MHB 639.7.6.97 write an equivalent polar equation

  • Thread starter Thread starter karush
  • Start date Start date
  • Tags Tags
    Equivalent Polar
AI Thread Summary
The discussion focuses on converting the Cartesian equation x² + (y - 1)² = 1 into its equivalent polar form. Initially, the equation is expanded and rearranged to x² + y² = 2y. Substituting r² for x² + y² and r cos(θ) for y leads to the equation r² = 2r sin(θ). The final polar equation is presented as r = 2 sin(θ). The conversion process highlights the importance of correctly substituting variables in polar coordinates.
karush
Gold Member
MHB
Messages
3,240
Reaction score
5
$\textrm{write an equivalent polar equation}$
\begin{align*}\displaystyle
x^2+(y-1)^2&=1
\end{align*}
$\textrm{expand and rearrange}$
$$x^2+y^2=2y$$
$\textrm{substitute $r^2$ for $x^2+y^2$
and $r \cos(\theta)$ for $y$}$
$\textrm{then}$
$$r^2=2r\cos(\theta)$$
$\textrm{or}$
$$r=2 \cos(\theta)$$

kinda maybe
 
Last edited:
Mathematics news on Phys.org
Looks good to me. (Yes)

edit: On second thought...there is an issue...$2y=2r\sin(\theta)$...:D
 
got it.

should of seen that:cool:

- - - Updated - - -

$\textrm{write an equivalent polar equation}$
\begin{align*}\displaystyle
x^2+(y-1)^2&=1
\end{align*}
$\textrm{expand and rearrange}$
$$x^2+y^2=2y$$
$\textrm{substitute $r^2$ for $x^2+y^2$
and $r \cos(\theta)$ for $y$}$
$\textrm{then}$
$$r^2=2r\sin(\theta)$$
$\textrm{or}$
$$r=2 \sin(\theta)$$
 
Suppose ,instead of the usual x,y coordinate system with an I basis vector along the x -axis and a corresponding j basis vector along the y-axis we instead have a different pair of basis vectors ,call them e and f along their respective axes. I have seen that this is an important subject in maths My question is what physical applications does such a model apply to? I am asking here because I have devoted quite a lot of time in the past to understanding convectors and the dual...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...

Similar threads

Replies
3
Views
2K
Replies
2
Views
11K
Replies
1
Views
11K
Replies
2
Views
6K
Replies
1
Views
11K
Replies
2
Views
5K
Back
Top