Convert Definition and 571 Threads

So I was working on solving $(\frac{1}{4900})^{100}$, and I figured the only way to do this neatly is through modular arithmetic. I found that $4900 \equiv 84 \ (\text {mod 112})$, so I concluded $$\frac{1^{100}}{84^{10}\times84^{10} \ (\text{mod 112})}$$ Which should equal...

Hi. At first,I am sorry that my English is so bad. I've just installed Healpix on cxx(c++), and I'm starting to leraning. then I made txt file containing binary data(RING pixel and corresponding to data like temperture),and I want to make Healpix RING map of the data. but I don't know which...

I have several equations and need to convert it into Python. The problem is that I tried to plot a graph according to the equation. However, the graph that I get is not the same as the original one. In the paper, the equation of error probability for MIM attack is given by: First Image Second...

If I have a limit of a series then how can I convert it into integral. I know to convert a sum into an integral there must be Δx multiplied to each term and this must go zero. Can you please explain me the conversion of limit of series (normal series with no Δx) into an integral. Thank you.

The equation is: r= 1/1+sin(theta) I know the answer is supposed to be: x^2+y^2=(1-y)^2 I can't figure out the steps to get to the answer.

My professor gave us a study guide with the solutions: The equation is: sec(theta)=2 I am supposed to convert it to a rectangular equation. I know the answer is going to be y^2-3(x)^2=0 I don't know how to get to the answer he gave us.

I'm looking for a little help here. I'm just a relatively regular Joe here though, so any complicated formulas are likely to go right over my head. What I'm trying to do is use the Ruby programming language to convert rise and run (slope) to degrees. See the attached screenshot... Assume x...

I am still learning general relativity (GR). I know we can find the path of a test particle by solving geodesic equations. I am wondering if it is possible to derive/convert metric tensor to gravity, under weak approximation, and vice versa. Thanks!

Hello, We just finished up midterms and I actually did well--got an A. However, somehow between the midterm (class before last) and last class we jumped to creating a circuit with a diode. I am pretty lost. 1. Homework Statement Homework Equations Voltage / Current = ResistanceThe Attempt...

So we're learning to plot polar equations, which easy enough. But I got a question in the homework that wasn't covered in class: Convert r=7cos(theta) into a rectangular equation. Use x and y values. I know how to convert when it's x=r*cos(theta) or y=r*sin(theta) and r and theta is given. But...

x^2+y^2=4 I have so far: (r^2)cos^(theta)+(r^2)sin(theta)=4 Idk what I'm supposed to do from here

Convert the equation to polar form 8x=8y I thought it would be 8*r*cos(theta)=8*r*sin(theta) Said it was incorrect then I thought I needed to divide by 8 to remove it, giving me: r*cos(theta)=r*sin(theta) But that was also incorrect and now I am stuck

Homework Statement Convert the vector given in spherical coordinates to cylindrical coordinates: \vec{F}(r,\theta,\varphi) = \frac{F_{0}}{arsin\theta}\bigg{[}(a^2 + arsin\theta cos\varphi)(sin\theta \hat{r} + cos\theta \hat{\theta}) - (a^2 + arsin\theta sin\varphi - r^2 sin^2\theta)...

Homework Statement Replace the polar equation with an equivalent Cartesian equation. ##r^2 = 26r cos θ - 6r sin θ - 9## a)##(x - 13)^2 + (y + 3)^2 = 9## b)##(x + 26)^2 + (y - 6)^2 = 9## c)##26x - 6y = 9## d)##(x - 13)^2 + (y + 3)^2 = 169## Homework Equations ##x= r cos \theta## ##y= r sin...

Homework Statement Replace the Cartesian equation with an equivalent polar equation. ##x^2 + (y - 18)^2 = 324## a)##r = 36 sin θ## b)##r^2 = 36 cos θ## c)##r = 18 sin θ## d)##r = 36 cos θ## Homework Equations ##x= r cos \theta ## ##y= r sin \theta ## ##x^2 + y^2 = r^2 ## The Attempt at a...

Homework Statement Convert a number concentration of 15 X 10^12 molecule/cm3 into volume mixing ratio at: a) 1 atm pressure, and 20 C temperature. b) 500 mbar pressure, and 253 K temperature. Using the Ideal Gas Law, calculate: a) Loshmidt’s number (# of molecules/cm3 of air, at standard...

Hey! :o We have the sequence $$0, \ 2 , \ -6, \ 12, \ -20, \ \ldots$$ Its recursive definition is \begin{align*}&a_1=0 \\ &a_{n+1}=(-1)^{n+1}\cdot (a_n+2\cdot n)\end{align*} or not? How can we convert that in the explicit form? (Wondering)

i have a column in a dataframe that contains values in the form or tuples (example: ('A',) ) and I want to convert these values to string format so that ('A',) becomes 'A' How do I do this in python for a dataframe? Thanks.

Homework Statement There's an example problem in Astrophysics textbook that involves calculating T (time elapsed since last reference date as a decimal) the date is July 30, 2005 at noon. and the reference date is Jan 01, 2000 at noon. the calendar starts on Jan 01, 2000 so that it is just...

Hi, I know that Python supports parallel programming. I think it can be used in my case but not sure how. Basically I have this for loop out = [] for value in vec: out.append(func(value)) where func is some function that takes value as an argument. The different values in vec are...

Homework Statement I would like to convert this R code into matlab. This code perform a calculation of beta coefficient based on Detrended cross correlation analysis. Homework Equations require(tseries) require(fracdiff) require(matrixStats)DCCA_beta_avg<-function(y,x,smin,smax,step){...

I have a dBW value and dBW I understand to normally be given as representing a RMS Power (however this is not specificically ever stated and I am told its just assumed?) from dBW to Watts = 10^(dBW/10) This then gives RMS power in Watts At what point do I convert this from a RMS to a peak...

Hello, Obviously using a piston, you convert linear movement to circular. Or using a turbine. Other methods/mechanisms?

What am I doing wrong here in my attachment?

I have doubt. Is it possible to convert DC motor to Stepper ? If yes then what is the procedure ?

I have downloaded some videos of the format .file They will play fine in windows media player and vlc, but i don't think they work on android Is there any way to convert them to mp4 or any other video formats

Hi, in the link https://math.stackexchange.com/questions/1465629/numerically-solving-a-non-linear-pde-by-an-ode-on-the-fourier-coefficients there is a nice example related to spectral theorem using Fourier series. Also in the link...

Homework Statement [/B] (1)A sphere of radius 0.500 m, temperature 27.0 C, and emissivity 0.850 is located in an environment of temperature 77.0 C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere’s net rate of energy exchange? (2)A cylindrical...

Okay, so I'm working with a rather frustrating problem with a calculus equation. I'm trying to solve a calculus equation which I conceptualized from existing methods involving complex number fractal equations. I'm very familiar with pre-calculus, while being self-taught in portions of calculus...

Hi, I need to convert a value of 12*10-16 m7 N-3 y-1 to the units of kPa-3 m2 s-1. Can anyone help me? where: m = meters, N = Newton, y = year, s = seconds. Thanks!

How much time does it take to convert one form of energy to another. Say ball dropped from a height 'H' its PE convert to KE. Can it be be defined in a time frame?

Hi everyone, so I have equation, let's say X and I want to convert it to SI units. Now X is in 1/(ft*°F) and I need 1/(m*°C). Ok, so I simply convert ft to m= 0.3048, but what to do about °F? 1°F is -17.2°C which will not work. Any suggestions? Thanks, Miroslav

I'm working on a convolutional neural network project that classifies histopathological images of breast tumors. All my code is in python. Part of the image preprocessing involves appearance normalisation to account for the variation in histological staining. The only code for the preprocessing...

Hi, I have the following complex ODE: aY'' + ibY' = 0 and thought that it could be written as: [a, ib; -1, 1] Then the determinant of this matrix would give the form a + ib = 0 Is this correct and logically sound? Thanks!

Hi! I'm completely new to this website, and I have no background. I'm just a curious kid who googles stuff for the fun of it, and I've just had this burning question for a while now. I watched this interview with Michio Kaku on YouTube, and he discussed how we shouldn't exist. Anti-matter and...

Homework Statement How much energy is created when 0,0188828901 atomic mass is converted into energy (Joule) Homework Equations E = m * c^2 speed of light = 299792458 1 atomic mass unit = 1.660539040e-27 kg 1 atomic mass unit = 931,494028 MeV 1 eV = 1,6021766208e-19 Joule The Attempt at a...

Homework Statement "Given that ##FS f(x)=\frac{L^2}{3}+(\frac{2L}{\pi})^2⋅\sum_{n=1}^\infty \frac{(-1)^n}{n^2}cos(\frac{n\pi}{L}x)##, prove that ##\sum_{n=1}^\infty \frac{(-1)^n}{n^2}=\frac{\pi^2}{12}## and ##\sum_{n=1}^\infty \frac{1}{n^2}=\frac{\pi^2}{6}##. Homework Equations ##FS f(x) =...

Hi, I have the following ODE: aY'' + bY' + c = 0 I would like to convert it to a matrix, so to evaluate its eigenvalues and eigenvectors. I have done so for phase.plane system before, however there were two ODEs there. In this case, there is only one, so how does this look like in a matrix...

how does electric motor convert electrical energy to mechanical energy. Hello I do not understand the following electric power is P = V * I electric motors operate on the principle of repulsion and attraction of magnetism. What confuses me where that power ends because as far as I know, the...

[FONT=Arial] I have to read house plan blueprints and convert the measurements on the plan to usable feet and inches to do layouts in feet and inches.

How do you convert this to Spherical Components? Spherical Convention = (radial, azimuthal, polar) ##\vec r = |\vec r| * \cos{(\theta)} * \sin{(\phi)} * \hat x +|\vec r| * \sin{(\theta)} * \sin{(\phi)} * \hat y +|\vec r| * \cos{(\phi)} * \hat z## Is this correct? ##\vec r =\sqrt{(x^2 + y^2 +...

<Moderator's note: Moved from a technical forum and thus no template.> Hello Forum, This post is a spin-off from this post: https://www.physicsforums.com/threads/how-much-would-time-pass-between-watching-the-sun-set.925257/#post-5840279 If I have an X and Y point on a grid that represents...

1. Convert 6.7 km/hr/sec to m/sec^2. I was given the initial value and the units (kilometers/hour/seconds) to (meters/seconds squared). 2. image for clarification 3. The correct answer is 1.89 m/s^2. I watched a video on how to do it (and followed the video to get the following), but I don't...

Homework Statement I have some data from measuring EC in solutions and I don't know how to convert EC to pH Homework EquationsThe Attempt at a Solution I use Arduino for programing. Values of ADC of EC that I collect from microcontroller are 80 ( for EC : 0.2mS/cm ) , 90 ( for EC ...

Homework Statement Convert x3 -y3 = 6xy into polar equation. Homework Equations x=rcosθ y=rsinθ x2 +y2 = r2 The Attempt at a Solution r3cos3θ - r3sin3θ = 6r2sinθcosθ r(cos2θ/sinθ - sin2θ/cosθ) = 6 r(cosθcotθ -sinθtanθ) =6 r = 6/(cosθcotθ - sinθtanθ)

Hello, Can anyone explain the procedure to convert mg/s to SCCM? I'm working with an Alicat Mass Flow Controller, which regulates Argon (Ar) mass flow from 1 to 6 mg/s at 27o C or 300 K (room temperature). For documentation purpose, I need mass flow in terms of mg/s, as well as, SCCM. Thank...

Hi Guys, Can Some one Help me to Figure Out how can i Convert Voice Signal from 3.5mm Jack to Voltage. Though the voice signal has low signal strength can i boost it using amplifer and to get output in Voltage what is the Process i am not figuring out the perfect way. Sugest me your Option...

Homework Statement Convert the nitrate standard of 50 ppm to its nitrogen content Homework Equations Since NO3 contains one nitrogen, molar mass 14.01, in a total molar mass of 14.01 + (3 *16.00) = 62.01, the maximum concentration permitted expressed as nitrate ion itself is (62.01/14.01) *10=...

I had some precipitate samples analyzed for XRD and the operator sent me the results in .txt format containing the 2θ and intensity data. I want to plug the data to QualX software but apparently it cannot read data in that format. Is there any way to convert the data to compatible formats (e.g...

hello i'm working on a project that consist on reading the light of LEDs on PCB to determine the color code (R,G,B) and light intensity but the sensor gives me values in LUX which is the illuminance and i need to convert them to Candela I found this formula in wikipedia but i didn't understand...