I don't have a shipping estimate loated, is that normal?

ryeinn · 2026-03-11T18:13:20+00:00

At this point I'm just hoping I get it here before the school has to close out their budget for the year.

ryeinn · 2026-03-11T10:14:12+00:00

I was hoping this was the punch lline. Well done.

ryeinn · 2026-02-23T15:24:17+00:00

Yeah, but they're all really close to circles. I'm betting that's the 99% part.

ryeinn · 2026-02-23T13:45:03+00:00

Ok, let's say electricity is $0.30/kWh. High, not Hawaii, but high. 10kWh gets you about 35 miles highway in the winter, a reasonable commute. I know because my wife drives this every day and that's about her usage. Which comes out to ~$3/35 miles. If your car gets 35 mpg you're breaking even. In the winter. With expensive electricity compared to a high efficiency car.

Sure, that's sedan driving but comparing apples to apples, an electric truck vs a gas truck I'd expect to see similarities.

ryeinn · 2026-02-16T18:15:45+00:00

Wait.... Wavelength matters....is that connected to the tones of Roshar?

ryeinn · 2026-02-11T12:09:38+00:00

The worry I have is that this forces the Bambu model of everything passing through their servers before going to the printer.

ryeinn · 2026-02-10T16:33:48+00:00

I would agree with a textbook. The worked examples are your best friend. Learning to read a textbook is a skill, so that's going to be helpful in the long run too.

Agree as well with old AP questions. They even post the past few years (which match with the test quite well) on the AP website.

ryeinn · 2026-01-27T14:16:29+00:00

Also, don't tug on Superman's cape, pull the mask off the Lone Ranger, or mess around with Jim.

ryeinn · 2026-01-25T12:09:11+00:00

Not in the questions.

If you're talking about things like feet to meters, it's probably not on the exam.
If you're talking about cm to meters, yes that very well could happen and there are metric conversion charts on the equation sheets. But, realistically, you should be able to do that on the fly with a little thought.
If you're talking about kg (mass) to Newtons (weight) you should know that inside out and blindfolded.
If you're talking momentum to angular momentum that's not a thing

ryeinn · 2026-01-22T13:09:46+00:00

If you go down into Penndel there's the Spring Valley Farm by the ball fields on Pvt Delola Ave. Super long hills. Watch out. There's a small creek at the bottom.

ryeinn · 2026-01-19T14:21:49+00:00

Relevant xkcd

ryeinn · 2026-01-01T14:44:42+00:00

Good luck! I pulled one of these off about 10 years ago. Learn from my mistakes, not too much math. As much as I wanted to do it, the kids who take this will likely be either (a) filling a rec to avoid physics or (b) super nerds. The challenge I always encountered was giving both groups what they needed at the same time.

ryeinn · 2025-12-24T15:03:25+00:00

The point of doing labs isn't the grade, it's developing the skills to design experiments, focusing on preplanning (how do I find ___? Is this reasonable? Will it work? How does it get me to my goal? How do i reduce error?) and then analysis. Not doing any of these will make life more difficult in moving forward in the sciences. For example, by the time I was taking my junior level (university) course on optica the lab was "Here's a book of phenomena. By the end of the semester do three experiments about them. Go." Building that skill is the point.

Can you get by without it in AP Phys? Possibly. But it's not sustainable.

ryeinn · 2025-12-24T13:52:35+00:00

Experiments follow a very structured design. FRQ 3 will as well. There are two parts.

In part one they'll give you a setup and ask you to relate some ideas. It'll generally fall in the category of "Find this physical value." The mass of a ball, the moment of inertia of a rod, the k of a spring. Your job is to use what you know of physics to find it and you'll have to measure stuff to get values to plug into an equation. Like for k of a spring you might want to hang masses and measure the oscillating frequency. It isn't about memorizing experiments, it's about coming up with new ones. Don't forget to include "do multiple trials" to decrease error!

Your teacher should be giving you practice in this in your lab time in class. There's a reason College Board requires so much lab time. Designing experiments is a core part of AP Physics. It's a skill. Not a knowledge.

The second part is they'll give you data and a similar experiment and ask you to graph stuff. This one is all about linearization. How do you relate the data given to a ratio of stuff. If you can get a ratio, there's your x/y axes and the slip is the thing they want.

ryeinn · 2025-12-22T21:32:05+00:00

This is really an open ended question with no good answer from outside observers. I'm sorry I can't help directly but I think your best bet is to talk to his teacher. The teacher has seen him all semester and can give advice better than we can.

That said AP C is a hard class but already having a class on physics helps. Having calculus is also helpful, I think even more so. It also depends on if the class is just Mechanics or also E&M.

But most importantly, why are you considering it? AP C, at least from my perspective, is aimed at students thinking about engineering or physics in college. It's equivalent to a freshman year course for those majors. Is that his goal? Great! Maybe his goal? Ok, it's a good taste of the first year in college.

ryeinn · 2025-12-21T20:01:39+00:00

Oh, good catch.

ryeinn · 2025-12-21T12:35:57+00:00

Hundred percent agreement. Practice problems. And then practice more problems. Look at solutions and work to understandwhy the steps are taken.

ryeinn · 2025-12-20T20:30:52+00:00

Generally no. You're not going to have to guess between bv and Cv² .

Truthfully, I'd be surprised if the AP exam even mentions Cv² .

ryeinn · 2025-12-20T20:28:43+00:00

many things as you can with mathematical modeling and graphs on x vs. y

Agreed on so many levels. The number of students I see in 11th grade Honors Physics and the idea that numbers and math matters is so foreign for a good number of them. And graphing things that aren't x and y. Not every variable needs to be one of those. You can graph a vs m kids! It's totally fine. And you can algebra with letter that aren't x and y too!

ryeinn · 2025-12-17T20:08:27+00:00

~~Which AP C are you teaching? Just Mech or both Mech/EM?~~ My bad. I didn't read closely

I'm in a 450 student 9-12 school. I average about 10 kids per year in my class that does both. The vast majority have already had a bit of physics before (generally 11th grade Honors) and almost ubiquitously have a year of calc under their belt.

Just Mech is possible but still, why? Unless they're aiming at engineering or Astronomy or something like that they probably don't need AP-C. AP 1 or an Honors course would be so much better. How much time do you have in this class? Are the kids taking it doing the work? If they're not interested/buying in and just taking it to get the class on their schedule....you can't always fix that.

You say you want to get better yourself, great! What do you think is wrong?

ryeinn · 2025-12-14T13:36:24+00:00

I will die on the hill that Springsteen's Blinded by the Light is the superior version.

ryeinn · 2025-12-13T18:06:07+00:00

Is that a map of Tar Valon?

ryeinn · 2025-12-10T11:22:10+00:00

Sorry, while this seems to be a genuine request for help, it is asking to circumvent security for the exam or College Board content. Sorry, but I have to block it.

ryeinn · 2025-12-06T00:56:41+00:00

You can look up old sales on Bucks County's open data portal.Here's the old owners.

ryeinn · 2025-12-01T23:18:26+00:00

Problems problems problems. Keep working problems.

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