Homework Help Thread--SPLIT

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Ammer · #91 Post by **Ammer** » Sat Mar 17, 2007 6:58 pm

Ixist wrote:
Ammer wrote:I'm writing a paper on the United Nations and if its relevant in insuring peace and security. The problem I'm having is actually coming up with an opening sentence or sentences for the essay. I have the information for points but I can't for the life of me start this essay with a general look on the topic.

Any thoughts?

Maybe talk a bit about how it was created after WWII to ensure peace, but without the constraintns of the League of Nations. Then say something like "However, does the United Nations live up to it's name? Is it actually fulfill it's original duty and ensure global peace?" Then you could go into your whole schpiel about whether it does or doesn't. It also makes it easy to answer the question at the end by saying "Yes, it does live up to it's purpose" or "no, it does not live up to it's purpose".

I did write a few paragaphs on how it was created and I talked about the League of Nations as well.

But I think I need something more general, becuase the creation of the UN can actually be used in my essay as more than an introduction.

Edit:

Actually, I think you're onto something. Thanks Ixist!

FrankieG · #92 Post by **FrankieG** » Tue Mar 27, 2007 10:24 pm

Anyone here good at Macro Economics? I have some quick questions. If government spending falls, what happens to prices, output, and employment? Also, am I right in thinking that if oil prices increase, only the SRAS (Short-Run Aggregate Supply) curve would be affected, and it would shift to the left? And finally, if oil prices increased and it shifted that curve to the left..am I right in thinking prices would increase while output and employment would decrease? (Whew, that was a lot)

Zilary · #93 Post by **Zilary** » Tue Mar 27, 2007 11:07 pm

FrankieG wrote:Anyone here good at Macro Economics? I have some quick questions. If government spending falls, what happens to prices, output, and employment? Also, am I right in thinking that if oil prices increase, only the SRAS (Short-Run Aggregate Supply) curve would be affected, and it would shift to the left? And finally, if oil prices increased and it shifted that curve to the left..am I right in thinking prices would increase while output and employment would decrease? (Whew, that was a lot)

Eurk. I took that last semester. Let's see what I remember...

If goverment spending falls, prices increase, output decrease, and employment decrease because goverment spends on areas (public works, etc) that puts money into the economy.

If oil prices increase, the SRAS would shift...to the LEFT.
Because (here's my sad paint diagram)

Thus, output will decrease and employment will decrease

(I'm like 90% sure on that...anyone feel free to correct me if I'm wrong)

M. Bison · #94 Post by **M. Bison** » Wed Mar 28, 2007 6:55 am

The thing with Macroeconomics is different economists see things differently - so very often - your predictions depend on which economists' model you used.

Assuming a classical AS-AD model, Zilary is mostly correct.

If government spending falls - all else equal - output will fall. When the government cuts spending, the demand for some goods and services (take, for example, defense contractors) falls, causing the aggregate (overall) demand to decrease. This can be seen as a leftward shift of the AD curve. If you draw the AS-AD model and shift the AD curve inwards, you will clearly see that: output falls, prices fall, and unemployment increases (or equivalently employment decreases - some defense contractors are out of a job).

You are correct on your analysis of an oil shock. Prices rise yet unemployment rises.

This is known as stagflation and is a nightmare for government economists. As if you have seen - fiscal policy - the tweaking of government spending (and tax rates) to influence the economy has its drawbacks. Increasing spending results in lower unemployment but higher prices - inflation. Decreasing spending results in lower inflation - but higher unemployment. When both inflation and unemployment rise - fiscal policy can only solve one problem - and at the expense of exacerbating the other!

Twizzler0171 · #95 Post by **Twizzler0171** » Tue Apr 03, 2007 4:25 pm

Could someone help me with balancing this? I can't quite figure it out -- I may be writing down the formula wrong though. =/ Thanks.

Sulfuric acid (hydrogen sulfate) reacts with sodium hydroxide to produce water and sodium sulfate in an acid-base reaction.

I think this is what it is, I just can't balance it:
H2SO4 + NaOH --> H2O + NaSO4

M. Bison · #96 Post by **M. Bison** » Tue Apr 03, 2007 9:35 pm

Sulfate, SO4, has a 2- ion charge and sodium is 1+, so sodium sulfate is Na2SO4.

After that, the balancing is trivial:

H2SO4 + 2NaOH ---> 2H2O + Na2SO4

Twizzler0171 · #97 Post by **Twizzler0171** » Wed Apr 04, 2007 12:19 am

Ah! That's correct. I remembered it on the Hydrogen atom (mainly because it was a diatomic element, I think) but had forgotten to insert it onto the Nitrogen atom... that's where I was going wrong.

Thanks a lot! ^^

Zilary · #98 Post by **Zilary** » Mon Apr 09, 2007 3:32 am

If f is a continuous function and F'(x) = f(x) for all real numbers x, then...

...the integral from 1 to 3, f(2x)dx=??

a) 2F(3) - 2F(1)
b) 0.5F(3) - 0.5F(1)
c) 2F(6) - 2F(2)
d) F(6) - F(2)
e) 0.5F(6) - 0.5F(2)

(Man, there's an AP test coming up in 3 weeks and I can't even get the EASY stuff...*cries*)

pipsqueeek · #99 Post by **pipsqueeek** » Mon Apr 09, 2007 3:50 am

I'd do this sort of guess and check. antiderivative of f(x) is F(x), so try F(2x). Taking the derivative of that gives you 2*f(2x), so divide by two and you've got F(2x)/2, from 1 to 3. So, (F(6)-F(2))/2
or e) .5F(6) - .5F(2)

Zilary · #100 Post by **Zilary** » Mon Apr 09, 2007 3:54 am

Thanks!! I really appreciated your help

Harmonize · #101 Post by **Harmonize** » Fri May 18, 2007 8:37 pm

I'm really confused. Ive done the correct method for working it out and stuff, but for some reason I'm not getting the same answer in the answer book, so I must be getting it wrong.

Q) A yacht sails x km due east from a marker O then y km due north to buoy B. Calculate the magnitude and direction of the displacement vector OB --> when:

x = 5, y = 8

Ok, so I've worked out the displacement, easy enough, but I cant get the direction of the displacement right

Thanks loads in advance.

EDIT: -_- Never mind, I worked it out.

Anoohilator · #102 Post by **Anoohilator** » Fri May 18, 2007 8:42 pm

Have you tried 90° - the angle you got? I used to have a problem with assuming it had to be given as a bearing, and being VERY confused with the angle being given as anticlockwise from the horizontal axis

EDIT: Never mind you worked it out

Can I know what the problem was? Got an AS exam this Monday, and would always be useful to know..

Harmonize · #103 Post by **Harmonize** » Fri May 18, 2007 10:00 pm

Anoohilator wrote:Have you tried 90° - the angle you got? I used to have a problem with assuming it had to be given as a bearing, and being VERY confused with the angle being given as anticlockwise from the horizontal axis

EDIT: Never mind you worked it out Can I know what the problem was? Got an AS exam this Monday, and would always be useful to know..

Well basically I kept forgetting I have to do sin^-1

To work it out had to go something like this:

9.4/sin90 = 8/sin?

9.4 = 8sin90/sin?

8sin90/9.4 = sin?

sin^-1(8sin90/9.4) = ?

Anoohilator · #104 Post by **Anoohilator** » Fri May 18, 2007 10:25 pm

Why not just use normal right-angled triangle trigonometry? SOH CAH TOA and all that jazz..

Harmonize · #105 Post by **Harmonize** » Fri May 18, 2007 10:36 pm

Anoohilator wrote:Why not just use normal right-angled triangle trigonometry? SOH CAH TOA and all that jazz..

...Cause its half 11 and I'm too tired to use my brain lol