swansont

I'll echo what Tom Mattson said - generally you do the algebra/trig/precalc in high school. Specifics will depend on the college to which you go, but I would expect their calculus classes to have a prerequisite of some precalculus class, satisfied by either a high school course or a college course. If you take it in college, it might be considered a "remedial" class and not count toward credits for e.g. a minor/major in math.

I've heard of companies that wouldn't hire physics PhDs because of the concern that they wouldn't have a business focus. But it's not universal. Plenty of academic types go off and work for or even start up companies.

Assuming you get into college, there is nothing you have to do right now. But in college, majoring in physics will require claculus and then differential equations, which requires algebra as a prerequisite.

In many, but not all, cases. That's what I meant by "more interesting work." It's certainly the case that the jobs I've held would not have been open to someone with a lesser degree. However, you do run the risk of being overqualified for some jobs, where they would rather hire someone who is less-credentialed (presumably so they can pay them less). There are also concerns in business over hiring types who are "too academic-oriented." The model of getting a product to production is often incompatible with the curiosity of discovery. But it all depends on the circumstances of the jobs.

Because, as we know, storage methods never become obsolete. All my data are on 8-track cassettes and vinyl discs.

We can't because work is defined as it is' date=' and momentum is defined as it is. I already gave an expression for KE and momentum. You can't easily relate it to a change in momentum because KE depends on p[sup']2[/sup], so it depends on how much momntum you have to start with.

Tokomak, also tokamak. It's fusion reactor. Google is your friend.

EM radiation doesn't make a shock wave, since it doesn't use the air as a propagation medium.

In physics it's generally four to twelve years of working long hours as an indentured servant. If you are starting from a Bachelor's degree, it's a few years of classes and then life in the lab (if it's experimental) or on the computer (if it's theoretical), doing your thesis advisor's bidding. It takes a mix of intelligence and stubbornness. The payoff is not necessarily a higher salary, but the opportunity to work on more interesting projects. My degree took six years, which was the average for physics in the US at the time. I think it's gone up since then.

Newton's law tells you the cooling rate - how fast the temperature changes. Fourier's law tells you heat transfer rate, which is how fast the energy is transferred. The link between them is the heat capacity, which tells you how much energy a material can store for a given change in temperature.

You can. Work is change in kinetic energy (if there is no potental energy change), and KE = p2/2m

Then JC was correct; the tension will increase down the cord.

JC is assuming the string has a non-negligible mass. But since it's not given, let's approximate it as zero. The mass m feels a force mg down, and yet it's not accelerating. What's holding it up?

Do you have an equation that relates the wave properties to the tension in the string? and you had to bump the thread because nobody answered it in 45 minutes?

Glue is generally made of stuff that has no noticable magnetic properties.

Instead of getting the normal spread-out pattern of the field, it all goes into the metal. Thus the region above is shielded. A little like a magnetic "sponge" It would look very much like Rebel's first diagram, but the field would be stronger in the material, since you have concentrated it.

Right. Spin 1/2 can have a projection of +1/2 or -1/2.

Having a 4.5 billion year half-life helps, too, vs 24 kyears. Five orders of magnitude less activity right out of the gate.

That's only the center-of-mass atomic/molecular motion. Atoms reaching sub-nanoKelvin temperatures show no signs of changes to their electron structure.

Speaking of which, as this is Valentine's day, it is the 23rd anniversary of the monopole event at Stanford (1982, Cabrera)

Maxwell's equations were well in place before Einstein came up with relativity. There is no velocity addition explicitly in them - it's a set of equations describing the electric and magnetic fields. It was noticed, after the fact, that the speed of light was the wave speed in the equations, dependent on the permittivity and permeability.

My guess was that the metal pieces are [math]\mu[/math]metal, which is metal that has a high magnetic permeability and is used for magnetic shielding. That would explain the lack of a field in the case of one piece - all of the field above the magnet goes through the metal. But I can't see how adding a second piece would give you the field back, so I'm not convinced that this is the case.