Twoacross

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These are replies submitted by Twoacross

Forgot to attach demo srry!

 

Thanks

 

Demo.mw

 

 

 

 

Thanks for the help!

Thanks for the help!

Sorry about that! Heres a fixed version for everyone!

Lab6.2011.mw

 

So the questions i needed help on were 2, 3, and 6

Thanks! the parts in 6 were kinda tricky, i tried many equations but i cant seem to fit the requirements

 

Thank you!

@Twoacross 

So what ive tried doing is:

eq3:=dsolve({eq2, y(2) = 75.0},y(t))

eq4:=dsolve({eq1,y(0)=300},y(t))

Dc:=diff(eq4,t)

Dc2:=diff(eq3,t)

now with the Dc and Dc2 what ive tried doing is solving for the variable, but the d / dx as i mentioned creates some errors when i do anything with the two equations.

so taking the equation from Dc, i removed the d / dx part since its already been differentiated and put it into a new function but its the same:

eq5 := -(196352481/15625000000)*t^2+(487227/3125000)*t*300^(1/3)-(1209/2500)*300^(2/3))

eq6 := -(3627/100)*exp(-(1209/2500)*t)/exp(-1209/1250)

from there i plotted both of them to see where they would intersect to find when they will be the greatest, i tried finding the intersect point and it gave me this:

RootOf(162409*_Z^2-2015000*_Z*RootOf(_Z^3-300, index = 1)+6250000*RootOf(_Z^3-300, index = 1)^2-468750000*(exp(-(1209/2500)*t))(t)*exp(1209/1250))

Ive tried simplifying it but it wouldnt work for me. but maybe this is when the rate of change is same for the both and not when the difference is the greatest. So im kind of confused at this point, ive tried referencing back to the tutorials my instructor gave me and im still trying to figure out which direction im going.

All help is greatly appreciated!

@Twoacross 

So what ive tried doing is:

eq3:=dsolve({eq2, y(2) = 75.0},y(t))

eq4:=dsolve({eq1,y(0)=300},y(t))

Dc:=diff(eq4,t)

Dc2:=diff(eq3,t)

now with the Dc and Dc2 what ive tried doing is solving for the variable, but the d / dx as i mentioned creates some errors when i do anything with the two equations.

so taking the equation from Dc, i removed the d / dx part since its already been differentiated and put it into a new function but its the same:

eq5 := -(196352481/15625000000)*t^2+(487227/3125000)*t*300^(1/3)-(1209/2500)*300^(2/3))

eq6 := -(3627/100)*exp(-(1209/2500)*t)/exp(-1209/1250)

from there i plotted both of them to see where they would intersect to find when they will be the greatest, i tried finding the intersect point and it gave me this:

RootOf(162409*_Z^2-2015000*_Z*RootOf(_Z^3-300, index = 1)+6250000*RootOf(_Z^3-300, index = 1)^2-468750000*(exp(-(1209/2500)*t))(t)*exp(1209/1250))

Ive tried simplifying it but it wouldnt work for me. but maybe this is when the rate of change is same for the both and not when the difference is the greatest. So im kind of confused at this point, ive tried referencing back to the tutorials my instructor gave me and im still trying to figure out which direction im going.

All help is greatly appreciated!

For some reason when i found the derivative of my V(t) functions, that d / dt is preventing me from doing any further calculations.

Any reasons as to why its doing this?

For some reason when i found the derivative of my V(t) functions, that d / dt is preventing me from doing any further calculations.

Any reasons as to why its doing this?

Thanks Oliver! Understood where i went wrong!

=D

Thanks Oliver! Understood where i went wrong!

=D

i used y(t) to save me some confusion

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