Recent content by whatisphysics

Hi everyone I am trying to find the current of a circuit using linear algebra. So far, I know that there are 6 loops, one on each side of the cube. However, I am not sure about how many equations I have to come up with to construct a matrix and thus solving the problem. The questions is...

Homework Statement (〖5x^3〗+〖4x^2〗-4)/((x^3)(x+1)) Homework Equations Partial Fractions The Attempt at a Solution I know that I need to use partial fractions. But I don't know how to put it in (A/x)+(B/x)...etc Would someone please kindly show me how to set up this equation...

Homework Statement I have attached my question. I don't understand how A can turn into B? (the highlighted parts) Homework Equations The Attempt at a Solution I finished the whole question, but I don't understand why arcsec turns into arctan...

If I'm understanding this correctly, for questions 3 and 4, the difference in potential energy will be equal to the kinetic energy when the charge 'falls' to the negative plate; correct? So, it would be like: K + U = K + U Initially at a point, it will have zero kinetic energy, but it has...

Okay, so for #2, do I use U = qV = k(q/r)? If so, wouldn't that be the exact same value as work? One thing I really don't quite understand is why my textbook says: W = -U Thanks in advance!

So, what would the difference in charge between two points be? Is that potential energy then? thanks for such a quick response! And this might sound silly, what's the difference between potential difference and potential energy? I'm really confused by all the 'potentials'.

According to my textbook, its the difference in charge between two points?

Homework Statement 1. How much work is required to move q1 from the negative plate to points A, B, or C? 2. What is the potential energy of q1 at A, B, or C? 3. If q1 is released, what will be the change in its potential energy as it 'falls' to the negative plate from A, B, or C? 4. What...

But what is the R, and what is the c? thanks.

Homework Statement I made a word doc, and attached it as a picture. Homework Equations The Attempt at a Solution I calculated all the wavelengths, and plotted the values, but how do I find energy from the equation deltaE = hv? Thanks in advance!

That's the thing, I don't know if when I'm calculating the force acted by the gravity, which is W=mg, whether it should be a Positive or a Negative. I know how to do the calculations, I am just a little bit confused about the signs for W=mg. Thanks for replying so fast!

Homework Statement What are the magnitude and direction of the electric field that will balance the weight of an a)electron b)proton? Homework Equations W=mg E=F/q The Attempt at a Solution This is what I did: W=mg=F so E=mg/q My only question is, since W is downward, when...

Thank you all for the input! I think I will learn to memorize the circle with all the angles...I'm sure that will help.

Okay, thanks for all the input. Will try them again tomorrow morning. Need to get some rest! I'm sure I will dream about cal tonight...

Does this look okay?