i need help basic math, me forgot formula

Thread Starter

hkra

Joined Jul 3, 2005
18
50 + j282.6

answer = 287 /_ 80º

the 80º how to find out? can anyone show me the formula and steps for scientific calculator to press?

or

50 + j471

answer = 473.6 /_ 84º

the 84º how to find out? can anyone show me the formula and steps for scientific calculator to press?

urgently by.
hkra
(appreciate for your help)
 

Thread Starter

hkra

Joined Jul 3, 2005
18
i did with this formula

http://www.uploadhut.com/upload/192752.jpg??
click on the screenshot i created

but my answer came out was 10 /_ 40.97˚

the correct answer is 36.8 ˚

which is exactly answer?

also i using the formula on picture above but the below 2 my answer wasn't same to the below answer, why?

-

50 + j282.6

answer = 287 /_ 80º

-

50 + j471

answer = 473.6 /_ 84º

hope you can help me! i'll in exam sooner.

thanks alot!
 

Thread Starter

hkra

Joined Jul 3, 2005
18
thx for your help i can solved it

my other question is now

http://tinypic.com/6qfn9s.jpg

IR answer is: 2.31/20 = 120 /_ 0ºA

IY answer is: 2.31/22.36 and -120º+63.43 = 100 /_ -56.57ºA

TB answer is: 2.31/31.62 and +120º-18.43º = 70 /_ 101.57ºA

how come my answer is not same to the picture?

hope you can help me this question

thanks...
 

hgmjr

Joined Jan 28, 2005
9,029
Originally posted by JoeJester@Jul 5 2005, 06:17 PM
my answers don't agree with sire's book.
[post=8923]Quoted post[/post]​
Like JoeJester, I too got answers different from those shown in the three problems. The magnitudes in the answers I calculated were off by a factor of 10.

hgmjr
 

Thread Starter

hkra

Joined Jul 3, 2005
18
i really need all of yours opinion and suggestion. me too answer was different from the origin.
 

Thread Starter

hkra

Joined Jul 3, 2005
18
no no, those i wrote in the quote is my own answers. i'm not sure it is correct or not

IR answer is: 2.31/20 = 120 /_ 0ºA

IY answer is: 2.31/22.36 and -120º+63.43 = 100 /_ -56.57ºA

TB answer is: 2.31/31.62 and +120º-18.43º = 70 /_ 101.57ºA
only answers in the picture below is correct

your answer close to the picture's answers, it seems you are correct.

http://tinypic.com/6qfn9s.jpg

how did you calculated out all of these answer? can you tell me what to press first and later on calculator step by step?
 

Thread Starter

hkra

Joined Jul 3, 2005
18
this one my answer same as yours. but what my problem is the answer i did from my sire's question is not same as what sire's answer.

e.g
2.31/20 = how much you calculated? what is your answer?
my answer is 120 but my sire's answer was 11.55

e.g
-120º+63.43 = how much you calculated? what is your answer?
my answer is -56.57º but my sire's answer was -103.43ºA

you try this 2. i'm confused how come both cannot matches with sire's answers
 

Thread Starter

hkra

Joined Jul 3, 2005
18
sorry my mistaken i never reset the small button on the back of my scientific calculator. i has reset it now the answers came out corrected! thanks you for your informations otherwise i never solved the questions
 
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