# Search results

2. ### LED help again!

On the datasheet for an LED I can see that peak current, for the specific model I am looking at, is 100mA pulsed at 0.1ms. So 135mA would definitely damage the LED. Looking at this datasheet, I would say you should be shooting for about 20 to 25mA to start. Put a resistor in series between...

4. ### Expressing a series as a function

Ok, thank you for your advice. I guess i will do a bunch of questions to drill it into my brain. I wrote down those taylor series before your reply because i kept seeing them online. Well, at least i only have to memorize 4. Again thank you.
5. ### Expressing a series as a function

I can't seem to be able to come to the conclusion that you have gomunkul51 unless i follow the method used from the following site http://www.cliffsnotes.com/study_guide/Taylor-Series.topicArticleId-19736,articleId-19727.html" [Broken] I know i should probably just stay quiet and deal with it...
6. ### Expressing a series as a function

Thank you, i now know which chapter to re-read. Greatly appreciated.
7. ### Expressing a series as a function

Homework Statement I seem to have forgotten how to express a series as a function. I took calc 2 over the summer so we rushed through everything and i don't think all that information got a chance to settle. So here is the question. I'm going to try using syntax but i will write it out as...
8. ### Catenary - find rope length Maple must be used

I have solved the problem, but it makes me feel good to see that a bunch of people viewed the thread and no replies. I assume it was a brain buster for the people who viewed it. Fact remains I couldn't find an exact value, but i achieved the desired decimal place accuracy.
9. ### Catenary - find rope length Maple must be used

Homework Statement Utilities companies usually use a separation between poles about 340 feet. These poles are 34 feet tall and due to restrictions due to maximum height of trucks using interstates and state routes, the minimum clearance is 20 feet (and also considering the increase of sag...
10. ### Projectile motion without time and initial velocity

Ok, I believe i found my source of error. When solving for initial velocity equation (7) should turn out as following: 7) Vi = sqrt( ((g)(xf^2)) / ((2)(cos^2(angle))((-yi) - (xf)(tan(angle)))) I left out the cos^2(angle). I redid the calculations and yielded the answer in the back of the...
11. ### Projectile motion without time and initial velocity

Notice that my g = -9.8 m/s^2 . So the negative sign makes up for the presence of a positive g rather than a negative. I will redo my calculations now and get back to you.
12. ### Projectile motion without time and initial velocity

So the given data is as follows: angle = 42 degrees yf = 0m yi = 2.1m xi = 0m xf = 17m I used the given data to produce the following six equations where "t" is time and "V" is velocity and "g" is the acceleration due to gravity -9.8m/s^2. 1) Vfx = (Vi)(cos(angle)) 2) xf =...
13. ### Projectile motion without time and initial velocity

Homework Statement A shotputter projects the shot at 42 degrees to the horizontal from a height of 2.1 m. It lands 17 m away horizontally. Next, he gives it the same initial speed but changes the angle to 40 degrees. What effect does this have on the horizontal range? Homework...
14. ### Area of a vertically sliced circle

I do need to use calculus. I need to use trigonometric substitutions and integration. The method provided by HallsofIvy is the one i must use. I followed through with the integral but now I am stuck at trying to solve for X. What I have is: sin^-1(x/7)+sin(2(sin^-1(x/7))) = pi/6...
15. ### Area of a vertically sliced circle

Homework Statement A circle of radius 7 inches is sliced vertically, parallel to the y-axis, into three pieces. Each piece has an equal area. What is the width, x-axis, of each piece? Homework Equations f(x)= +/- sqrt((r^2)-(x^2)) where "r" is the radius. The Attempt at a...
16. ### A logical proof of a creator?

[Place in correct section if i have not] This video was brought to my attention to be, as the title suggests, a logical proof of a creator. Although it is obvious as to which religion the speaker associates himself with, it doesn't seem to interfere with his explanation. I am posting this...
17. ### Complex area between curves problem.

Excellent. Thank you for your help. I really appreciate it. I am a new member on this site and I will try and contribute as much as possible as a sign of my gratitude.
18. ### Complex area between curves problem.

I did it using Maple. Much quicker and easier but it really frustrated me that I couldn't do it by hand. I'm sure I made an error somewhere and with finals coming up i don't have the leisure time to be go over it again. As for the absolute value "a" i thought i knew why, but when i thought...
19. ### Complex area between curves problem.

I created an equation for the integral I. Each time I solved for an unknown I plugged it into the equation of the integral so as to eliminate the unknowns in it as well. My result was an answer too long to type and impossible to simplify further. I am going to try this using Maple as that is...
20. ### Calculating the limit

I'm not sure, but I think L'hopital's rule may work. http://en.wikipedia.org/wiki/L%27H%C3%B4pital%27s_rule
21. ### Complex area between curves problem.

So i have the three equations: (1) 3a(B^2)+2rB+s=0 (2) a(A^3)+r(A^2)+sA+t=0 (3) a(B^3)+r(B^2)+sB+t=0 I equated (2) and (3) to remove "t" from the equation and my result was: (4) a((A^3)-(B^3))+r((A^2)-(B^2))+s(A-B)=0 I solved for "s" in equation (1): (1) s=-3a(B^2)-2rB...
22. ### Complex area between curves problem.

Ok, you were tremendously helpful in moving me along, but i seem to be stuck once more. I used substitution rules and was able to get rid of two of the four variables. I ran out of equations to use to get rid of the last unknown. Any thoughts as to where I may be going wrong.
23. ### Complex area between curves problem.

Homework Statement I am working on a Calculus I project and the last question has me stunned. I would really appreciate some assistance in this. Maybe a push in the right direction. So here is the problem word for word. There is also an attachment containing a picture of the problem...
24. ### Challenging Indefinite Integral e^arccos x

Wow. I would say I can't believe how simple the question truly was, but trigonometric identities always get me. Thanks for pointing that out to me. I appreciate the help.
25. ### Challenging Indefinite Integral e^arccos x

Homework Statement Integrate: ((e^arccos(x))(dx))/(sqrt(1-x^2)) Image of the question is attached. Homework Equations The Attempt at a Solution I think i took the right first step for substitution: u=arccos(x); cos(u)=x; (du)(-sin(u))=dx Substituting u into the...