Recent content by Chas3down

oh 12.5 per second yeah my bad, thanks

Homework Statement A capacitor C is charged to an initial potential of 70.0 V, with an initial charge of Q0. It is in a circuit with a switch and an inductor with inductance L = 4.03×10-2 H and resistance RL. At t=0, the switch is closed, and the curve below shows the potential V across the...

Homework Statement R = all real numbers F(x) = { y in R : sin(y) = x} 1. Is F a mapping from R to R 2. Describe the three sets F(5), F(0), F(1). 3.Can F be represtented as a function from R to R 4. Give two different choices of X and Y (take both X and Y to be subsets of ?) so that F can...

Homework Statement Determine whether or not f(x,y) is a conservative vector field. f(x,y) = <-3e^(-3x)sin(-3y),-3e^(-3x)cos(-3y) > If F is a conservative fector field find F = gradient of f Homework Equations N/A The Attempt at a Solution Fx = -3e^(-3x)(-3)cos(-3y) Fy =...

Ah, thanks a bunch! Solution: ((1/18)pi(3),0), ((1/18)pi(-1),0), ((1/18)pi(-3),0), ((1/18)pi(1),0)

Thanks, solved!

Oops, I tried it correctly first but then swapped to see if that helped with anything, i put it back in x/y But, i redid the problem and got.. y=0, x = (1/18)pi(4n-1) y=0, x = (1/18)pi(4n+1) Not sure how to translate that to the 4 closest points? Tried this but didn't work...

edit: never my idea didn't work

Homework Statement Find the absolute maximum and minimum values of f(x,y) = y^2+x^2 -4x + 11 on the set D where D is the closed triangular region with vertices (8,0),(0,4) , and (0,-4) . Homework EquationsThe Attempt at a Solution [/B] fx = 2x - 4 fy = 2y Critical point = (2,0) The...

Homework Statement Find the 4 critical points f(x,y) = 5ycos(9x) closest to (0,0) Homework EquationsThe Attempt at a Solution fx = -45ysin(9x) fy = 5cos(9x) fxx = -45*9ycos(9x) fyy = 0 fxy = -45sin(9x) y=0 x=pi/18 (0,pi/18) (0,pi/18 + pi/2) (0,pi/18 - pi/2) (0,pi/18 + 3pi/2) Was not...

There isn't one, it just says if it is correct or not (anwser must be exact) With further research, it seems one angle is "arcsin(13/32)/2" , which is what I had but in decimal form, however can't find the second angle.. , i tried 90 - arcsin(13/32)/2, 180 - arcsin(13/32)/2, 360 -...

Homework Statement Firing something at 40m/s at angle X, it lands 65meters away, give 2 angles it could be.. (Assume g=10m/s^2)(Fired at y=0)(No air resistance) Homework Equations D = v^2/g sin(2x) [/B] The Attempt at a Solution d= v^2/g sin(2x) 65 = 40^2/10 sin(2x) 650/1600 = sin(2x)...

I was watching a tv show and they stated... If you know the exact position and velocity of every particle you can accuratly predict the future for the rest of time. However I know that you cannot know the exact position AND velocity of a sub atomic particle. How accurate is the first...

I never had to do anything with the domain, it just worked.. But i guessed 0, pi/2 and 3. I thought it was be pi/2 because that's where it goes from neg to pos.

Homework Statement integral of 1/sqrt(9-x^2) from 0 to 3 Homework Equations /// The Attempt at a Solution I integrate it correct to arcsin(x/3) from 0 to 3 Get the correct anwser of pi/2. But there is another question, At which value of x in the integration region [0,3]...