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I'm having trouble visualizing this problem. If there is one mass, why are there two strings (apparently one of them an "upper" string)?

Have you tried this problem yourself?

Just to add to what ebaines said:

Finding the area of a polygon is not always difficult. If it's a regular polygon, it's often very simple. I believe much of ebaines' answer assumes you're...

zqueez:

Try adding up all three equations to form one big equation with 2A + 2B + 2C = ?? (whatever the number ends up being).

Then I would suggest trying to solve for A + B + C and asking...

Didn't someone already post this exact problem?

Have you thought about a pet?

My husband is going through a very stressful time at work, and playing with our dog really helps him relax after a long day. I've heard that petting a dog or a cat...

Uh, did you just do this student's homework for her? I'm new here, but I'm not sure that's the point.

Actually, whether we can see to the center of the galaxy depends on what wavelength we're looking at. I agree that we can't "see" the galactic center if you are talking about optical light. But it's...

I don't like online translators like reverso or babelfish.

For looking up vocab I find WordReference.com is a great resource, and they also have a forum where you can ask questions about...

It would probably make us more susceptible to a runaway greenhouse effect like that on Venus. But I doubt it would affect the other planets that much; the Sun is far and away the dominant player in...

I'm thinking that the Mean Value Theorem implies that for any given velocity curve, there will be at least one point where the instantaneous velocity equals the average velocity. But the actual time...

Hi,

The metal stair rails on our concrete front porch recently broke and we had to remove them.

I would very much prefer to replace them with wood rails, which I think are far more attractive....

Capuchin, are you saying you can't just use the center of gravity to calculate the effective mass at his hands and feet, and then use Newton's third law? It seems like you should get the same...

Agreed -- and you can shorten the amount of repetitive work you have to do by calculating the volume of 1 mol of a gas at STP. The number you get is the volume per mol of any gas that's at STP -- so...

Hmm, I'm not sure I agree with that. I think of a law as a Theory that has been in place for so long that it's acceptable to call it "proven." I think it would be acceptable to talk about Newton's...

I'm thinking you posted this in the wrong section.

It may help you to think of the polyatomic ions as a single group, so that in the last equation, you think of each NO3 as one unit instead of one...

That's what I figured! I'm a bit of a stickler so I had to point it out -- I'm always trying to convey to my students the difference between a scientific Theory and the popular idea of theory, e.g....

Did you mean \sin \alpha = 1/12? There's no angle in the first one, and I'm going to assume you meant \sin\alpha.

Do you have trig identities for the sum and difference of angles? e.g....

However, it's not "just a theory" in the sense that Evolution or Relativity are theories -- which they both are, and both have stood the test of time after making many detailed (now confirmed)...

This sounds like a homework problem in optics with a concave and a convex lens of the same r and in the same position with respect to the original object.

jenan41, have you tried the problem?

Not being an expert, I can't tell if this is sarcasm.

True, but is that because it's outside the habitable zone or because its runaway greenhouse effect has made it uninhabitable?

I would have to double-check, but I believe that Venus is just on the...

Try Atomic Theory near the bottom of the page.

Well, I looked all around for a drip leg and I didn't see any capped pipe. Is it possible that I don't have a drip loop?

I called my plumber and explained the symptoms, and he said that it was...

Inverse functions are symmetric about the line y=x, true.

That means that you can find the inverse function by swapping the x and y variables.

So if you have f(x) = x^2 - 8x -4, you can write...

Agreed. A quadratic function always has two roots. They can be real or complex. If you're looking at a graph, the real roots are where the graph crosses the x-axis. If the graph never crosses the...

Give yourself time for your libido to come back after going off depo. Depo killed my sex drive -- by which I mean, I never wanted to have sex for various reasons -- and after I went off it, it took...

I'm not a medical practitioner of any kind... just someone who was on depo for about 4 years.

I had none of the side effects with depo that I had with the pill -- it seemed like it was just a...

Hi,

My water heater's pilot light keeps going out. When I re-light it, the thermal couple is in the flame (which is blue), and after I release the valve, the light stays on. Then, if I turn the...