Recent content by NewSoul

Thanks. To be safe, I went to 9 significant figures and ended up with the apparently correct answer of 2.5 keV. I just don't understand why it wouldn't accept my other answer. We've been using this online program for a while now and it has always been fine when I don't use that many...

Whoops, I do have those two switched! 2.2 didn't work either. I honestly have no idea what the problem is. Nothing obvious, eh?

Homework Statement The K series of the discrete x-ray spectrum of tungsten contains wavelengths of 0.018 5 nm, 0.020 9 nm, and 0.021 5 nm. The K-shell ionization energy is 69.5 keV. (a) Determine the ionization energies of the L, M, and N shells. Homework Equations E=\frac{hc}{\lambda}...

Thanks guys!

Okay, I did some googling on the boat problem and it makes more sense now. Thanks, but would it be incorrect for me to write that the buoyant force is also dependent on the density of the object? Some websites say that this is incorrect, but I don't understand why. It's just the "another...

Hmm. I've never thought of that. It sounds like surface area is the important factor, but that isn't one of my options.

Homework Statement What does buoyant force depend on: the mass of the object, its volume, its density, or the material from which it's made?2. Relevant concepts Archimedes' principle: Buoyant force = weight of displaced liquidThe Attempt at a Solution I just don't quite understand this concept...

EDIT: It seems that just after posting this, my professor decided this problem is too difficult for us to be responsible for. I can't delete this question, so don't feel obligated to answer it. But who knows? Maybe someone else out there has the same question. Homework Statement The Sun...

Ok. I think you need to break this up into steps. First, calculate the x-component for A and B. Then, use what you know to solve for p. After that, you can figure out the rest of C.

Surely you can draw the picture yourself, can't you? Make a plus sign (+). Think of each of the four lines coming out from the center as lines on a compass. Which one will be north? Which will be west? Draw a line that is 40 degrees west from the north line. As for the components...this...

Well, I'm not entirely sure what is meant by the equation U + KE = 0 or if it's relevant...But I do know that a decrease in potential energy would mean an increase in kinetic energy and vice versa. So are you saying that PEg = PEs (KE is zero at the initial and final positions)? I'm afraid...

Homework Statement Here is an illustration to ease understanding: Angle inclined plane: θ = 20.0° spring of force constant k = 525 N/m block: m = 2.71 kg distance of block from spring: d = 0.330 m speed of block: v = 0.750 m/s By what distance is the spring compressed when the block...

Ahh...it didn't mention in the instructions, but I just realized that g must mean the acceleration due to gravity. Gah! I knew it was something simple! With multiplying all of this by gravity, I end up with a much nicer 24.9 ± 0.10 kg/s2. Thanks! Yes, you are correct. ------ Perhaps...

Homework Statement Part 1 (static method): We measured the displacement of a spring (in cm) after adding and subtracting masses (in g). The spring was placed in a vertical position. I am supposed to find the spring constant ks. Part 2 (dynamic method): We did something similar to the...