Recent content by Neophyte

Homework Statement I know D . n(hat)dS =Qencl I do not really have problems with the dS or Qencl but I do not really know why they choose the gaussian surfaces. Like on the second page where z> pi/2 It seems to me that one would go from (pi/2) to z but won't z effectively just be...

Homework Statement 4 -2 0 -2 | 32 -2 4 -2 0 | 0 0 -2 4 -2 | 0 -2 0 -2 4 | -32So I am trying to have MATLAB come up with the answer for this with a,b,c,d as arbitrary. Homework Equations The Attempt at a Solution I have tried...

Homework Statement [PLAIN]http://img841.imageshack.us/img841/1456/pforum.png Is the Vx in this connected to the 14[V] source and the 3.9 [kΩ]? I basically just want to look at it like a voltage source but I think it is incorrect. I mean can it still be considered a closed loop? :redface:

-(1/f) - (1/O) = (1/i) -(1/6.5) -(1/9.6) = 1/i = 0.258 i1 = -3.87 :redface: d = 13 cm o2 = d - i1 o2 = 13 +3.875 o2 = 16.875 cm 1/i2 = (1/f) - (1/o2) 1/0.07587 = (1/7.4) - (1/16.875) i2 = 13.179 Thank you both :smile:

Homework Statement Two Lens systems: Lens one is a diverging lens and lens two is converging O1 (object distance) = 9.6 cm Focal length F1= 6.5 cm distance between the two lenses is 13 cm F2 = 7.4 cm Find the image distance i2 for the image produced by lens 2 (the final image...

I think I love you.:!) It was the perpendicular to R part I had forgotten, thank you for your help.

Homework Statement Figure below shows two very long straight wires (in cross section) that each carry a current of 4.26 A directly out of the page. Distance d1 = 6.01 m and distance d2 = 4.18 m. What is the magnitude of the net magnetic field at point P, which lies on a perpendicular bisector...

Homework Statement Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of H+ is decreased by a factor of 3? Just put in the number as a whole number or fraction. Homework Equations The Attempt at a Solution...

Homework Statement What is the heat change in J associated with 80.7 g of liquid water at 5.00 ° C changing to solid water at -5.00 °C? Homework Equations c(H2 O) (liq) = 4.184 J/(g.K) c(H2O) (s) = 2.09 J/ (g.K) DHfus(H2 O) = 6.02 kJ/mol The Attempt at a Solution Δt = 5°...

No, it was simply marked incorrect so I am unsure of the actual answer. I just looked up osmolarity after you mentioned it. My book unfortunately neglected it :(. This is the first encounter with it so I was not sure if the method of obtaining it was correct. "the osmolarity of a simple...

So it is 3.49E-3 * 4 = 1.40E-2 ? Thank you for your help.

Homework Statement How many moles of solute particles are present in 5.07 mL of 0.688 M Na3PO4? Use scientific notation with 3 significant figures! Homework Equations The Attempt at a Solution 0.00507 L of soln 0.688 M M= mol solute / L of soln 0.688 = x / 0.00507 .688 *...

Basically I am taking the lab concurrently with the class, unfortunately we learn how to do the lab a few weeks after we do it so its becoming quite depressing. I could probably slide out of it with a B or C and get absolutely nothing out of it. I should have waited to take it butI didnt realize...

Hm, So... c) Vo = 100m/s v(t) = -10t + 100m/s 0 -100/-10 = t t = 10 s x(10) = -500 + 1000 = 500m d) = 20 s?

Homework Statement A rocket starting at rest takes on a net acceleration of 20m/s^2 in a vertical line until it runs out of fuel after 5 seconds. At what height does it run out of fuel? What is its velocity when it runs out of fuel? What is its maximum height? How long does it take to hit the...