anonymous
  • anonymous
Solve V = π r2h for h. Show all work. Help?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
welcome to openstudy
anonymous
  • anonymous
r = 1.35 h = 12.7
dan815
  • dan815
hi

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dan815
  • dan815
why dont you substitute those numbers into the formula and solve it
tkhunny
  • tkhunny
Divide by \(\pi r^{2}\). \(\left(\pi r^{2}\right)\) is attached to 'h' via multiplication. Detach it via division.
anonymous
  • anonymous
@dan815 i clearly have done so already, but not coming up with the 'correct' answer according to the rest of the problem i'm inserting it into, hence why I'm seeing if im doing it wrong.
anonymous
  • anonymous
@tkhunny hi ther, thanks, but i'm not trying to solvefor h, i'm subsituting the numbers i posted above. . . seem to be coming up incorrect according to the book/problem set
dan815
  • dan815
what is the object you are trying to find the integral of?
dan815
  • dan815
volume of* sorry
dan815
  • dan815
is it a cylinder?
tkhunny
  • tkhunny
?? "Solve V = π r2h for h" Perhaps we're speaking a different language? One might ask, why are nyou not trying to solve for h? Are you studying Significant Figures"? What answer are you giving that is being rejected?
bradely
  • bradely
step by step answers posted here http://www.mathskey.com/question2answer/2063/solve-v-%CF%80-r-2-h-for-h ask your Algebra1 homework questions athttp://www.mathskey.com/question2answer/algebra-1 and get free math help. all the best
anonymous
  • anonymous
its a beaker filled with a certain amount of liquid, all a part of a stream of different question s built off this one
anonymous
  • anonymous
@tkhunny because i HAVE h already, as posted above, im trying to find V
anonymous
  • anonymous
this is the complete problem : 5. Calculate the volume of the 50mL graduated cylinder using your measurements of diameter and height, using the formula V = ∏ r2h (r=½ diameter). This is your experimental value. Assuming the accepted value of the volume of the graduated cylinder is 50.00 mL, calculate the percent error of your volume calculation, using the following formula: Percent Error = /accepted value - experimental value/x 100 accepted value
dan815
  • dan815
lets compare answers i get for r = 1.35 h = 12.7 pi*2*r*h = 107.725212092
tkhunny
  • tkhunny
That's okay, but I'm really curious how this is consistent with "Solve V = π r2h for h". Anyway, it appears we ARE studying Significant Figures. Now answer the question. What value are you using that is being rejected?
dan815
  • dan815
that is area tho i think you mean pi * r^2 *h = 72.7145181618
anonymous
  • anonymous
i'm getting 72.7145. . .but when i plug it into the next step in my problem it doesnt make any sense! im getting a negative percentage error
dan815
  • dan815
it says its pir2h so u shud use the other one 107.725212092
dan815
  • dan815
your question is wrong i think it shud say pir^2*2 not pi*r2h
tkhunny
  • tkhunny
Well, a negative value isn't possible if you are using the absolute values. Are you using the absolute values? Also, 72.71415 is no good. Use 72.7
dan815
  • dan815
pi*r^2 *h |dw:1362879713114:dw|
anonymous
  • anonymous
im totally stumped this is the exact problem taken off the homework, nothing seems to fit
dan815
  • dan815
i will help you okay!! if you let me help you
dan815
  • dan815
what is your R and H?
anonymous
  • anonymous
@dan815 ok thank you. . .im given D = 2.7 and H = 12.7 and r is 1/2 of D
tkhunny
  • tkhunny
Well, 72.7 mL is a rather horrible approximation for a 50.0 mL beaker. Maybe something else went wrong. Or, maybe we're just testing the %-Errors formula. \(\dfrac{|50.0 - 72.7|}{50.00}\cdot 100\;=\;\dfrac{|- 22.7|}{50.00}\cdot 100\;=\;\)
dan815
  • dan815
ok your V = 1.35^2pi*12.7 = 72.7 (72.7-50/50)*100 = ansswer to 2 decimal places
dan815
  • dan815
45.43%
dan815
  • dan815
u understand?
anonymous
  • anonymous
its a negative number because its the accepted (50) minus the experiemental number, not the other way around thats why im not understanding
dan815
  • dan815
wuts a negative number?
dan815
  • dan815
is the percentage negative?
anonymous
  • anonymous
the result is negative
dan815
  • dan815
oh okay then its -45.43%
anonymous
  • anonymous
how is it possible to have a regative as an answer to this particular question tho?
dan815
  • dan815
its possible if its -'ve then it means ur value was 45.43% more than the actual value if its positive then its 45.43% less than the actual value
dan815
  • dan815
though i think your question should say do the absolute value of the percentage of error
dan815
  • dan815
but if they are defining the percentage of error without absolute value then u can get negative values
tkhunny
  • tkhunny
You are overlooking the Absolute Values. |50.0 - 72.7| = |72.7 - 50.0| = 22.7 There cannot be a negative value resulting from this operation.
anonymous
  • anonymous
ooohh ok i have no idea i havent been taught absolute values, just thrown this problem set today
dan815
  • dan815
those 2 lines around the numbers mean take the absolute value so whatever the value they are always take the positive of it
anonymous
  • anonymous
i was given this: Percent Error = /accepted value - experimental value/x 100 accepted value written exactly as it is, no boxes or lines around etc
dan815
  • dan815
the equation for absolute value is this |dw:1362882330695:dw|
dan815
  • dan815
always gives positive answer
dan815
  • dan815
those / / mean absolute value
tkhunny
  • tkhunny
What are those slanty lines? Those are supposed to be Absolute Value Symbols. Trust me on this.
dan815
  • dan815
i wish u were asian right now-_-

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