Recent content by Lifprasir

Oh, well then. I will know to interpolate next time around from the tables. Thanks for the help.

It must be due to my rounding, I am using the Z table from the back of my book so I lose precision I guess.

Homework Statement 2. Homework Equations [/B] So the sample mean is 2. the sample variance would be [[(3-1+1)-1]/12]/36 = 8/432. The Attempt at a Solution Is it, P[ (2.1-2)/sqrt(8/432) < z < (2.5-2)/sqrt(8/432)] = 0.232574. The book answer is 0.2312. I just want to be sure.

I do not know how to formulate formulas on this forum so I just wrote it neatly on a piece of paper and linked it. http://puu.sh/8fwXr.jpg Thankss.

What is the difference between "tangential and normal components" and "radial and transverse components" ? I mean in both cases, the two components are perpendicular to each other and one of the components causes the particle to rotated around, the other one gives it a speed to rotate with. Is...

right! I remember that theorem from calculus I, thank you so much! I appreciate the help a lot. :)

Okay, so, I can do arccos (0.131054) = 82.47, but the other angle that would also satisfy this would be -82.47, or 277.53, now substracting 55, i would get 222.53 for alpha. This 222.53 would result in a resultant vector of 600N, but how do i know, in between 27.47 to 222.53, the resultant...

mm, okay I followed your procedure, and I was able to get 27.47 as the angle for which gives 600N like this: setting x = alpha + 55 sum of y-axis = sin x sum of x-axis = cos x + 1.838 600/272 = 2.20 so, 2.20^2 = sin^2 x + cos^2 + 1.838^2 + 2*1.838*cos x it simplifies to 0.131054 = cos (x)...

Homework Statement http://puu.sh/4NWw9.PNG question 2.65** Homework Equations I've tried using the law of sine and law of cosine method with the triangle for equilibrium and I've tried the 600^2 = Fx^2 + Fy^2 The Attempt at a Solution Here is what I did using the F^2 = Fx^2 + Fy^2...

ooooooh. thanks!

Homework Statement Use differentiation to find a power series representation for f(x)=1/(1+x)2 Homework Equations The Attempt at a Solution 1/(1-x) = \sum(x)n 1/(1-(-x)) = \sum(-x)n Deriving 1/(1-(-x)) -1/(1-(-x))2= \sumn(-x)n-1 from n=1 to infinity indexing it from...

Homework Statement http://puu.sh/1rcsO I got the first one from a simple scaling, but I can not figure out the second one. Homework Equations Det(cA) = cDet(A) Scaling a row scales the determinant Adding rows/columns to each other does not affect the determinant Det(AT) = Det A...

Ooooooooooooooooooooh. Thank you so much!

*new question, playing with projection matrix. Well I have a new question about the A(ATA)-1AT matrix. http://puu.sh/1jXT6 I was able to show that BT was idempotent, but my manipulation was a bit different from the teacher for B2 Let B2 = (A(ATA)-1AT)(A(ATA)-1AT) I did...

They say that electrons move from the higher potential to the lower potential. For example, in this situation. Q1 and Q2 are negative charges and Q3 is positive. But, the equipotential is lower on the Q1 and Q2, so by definition of potential difference, the electron would go from the...