Not going to on9 or update...

My exam already near...
so..
i want to get ready by studying...
it is 20+ days from today..
sorry~!!
after exam..
i will have much time
yeah~!!

(Q&A) My transformer size?

Q=
Not looking for questions just answers from people who know there stuff
40 condos, spread over 30,000 sq ft.
(15) 12,000 BTU AC
(45) 9,000 BTU AC
(40) INSTANT HOT WATER HEATERS
(20) STACKED WASHER DRYER
(360) LIGHT FIXTURES SINGLE BUlBS
(1) 1500 SQ FT POOL WITH PUMP AND ACC
(15) Stacked washer dryers
(40) FRIDGES full size.

Plus about 800 plugs for random small items

A=
(15) 12,000 BTU AC (15) * 15A = 225A (steady)
(45) 9,000 BTU AC (45) * 12A = 540A (steady)
(40) INSTANT HOT WATER HEATERS (40) * 100A (peak) = 200A @ estimated useage factor at 5%
(20) STACKED WASHER DRYER (20) * 30A (peak) = 30A @euf 5%
(360) LIGHT FIXTURES SINGLE BUlBS (360) * 0.2 = 36A @50% euf using alot of CFL bulbs
(1) 1500 SQ FT POOL WITH PUMP AND ACC (1)@ 5 HP = 30A * 0.1euf = 3A
(15) Stacked washer dryers (15) * 30A (peak) = 23A @euf 5%
(40) FRIDGES full size. (40) * 0.25HP = 62.5A * 0.25euf = 16A

total: 1073A ~= 1100A @120V = 132 kVA.

You can probably get away with anything between 125 and 150 kVA, or go 'safe' and get something closer to 200 kVA.

Edit: oops, I forgot the plugs. Better stick with 200 kVA.

(Q&A) What are the names of these compounds? They are: S2Cl2 and Hg2Cl2.?

Q=
What are the names of these compounds? They are: S2Cl2 and Hg2Cl2.?

A=
S2Cl2 = disulfur dichloride, Cl-S-S-Cl

Hg2Cl2 = mercury (I) chloride

The mercury (I) cation is Hg2^2+. It is sort of a diatomic ion. In the +1 oxidation state there is no single Hg. In other words, HgCl does not exist. HgCl2 does exist, except in this case, mercury is in the +2 oxidation state.

The only thing you have to remember is that there are no single mercury (I) ions, mercury (I) exists as Hg2^2+.

========= Follow up =========

I don't think Hg2Cl2 will be very ionic, what with an electronegativity difference of 1.16. That translates to a percent ionic character of 28.6 for the Hg-Cl bond.

Hg2Cl2 would NOT be named mercury chloride. Mercury requires a Roman numeral in the stock system.

Or you could name Hg2Cl2 as mercurous chloride.

(Q&A) The rational function is G(x)=7x^2-6x-1/x^2-1. As x approaches -infinity, what is G(x)?

Q: The rational function is G(x)=7x^2-6x-1/x^2-1. As x approaches -infinity, what is G(x)?

A: [7x^2 - 6x - 1] /(x^2-1)

=(7x+1)(x-1)/(x+1)(x-1)

=(7x+1)/(x+1)

lim x--->∞ (7x+1)/(x+1) = ∞/∞, since it is indeterminate form apply

L'Hopital's rule

lim x --->∞ derivative of (7x+1) / derivative of (x+1) = 7/1 = 7

(Q&A) This stopping distance D of a car after the brakes are applied varies directly as the sq of the speed R.?

Q: If a car traveling 40mph can stop in 90ft, now many feet will it take the same car to stop when it is trsveling 70mph?

A: The car increases the speed by (70/40) times. Which means the distance will increase by (70/40)^2 times

so the answer is (70/40)^2 * 90 = 275.625ft

Recently (3 days before)

There was one time,
my father lost when on our way go to his friend's wedding..
so, my mother suggest him to buy GPS gadget or GPS PDA Phone...
that time, i have the HTC P330 GPS PDA phone.. (figure 1.1)
but they have to bring me too if they to use my GPS...

(figure 1.1)

unfortunately,

my father's pda does not have gps antenna..
fortunately,
there was this thing... (figure 1.2)

(figure 1.2)
AD-750 Bluetooth GPS receiver

My pda without phone (figure 1.3) i give my friend to be borrowed...
he keep asking me to borrow it to him...
so, i decided to give him borrow it...

(figure 1.3)
this is the current pict of my pda without phone

After a 4 months...
i ask him to give me back my pda...
because my gps pda phone has been trade with my brother sony ericsson phone..
and i wanna try the gps thingy (figure 1.2) on my pda (figure 1.3)
then,
i saw sooo many damaged he does..
1st the stylus has been gone.. 2nd the charging socket has been broken (figure 1.4).. this because he tried to plug in this socket to pda until broken.. 3rd the socket (the place to charge it)(under the pda) also broken.. so, i can't connect it to my computer.. my computer said "unknown device" even i tried to install the microsoft active sync... so, i can't use the gps thing cause of the software can't be installed on my pda....

(figure 1.4)
not clear..

soooooo sad T-T...
i was no angry with him...
just forget what happen..
i don't want this thing break my friendships...

i did learn something...
don't ever give your precious things to your friends especially the friend with little brothers or sisters...

Prison Break - 3 Seasons In 3 Minutes !

sooo fast~!

if you watch prison break, you will find it funny...

(Q&A) Torque question...

Q:-
a uniform meter stick supported at the 30-cm. mark is an equilibrium when an 1-kg rock is suspended at the 0-cm. compare the mass of the meter stick to the rock.

A:-
balance of torqs is m1*a1 +m2*a2 = m3*a3, where m1=1kg rock, a1=30cm is arm of the rock, m2=p*a1 is mass of the shorter end of the stick, p=M/100 is linear density of the stick, M is mass of the stick, a2=a1/2 is center of mass of shorter end of the stick, m3=p*(100 –a1) is mass of longer end of the stick, a3=(100 –a1)/2 is center of mass of longer end of the stick;
thus 1*30 +p*30*15 = p*70*35, hence p=30/2000, hence M=1.5 kg;

(Q&A) Electric Potential Energy?

Q:-
Part A:

A charge of +2.90 × 10^-4 C is fixed at the origin of a coordinate system. A charge of +8.35 × 10^-6 C is placed on a raisin of mass 2.65 g. The raisin is then brought from far away to a point 72.0 cm from the origin. What is the electric potential energy of the system?

Part B:

Suppose that the raisin is released from rest from its position at 72.0 cm from the origin. If no other forces act on the raisin, what will its final kinetic energy be?

A:-
A. PE = kq1q2/r = 30.227 J
B. Energy is conserved. KE = PE

(Q&A) Gr. 11 - Questions about electronegativity, combustion?

Q:-
1. Based on general electronegativity trends, which bond is more polar? B-Cl or N-Cl?

2. Write the balanced equation for the complete combustion of cyclopropane.

Is it something like this?
C3H6 + O2 -->
How do I know what it will yield?

A:-
1. Electronegativity values (approximate):
B: 2.0
N: 3.0
Cl: 3.1

The B-Cl bond is more polar.

2. Yes, the reactants are C3H6 and O2. The products of complete combustion of a hydrocarbon are always CO2 and H2O, so write the unbalanced equation,

C3H6(g) + O2(g) -----> CO2(g) + H2O(g)

and then balance it.

A american politian

There was a one politician at one country of United State. He go to village to search more supporters. He doesn't know their language. He was making his speech that was very hot topics. He also made his promise. The people hearing his speech was "cheering" and said: "Hoya...Hoya.." repeatedly

Felling like his speech was getting more attention, he was more motivated.

After his speech ends. The politian was take a visit to the place chaperoned by the head village. The head village said, "Sir, cows at this place likes to poo everywhere. So, you have to be careful not to step on their "hoya".

"Hoya....?" said the volunteer and remembering the "cheering" of the citizen that hearing his speech.

Dead City

There a man named "A" was on his way across a forest. He saw a soldier lost..
"Can you show me the way to town?" asked the soldier.
"Can" replied "A" and show a way..
After a while.. The soldier saw cemetery and not a town..

"*&%# that person" said the soldier.. He run backward and caught "A". The soldier was angry.. He strangle A's neck and smack his head till blood come out..

"You're a liar. I asked you town but you give me a way to cemetery." He tie A and drag him using a horse..

"Soldier! That A is a King, why you drag him like that?" asked people who saw this.

"He showed me a wrong way. I want to town but he showed me a way to cemetery." said the soldier.

"That "town" is a place that are many citizens and it is increasing. Citizen at the cemetery increasing day to day, but the town you want to go is getting lesser if a person died." said A

"Cemetery is place is a town that is getting bigger?" added A

The soldier was surprised, he wipe his eye. And the person that he is being tortured was really a King.. Without a haste, he prostate to A and ask for A's apologies. A was not angry. But he was happy. Because... ^^

yeah!!!

My brother's comp can't be used... this is because of the virus...
I tried to install back the Windows (OS)...
but the installation failed coz "Data Cyclic Error"...
so.. i used my father laptops...
i took out the hard disk and put it to external...
i used my father laptops to format it...
when i tried to install the windows to the hard disk..
there was an error...
it is becoz my father .NET framework is different...
my father laptops were wide screen and Sony Vista it is exclusive for Sony laptop only...

it is really need to repaired ASAP...
becoz there is a work have to be done..
so..
my brother send to summit to be repaired...
i can't follow him...
i have to study..
haha^^

then,
my father gave me back my laptop...
yay~! =D

wah~!
now i know...
there advantage of broken computer...
my brother's comp now is SP3...
bit dizzy of new settings...

now..
i can on9...
with my wonderful, bombastic, spastic, cool, nice, fast, cute laptops =D...
but...
i don think wanna on9 now..
exam near alreadi...

aishh..
i hate to hear the "exam" and "study" words...