See attached file and code

0. This is the differential equation I'm trying to do:

http://www.intmath.com/differential-equations/6-rc-circuits.php

https://i.imgur.com/zlVIisR.png

1. After you look at the above imgur link, could you help me with this error 

Error, (in Units:-Standard:-+) the units ``Ω`` and `1/F` have incompatible dimensions

2. Why does my solve ODE fail? 

See my code: 

test_maple.mw

So it looks like radians work.

Why does degrees fail and how do I get degrees work?

How do you guys like to access pi? Do you keep a symbol of it around in a random document to open? 

http://i.imgur.com/07o1dyH.png

http://i.imgur.com/JGObjn5.png

I tried with and without evalf. Do I need to import something? or something like with Linear Algebra? 

Here was my search strategy to find the answer:

keyboard shortcut execute worksheet on http://www.mapleprimes.com/search/?term=keyboard%20shortcut%20execute%20worksheet

only found one thing http://www.mapleprimes.com/users/erik10/answers

Googled it found 

http://www.maplesoft.com/support/help/maple/view.aspx?path=worksheet%2Freference%2Fhotwin

http://www.maplesoft.com/support/help/Maple/view.aspx?path=worksheet/expressions/executeworksheet

http://scipp.ucsc.edu/~haber/webpage/maple_cheatsheet.pdf

Don't see a keyboard shortcut. 

What is the keyboard shortcut to execute entire worksheet? Is there a name for this action of executing the whole worksheet? 

What did you search and click to find the answer? 

A := Matrix(3, 4, {(1, 1) = 1, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (2, 1) = 2, (2, 2) = 2, (2, 3) = 0, (2, 4) = 0, (3, 1) = 0, (3, 2) = 6, (3, 3) = 4, (3, 4) = 0});
print(`output redirected...`); # input placeholder
Matrix(%id = 4436610626)
RowSpace(A);
print(`output redirected...`); # input placeholder
RowSpace(Matrix(%id = 4436610626))

 Why is this failing to give the row space? I copied and pasted it from the tutorial on this and it seems to run in the tutorial but not when I copy and paste it outside the tutorial? 

tutorial http://www.maplesoft.com/support/help/maple/view.aspx?path=LinearAlgebra%2FRowSpace

See picture

http://i.imgur.com/eQtEJU4.png?1

In general what is the best way to share maple code with users on this forum ? The above copy and paste looks messy.