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  1. Z

    Equations Involving Vectorssss

    Equations Involving Vectorssss.... hey guys...stuck on a hw problem here... very simple but...im not sure how to start... Here is the question: Find a vector equation and parametric equations for: The line through the point (1,0,6) and perpendicular to the plane x + 3y +z =5 can i...
  2. Z

    Infinite series please help.

    I'm having a little trouble with the following problem. here it is... Determinte whether a_n is convergent for... a_n = \frac{2n}{3n+1} How would i go about solving this? Can i just simply take the limit and use L'Hospital's rule to see if it diverges or converges? Or is it a little...
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    Finding the Volume

    Hey everyone...I need to find the volume of the following shape... y= \frac{1}{x}, y=0, x=1, x=3 rotated about y=-1 ok so, i drew out the shape, and for the radius i came up with: r= \frac{1}{x} + 1 I think thats correct...so assuming that my radius is right, then the...
  4. Z

    Quick integral question

    oh ok...cool. Thanks guys
  5. Z

    Quick integral question

    ok here is the integral...sorry for the laziness... integral of dt/(t^4)-25 would this just turn out to be (t^4)-25 since you can bring up the denominator to the top as (something)^-1....then just take the antiderivative...? hope that makes sense edit: ok that wont work...so I think i...
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    Physics: the carnot cycle

    hey everyone, I need some help solving the following problem. I am kind of confused on where to start. here is the question from the book. A carnot refrigerator is operated between two heat reservoirs at temperatures of 320K and 270K. a) If in each cycle the refrigerator receives 415J...
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    Finding F(1) and F'(1)

    ok i got it ..thank you.
  8. Z

    Mind boggled.(integrals)

    You have the basic concept down. I guess the most effective way to get good is to practice. I used to be horrible at integrals, but i have gotten much better, yet I am no expert...i practiced a lot. get familiar with all of the different techniques of integrals, like u substitution, trig sub, by...
  9. Z

    Finding F(1) and F'(1)

    Ok i have another problemo here... if F(x) = \int_{-x}^{x} \frac{dt}{1+t^2} Find F(1) and F'(1)....I need some assistance...the anti derivative is arctan(t) so then.... do i set that equal to f(1) and solve for t? and then for F', take the derivative and then solve for t again...
  10. Z

    Need help with this Integral

    ahhh..DUH! goshh...how did i NOT see that??? Thanks man...haha...
  11. Z

    Need help with this Integral

    Hey whats up..I need a little help with the following problem. If \int_{-\frac{\pi}{2}}^{M} \cos x dx= 1.5}, find M. How do I go about doing this? I know that...the anti derivative of cos is sin, and that \sin x \right]_{-\frac{pi}{2}}^{M} = 1.5 Any help would be greatly appreciated...
  12. Z

    Can you feel the HEAT?

    Can Anyone help? Thats all that was given in the question...
  13. Z

    Can you feel the HEAT?

    hey whats up guys, I need some help solving a hw problem for physics... here is the question. A gasonline engine has a power output of 180 kW (241hp). Its thermal efficiency is 28%. a) How much heat must be supplied to the engine per second? b) How much heat is discarded by the engine per...
  14. Z

    Integral OH YES!

    Ok, here is the integral i seem to be having some issues with. I know there's a very simple step im missing. \int_{}^{} e^x \sin(\pi x) dx i attempted to do this using by parts integration. I tried u = \sin(\pi x) so du= \pi \cos(\pi x) dx so then dv= e^x dx and v= e^x...
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    Calorimetry copper pot problem

    Sweet...thanks a lot man.
  16. Z

    Calorimetry copper pot problem

    Hey whats up, I am stuck on the following problem. a copper pot with mass of 0.5kg contains 0.170kg of water at a temperature of 20C. A 0.250kg block of iron at 85C is dropped into the pot. Find the final temperature assuming not heat loss. Ok, so Here is what i was thinking about...
  17. Z

    Really quick easy question

    ok great..thanks a lot..
  18. Z

    Really quick easy question

    Ok sorry for this..small, stupid obvious question...but here it is.. i need to solve for k in: e^10k = .75 So do i just take the natural log of both sides...and then the 10k should come down and i can just solve for k from that, right?
  19. Z

    Integrals, oh yeah

    great...thanks a lot guys...i got the right answer for the problem. i just used the substitution of u = \frac{\pi{t}}{12} and brought out all of the constants. Thanks again.
  20. Z

    Integrals, oh yeah

    wait maybe i dont see it....would i let u= sin pi t/12? and then get du......?
  21. Z

    Integrals, oh yeah

    integrals, oh yeah...... hey whats up, Ok so....i am having a little bit of a problem on solving the following integral... \int_{0}^{12} 50 + 14 sin\frac{\pi t}{12} dt would i use....trig substitution or by parts?.... :uhh: yeah...i need some help..thanks.
  22. Z

    One thing I've noticed in this/these forum/s

    People who start complaining about the quality of the responses they get, i think thats kinda messed up. If you're asking questions on this forum you're looking for any kind of help, and the people who take time to answer the questions are trying to help. This isnt a place to ask a question and...
  23. Z

    Trig question confused

    hm.. still don't get it I understand that for every 1 pedal, the 2in circle goes 2 revolutions. How do I figure out the speed from this?.. I'm stuck/confused..
  24. Z

    Trig question confused

    hey whats up guys...i was trying to figure out this problem, but...I just cant see to get how to start. If someone can help me...that would be really nice. Its number 2 on this link... http://success.shoreline.edu/SarahLeyden/Classes/Current/Math%20120/Synthesizers/Synthesizer%202.pdf [Broken]
  25. Z

    Fundamental THeoreom of Cal

    yeah well, im usually Being helped instead of Helping others...so...hey i tried
  26. Z

    Fundamental THeoreom of Cal

    you need to find the antiderivative of that function, and then do F(3) - F(x) (correct me if im wrong anyone). But yeah, i believe thats what you have to do.
  27. Z

    Leaping the river

    Yeah, it does help. So basically for one of the equations ill get something like t= v and i can plug that t into the other equation and find v. thanks guys.
  28. Z

    Leaping the river

    here's the question...ill make it short a guy wants to leap a river. THe takeoff ramp is inclined at 53 degrees. The river is 40m wide, and the far bank where he is gonna land is 15m below the top of the take off ramp. The river itself is 100 m below the ramp. Ignoring air resistence, find...
  29. Z

    Hit the Monkey

    The monkey and the dart would probably be right above the ground at the point of contact. So...if the tree is 90 meters high, then i can use -90 as the Y in the height function to find t, and then plug that t into x = [v cos(a)]t, does that seem right?
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