how do you solve this
if av=63 vb=6.0 fb=45 :confused:
what are the steps you use
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how do you solve this
if av=63 vb=6.0 fb=45 :confused:
what are the steps you use
PEMDAS my friend. Start with the squared term in the denominator, evaluate the rest of the fraction. Then remember to multiply then add.Quote:
Originally Posted by boondock
Jameson
so 0.159 squared is .025 right? then i divide by 45? i get 5.62^-3 i think i did somethig wrong or is it 177.866
Start by evaluating the (Fb/0.159)^2 term.
This is:
(45/0.159)^2 ~= (283.02 )^2 ~= 80.1 10^3.
RonL
Lv = {[Av *1.84 *10^8] / [Vb *1728 *(Fb/0.159)^2]} -{0.823*sqrt(Av)}Quote:
how do you solve this
Lv = {[Av *1.84 *10^8] / [Vb *1728 *(Fb/0.159)^2]} -{0.823*sqrt(Av)}
if av=63 vb=6.0 fb=45
what are the steps you use
Lv = {[63 *1.84 *10^8] / [6.0 *1728 *(45/0.159)^2]} -{0.823*sqrt(63)}
Lv = {[115.92 *10^8] / [10,368*(283.019)^2]} -{0.823 *7.937}
Lv = {[115.92 *10^8] / [10,368*80,100]} -{6.532}
Lv = {[115.92 *10^8] / [830,476,800]} -{6.532}
Lv = {[115.92 *10^8] / [8.305 *10^8]} -{6.532}
Lv = {(115.92 / 8.305) *10^(8-8)} -6.532
Lv = {13.958 *10^(0)} -6.532
Lv = {13.958 *1} -6.532
Lv = 13.958 -6.532
Lv = 7.426 -----------------answer.
thank you so much i see now
how did you get Lv = {[115.92 *10^8] / [8.305 *10^8]} -{6.532}
where did this come from [8.305 *10^8] :confused:
I guess these are for me to answer.Quote:
how did you get Lv = {[115.92 *10^8] / [8.305 *10^8]} -{6.532}
where did this come from [8.305 *10^8]
--------------------------
Okay, here is a copy of my solution:Quote:
how did you get Lv = {[115.92 *10^8] / [8.305 *10^8]} -{6.532}
There are 11 lines. The eleventh is the answer.Quote:
Lv = {[Av *1.84 *10^8] / [Vb *1728 *(Fb/0.159)^2]} -{0.823*sqrt(Av)}
Lv = {[63 *1.84 *10^8] / [6.0 *1728 *(45/0.159)^2]} -{0.823*sqrt(63)}
Lv = {[115.92 *10^8] / [10,368*(283.019)^2]} -{0.823 *7.937}
Lv = {[115.92 *10^8] / [10,368*80,100]} -{6.532}
Lv = {[115.92 *10^8] / [830,476,800]} -{6.532}
Lv = {[115.92 *10^8] / [8.305 *10^8]} -{6.532}
Lv = {(115.92 / 8.305) *10^(8-8)} -6.532
Lv = {13.958 *10^(0)} -6.532
Lv = {13.958 *1} -6.532
Lv = 13.958 -6.532
Lv = 7.426 -----------------answer.
You are asking me how I got the 6th line.
If I say I got it by doing the first 5 lines above it, would you believe me?
-----------------------
Let us go back to the 5th line,Quote:
where did this come from [8.305 *10^8]
Lv = {[115.92 *10^8] / [830,476,800]} -{6.532}
There is the 830,476,800.
It is 830Millions, +476Thousands, +800.
The decimal point is at the end of the 800, or at the end of the 830,476,800.
If you want to express the 830,476,800 in engineering mode, or in a small number times 10^(something), then you place the decimal point all the way to the left, after the first significant number, after the the 8 of the 830Millions.
In so doing, how many decimal places, or how many numbers did you pass over? Count them. From the decimal point being at the end of 830,476,800 to the decimal point being moved to between 8 and 3 of the 830Millions?
Did you count 8 decimal places? If yes, then you are correct.
So, now the 830,476,800. is transformed into
8.30476800 *10^8
or, 8.304768 *10^8
Since in your original equation you used only 3 decimal places for the numbers less than 1, [1.84, 0.159, 0.823], then I followed your lead. I reduced/expressed the 8.304768 to 8.305 only.
Do I have to ask you why I used "5" only for the whole "4768"?
You have not been taught in school about "rounding up" yet?
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May I add this:
830,476,800
is the same as 8.305 *10^8,
the same as 83.048 *10^7,
the same as 8,304.768 *10^5,
the same as 0.00083 *10^12
ok i got you thanks for all the help you are the best
ok i got you thanks for all the help you are the best
i did an other one can you tell me if it is ok
16*1.84*10^8/1.296*1728*80100-3.292 =13.118
av=16 vb=1.296 fb=45
Yes. Very good.Quote:
i did an other one can you tell me if it is ok
16*1.84*10^8/1.296*1728*80100-3.292 =13.118
av=16 vb=1.296 fb=45
thanks :D