Recent content by XianForce

Use c = q/v to find the charge. Then plug that into the second equation at t = 3 s, because the capacitor begins charging at t = 0. So since it reaches 4 V after 3 s of charging, t = 3 s when the capacitor is charged to 4 V.

Homework Statement When an electron drops from the M shell (n = 3) to a vacancy in the K shell (n = 1), the measured wavelength of the emitted x-ray is found to be 0.0897 nm. Identify the element. Homework Equations E = 1240 / λ E = (-13.6 / n^2) * (Zeff^2) The Attempt at a...

Homework Statement Solve X' = [ [9, 4, 0], [-6, -1, 0], [6, 4, 3]] * X using eigenvalues. Homework Equations (A - λI) * K = 0 X = eλt The Attempt at a Solution Set up the characteristic equation to find eigenvalues. I found a root of multiplicity 2 of λ=3 and another distinct root...

I cannot believe I missed that. Thank you!

Homework Statement The circuit shown in the figure below is connected for 3.10 min. (Assume R1 = 7.90 Ω, R2 = 2.60 Ω, and V = 16.0 V.) The circuit shown in the figure below is connected for 3.10 min. (Assume R1 = 7.90 Ω, R2 = 2.60 Ω, and V = 16.0 V.) Homework Equations Kirchoff's...

Yes, but then how do I solve it?

Homework Statement Two insulating spheres have radii 0.300 cm and 0.500 cm, masses 0.450 kg and 0.700 kg, and uniformly distributed charges of -2.00 µC and 3.00 µC. They are released from rest when their centers are separated by 1.00 m. (a) How fast will each be moving when they collide...

Homework Statement Every second at Niagara Falls, some 5.0 10^3 m3 of water falls a distance of 50.0 m. What is the increase in entropy per second due to the falling water? Assume that the mass of the surroundings is so great that its temperature and that of the water stay nearly constant at...

Nevermind, I figured it out. It's m (d/2)^2, not 1/2 * md^2

So basically: 1/4 * 1 mol /(6.022 * 1023) * (70 * 10-3) kg/mol * (780 m/s)2 = 1.768 * 10-20 J , right? But Web Assign keeps telling me that's wrong, so where am I making the mistake?

Homework Statement In a crude model of a rotating diatomic molecule of chlorine (Cl2), the two Cl atoms are 2.00 10^-10 m apart and rotate about their center of mass with angular speed ω = 3.80 10^12 rad/s. What is the rotational kinetic energy of one molecule of Cl2, which has a molar mass...

Oh my gosh, I can't believe I did that XD! Thanks 1000 kg/m^3

(3.89 mol) * (18 g / mol) = 70.02 g = 70.02 * 10^(-3) kg move the decimal over three places: 0.07002 kg, then density of water is 1 kg/ m^3, so: .07002 m^3, right?

Homework Statement (a) How much work is done on the steam when 3.89 mol of water at 100°C boils and becomes 3.89 mol of steam at 100°C at 1.00 atm pressure? (Assume the latent heat of vaporization of water is 2.26 106 J/kg.) (b) Assume the steam to behave as an ideal gas. Determine the...

Yes, I understand the second part, but why would the power be the same through both? What about something being in "steady state" makes that happen?