Law of Hess and heats of dissolution in acid.^б-в Х, КХ

In 298.15 º K are set following the dissolution enthalpy of these compounds in HCl:

B₂O₃.3CaO           -344.86 kJ/mol,

B₂O₃.2CaO           -210.40 kJ/mol,

B₂O₃.CaO  ...

Hi I want to solve the following equation. For this I have written the following program. But Maple showing error.

eq := diff(x(t), `$`(t, 2))+326.1*(diff(x(t), `$`(t, 1)))+3190*(diff(x(t), `$`(t, 1)))^2-37500*sqrt(x(t)*(0.165e-2-x(t)))+2.825

ICs := x(0), Dx(0)-0

sol := dsolve({ICs, eq}, {x(t)}, type = numeric);

but it is showing 

Error, (in dsolve/numeric/process_input) system must be entered as a set/list of expressions/equations

eq := {-2*b[2]*B+b[3]*J+b[5]*J-lambda[2]*b[2] = 0, 
          -2*b[5]*B+b[2]*J+b[4]*J-lambda[2]*b[5] = 0, 
          -lambda[2]*b[3]-2*b[3]*B+b[4]*J+b[2]*J = 0, 
          -lambda[2]*b[4]+b[3]*J-2*b[4]*B+b[5]*J = 0, 
           abs(b[2])^2+abs(b[3])^2+abs(b[4])^2+abs(b[5])^2-1 = 0}

 v := {lambda[2], seq(b[i], i = 2 .. 5)}

 ans:=solve(eq,v)

the result show:

          ans:=

Hello all,

In reference to Acer's workaround for the operator form of the optimization package, I'm having difficulty applying the method to an optimization problem with 7 variables. I'm hoping you can help me see what I'm doing wrong. This is what I've got coded, where EIG is a fairly long, complex procedure that outputs a float value:

> objf := proc (V::Vector)

find the inverse of unction f(x)=(4x)/(x-2).

If I use

with(plots):
plotsetup('bmp', 'plotoutput' = "F://try1.bmp");
pointplot([seq([i,i^2],i=1..100)],legend="F[u]");

every thing is fine but if I change this to

pointplot([seq([i,i^2],i=1..100)],legend=typeset(F[u]));

Maple evaluates for ever!

The above works fine for inline display.

Is there a way round this apart from exporting from inline?

Hello,

there is a problem puzzling me, plot(tan(x),view=[-10..10,-10..10],discont=true) can plot tan(x) correctly, but when using smartplot(tan(x)),it yields an unexpected picture.

Is there any way to plot tan(x) correctly only using smartplot?

Thank you.

This problem has been doing my head in for a long time now! I'd be very grateful if anyone can help.

I need to plot this function f(r,theta,phi)=exp[-(r-r₀)²/2²]. where r₀=4 But first, if this is in spherical coordinates, where's the theta and phi in this expression? Why are they missing?

I believe the code required to plot this is something like: sphericalplot(f(r),r=0..5,theta=0..2Pi,phi=0..2Pi), but...

Why I can't rating applications in Application Centre ?

Is it possible to assign certain properties to certain variables in Maple, and have them obey those properties?

In other words, I want to work in complex numbers. I want z to be complex and to obey the rules of complex numbers. How can I declare z element of Complex and then Maple won't do complex illegal operations (or it will do them correctly). Sort of like "I" works according to the rules of sqrt(-1). Except that I is built in.

Another example would be to...

Dear all,

I am running Maple 11 on my PC. I have Windows 7 (64 bit installed), use Eclipse SDK for Java development.

I have made some mathematical calculations in Maple 11, now I want to integrate them to Java using OpenMaple API.

I viewed help, maple soft and maple primes resources ...... I found test.java example in Maple 11 directory.

I can't add classpath to OpenMaple libraries in Java.

I have Java SDK 6 installed in...

I'm currently using Maple to plot a 2-D (x,y) function F(I) that, at each point, is a function of a nasty integral, I(x,y,t)dt between -infinity and some constant. Maple does a good job of plotting the data and the resulting plot looks fine. The trouble is that when I ask Maple to just evaluate F for a single (x,y) rather than over the full range of (x,y) it tells me that it is not analytically tractable and it cannot produce a result.

If this is true, then how on EARTH...

It's possible for a user to set many defaults within a Maple session. One feature I do not see how to customize is the "point probe" tool. In earlier versions of Maple there was only one mode, and the coordinates of the cursor within a 2D plot were displayed in the context bar of the Maple window.

Now, there are several different modes for viewing coordinates within a plot. By default, the point probe shows nothing about the current location of the cursor. To change the point probe for one plot, right click and select Probe Info from the context menu, then choose one of "Cursor position", "Nearest datum", or "Nearest point on the line".

This has to be repeated for each plot.

Is there a way to set the default?

This works only when the plot "Manipulator" is set to "Point Probe". If it's set to Pan or Scale, this needs to be changed via the icons on the plot toolbar or through the Manipulator entry on the context menu.

Along the same lines, is there a way to set the default Manipulator to Pan or Scale?

Relevant help pages are worksheet,plotinterface,pointprobe and worksheet,plotinterface,manipulatormenu

If not, these would be nice features to have added for Maple 15.

I need to know if maple has any function that would allow me to explore the variables in an expression.

I am writing a program to find the coefficients of the second order derivative of all the variables in the expression and i have no way find out all the variables in the expression before hand and hence need to do it runtime.

fsolveLagrangeNumeri.mw

Dear Colleagues
As you can see from the worksheet with the command solve achieving results. I would like to enter initial values for b, a and R0. When trying to use fsolve for this purpose
I get the following result:
Error, (in fsolve/setrange) R0 = 10 is an invalid range

How to achieve convergence using fsolve?
any help?
Gracias