Recent content by Gil-H

Homework Statement An automobile battery that is originally fully charged gradually discharges while sitting on a shelf at a constant temperature of 40C, producing no electric work but resulting in a heat transfer of 1000kJ to its environment. The battery is then recharged to its initial...

Homework Statement Calculate the final temperature of a sample of argon of mass 12.0 g that is expanded reversibly and adiabatically from 1.0 L at 273.15 K to 3.0 L. Homework Equations The Attempt at a Solution n = 12[g]/40[g][mol]-1 = 0.3 [mol] pVi=nRTi p =...

Now I got that! Thank you very much! By doing that I achieved that: q1 + q2 + q3 = -q4 q2 + q3 + q4 = -q1 and with: q1 + q2 = 2q q3 + q4 = -q I ended up with: q1 = 0.5q q2 = 1.5q q3 = -1.5q q4 = 0.5q which is the correct answer! :-)

Thanks. You gave something to think about. But I'm not sure I follow completely. Because the field inside each plate is zero, I used gaussian surface which encloses q2 and q3, and that leads me to that: q2 + q3 = 0, and together with: q1 + q2 = 2q q3 + q4 = -q I have three equations...

Homework Statement Consider two infinite conducting plates of some thickness with charge 2q and -q. The system is in equilibrium, which means there's no charged particles in motion. Find the charge distribution on the surfaces of each plate. (designated as q1 q2 q3 and q4) Homework...

I got -.02 because I was unawarely working in degrees. I should be .0354 But after advice I got, I changed the wavefunction to be: y(x,t) = -0.05sin(5πx-60πt) (I added a minus sign) That's because of the condition that (dy/dt)|(t=0) > 0. Anyway, thanks for trying to help (-:

Thanks. I've set A to be -0.05 and it worked.

Homework Statement Monochromatic transverse wave is propagating in the positive x direction on a string (neither end is fixed). The wave velocity is 12 m/s, amplitude 0.05 m, and wavelength is 0.4 m. At t=0 and x=0 the string altitude is 0, and moving in the positive y direction [i.e...

Homework Statement Monochromatic transverse wave is propagating in the positive x direction on a string (neither end is fixed). The wave velocity is 12 m/s, amplitude 0.05 m, and wavelength is 0.4 m. At t=0 and x=0 the string altitude is 0, and moving in the positive y direction [i.e...

Homework Statement What volume of air (T=25C, P=1atm) is required for complete combustion of one litter of gasoline? The partial pressure of oxygen in the air is 0.205 atm. One litter of gasoline contains 6.15 moles octane C8H18. Homework Equations The unbalanced reaction is: C8H18...

Problem solved. And thank you for the remark. I'll keep that in mind.

Homework Statement A sample of gaseous substance composed of only hydrogen and boron, underwent combustion with excess oxygen. As a result, all the hydrogen turned into water, and all the boron turned into B2O3. a) find the empirical formula of the substance? b) find the chemical formula...