It Was the Fork!

The only thing that the tube told us was that by increasing the length by .5m, we found the previous harmonic produced by the fork.  Since close tubes step by half-wavelengths, you can double the increase in L to get the wavelength (1.0 m)...yatta...yatta...yatta...  340 Hz.

Consider this post open to all last minute questions.  Hope I (and the rest of us) can help out.

Hack.

2008 Form B Free Response Scoring Guide

Sorry it's a bit late folks, but here's the scoring guidelines for the 2008 Form B test.

On a completely unrelated note, I hope that everyone had an opportunity to see the show last weekend.  It was unbelievable!

2008 Free Response (Form B)

So what's the mass?

A lot of you have jumped on my comment about friction.

Good for you.

Remember:  Friction always does negative work.  In fact, if an object rolls to a stop, then the amount of work done by friction against it is equal to the energy that it had at some point prior.

Also, since there are two objects involved in this collision, it may not be all that important that you acquire actual numbers as it may be the case that variables could drop out along the way.

Lastly, since we are talking about two different carts, you have considered that they might have different coefficients of friction, right?

And just so you don't feel so alone in this quest for mass, here's an article about the happenings at CERN and the quest to find the Higgs Boson!

Welcome Back!

Click on the link provided to get your very own copy of the 2011-2012 AP Physics B course syllabus! (If you happened to still have last year's copy, then you're pretty much good to go!)

Hack.

2011-2012 AP Physics Syllabus

Free Response #1 Solution

Here is my solution to the first free response problem.  You may disregard the final part as it is not included in this trimester's content.

Free Response #1 Solution

Problems 33, 34, & 35

Hey everyone!  Here are the solutions to the problems that we worked on in class. In addition to problems 33 and 34, 35 has also been worked out and is included.

Have a great weekend everyone!

Page 103:  33, 34, & 35

Then there was 5...

And in the spirit of our current unit, dealing with forces, I give you the top 5 within whom the Force was the strongest...

1. Anakin Skywalker / Darth Vader - Without Vader, there is no story.  Without the story, I'd need something else to obsess about.
2. Yoda - When you hear "Force," you think Yoda.  It's as simple as that.
3. Emperer Palpatine - Much like Yoda, he may not have flaunted it on a regular basis, but that guy knew how to bring the noise (and the lightning!)
4. Obi-Wan Kenobi - Obi-Wan may have been the only character to get a positive make-over from Ep's 1-3.  And along with Anakin/Vader, he plays a role in every film.  He also shows time and again that he's smarter than Anakin/Vader.  (Trivia fact:  Ewan MacGregor is the nephew of Denis Lawson, who plays "Wedge" in Eps 4-6.)
5. Luke Skywalker - Luke's actually quite horrible.  Bad acting, and a perfect 0-2 against anyone with even an iota of Force in their veins.  But the galaxy needs someone to be the right guy in the right place at the right time, and it's Luke.  Cleverly disguised, he's the Jar Jar Binks of the Original Trilogy.