line will have all its points outside the circle and the origin is inside the circle while belonging to the line also. Please rephrase the question.
Jan
29
answered Relationship between factorial and derivatives
Jan
24
comment Modelling free fall with Euler
@NobleMushtak This would yield more accurate results, but it won't be Euler's method. The OP has to decide.
Jan
23
comment Moment of Inertia around z axis
First you find the center of mass from the origin and then you calculate the MMOI about the origin. lastly you use the parallel axis theorem to transfer the MMOI to the center of mass.
Jan
23
answered Rotating a 3 coordinate point
Jan
18
answered Understanding what a plane is in $\mathbb R^3$
Jan
17
comment Finding a suitable matrix to solve equation
@Peter also scalar multiples of this matrix are solutions.
Jan
17
comment Finding a suitable matrix to solve equation
Solutions to the first equation are: Try $T = \lambda \begin{vmatrix} \cos\theta & \sin\theta \\ \sin\theta & \cos\theta \end{vmatrix}$ or $T = \mu \begin{vmatrix} -\sin\theta & \cos\theta \\ \cos\theta & -\sin\theta \end{vmatrix}$
Jan
16
revised Find the eccentricity of a conic
added 342 characters in body
Jan
16
comment Find the eccentricity of a conic
@robjohn I disagree. Look at my edit, which shows the derivation of eccentricity for a conic more rigorously. Where did you get your eccentricity values from. Note also that the second equation above is equivalent to $-75 x^2 + 26 y^2 -1 =0$ which should different eccentricity not because $C$ is different but because what is considered a major and a minor radius is different (interchanged).
Jan
16
revised Find the eccentricity of a conic
added 342 characters in body
Jan
16
comment Find the eccentricity of a conic
it is not used. I just included it here for completeness. $C$ is like a size/scale parameter, and $A$, $B$ dictate the shape.
Jan
15
revised Find the eccentricity of a conic
added 189 characters in body
Jan
15
answered Find the eccentricity of a conic