Recent content by Lord Dark

I used light coal instead of powder. Am lighting it using a candle wick on top of it .. Doing that I noticed 2 things , the string make a smell and it is hard to stick the candle wick on top of the coal. Is there a solution for those 2 problems ?? If I mix the candle wick with oily perfume...

thx a lot ,, i'll try it at home :D

it is coal dust .. will it ignite with only 1 matches ?

Hi everyone ,, Am doing a project and I want to light coal with matches only ,, I have 2 Ideas only , mix coal with sulfur or mix it with petroleum fuel .. I want to know will it light using any of those methods ?? with only matches ? Is it safe ? and will there be any smell out of it ...

hey guys ,, how are you all ?? guys , I've got the following problem , Air enters a gas-fired furnace at 20deg at a mass flow rate of 0.2kg/s and is burned with an air-fuel ratio by folume of 12. the gases leave the furnace at 350deg. A run-around coil system is installed to recover some of...

OK guys ,, I solved all of them except (i) & (j) ,, how can I get the starting current of the armature ?

Questions about shunt motor Homework Statement Good evening everyone, I've got the following question : Homework Equations The Attempt at a Solution Lets see,, I solved until part (e) and I didn't understand the rest. My questions are : (d) , does it mean P =...

aha, got it ... Really it's very easy ,, I feel stupid :shy: Thanks very much guys

Homework Statement Good evening everyone,, I have the following problem: The Attempt at a Solution disregarding the digit ,, he's giving me P(x) and want P(A) but A is a matrix ,, should I get the determinant of A then apply it in the equation ?? or it has some idea I need to know ??

actually , the experiment was to measure the period that permanganate become yellow with different volumes of distilled water, potassium permanganate and oxalate acid. and we got the time then get their invert so we get the rate ,, it's simple but the problem is getting the period right ~.~

Homework Statement Hi guys, Girls :smile: Today we've done an experiment to determine the order of reaction of : KMnO4 & Oxalic acid ,, I've got the following results : I think there is something wrong with the rates because when I want to get the order of reaction of Oxalic acid I...

Why what ? it's not a circle ?? ,, if yes here's why : the equation x^2 + y^2 + 4x + 8y + 25 =0 >> (x^2+4x+...)+(y^2+8y+...) = -25 [complete the square for both of them] >> (x+2)^2+(y+4)^2 = -25+4+16 [add on both sides 4 & 16 to be able to complete the square] >>(x+2)^2+(y+4)^2= -5 [ you get...

I know they are not the same thing ,, I red in the book that the reactant or real power depends on them ...

no problem :biggrin:

No it's not a circle ,, Put "x^2 + y^2 + 4x + 8y + 25 =0 " in circle equation : (x+2)^2+(y+4)^2=-20 ,, the radius is minus so it's not a circle :smile: