<p>@ Keasbey Nights:</p>
<p>I say the answer is C. Since both the police car and the speeder are traveling at the same speed, the observed frequency would be the real frequency for the speeder only.</p>
<p>Is the answer to that question C? Both cars are moving in the same velocity, so there shouldn’t be a change in the frequency relative to the speeder.</p>
<p>EDIT: I’m a slow boy. -_-</p>
<p>Good job both of you, the answer is C.</p>
<p>hey you guys taking barrons or PR?</p>
<p>I’m using PR. It seems to be the best thing for Physics B around CC. </p>
<p>Pretty good as far as I’m concerned.</p>
<p>i’ve heard barron’s is better for physics B? or should i buy PR? ive not taken either yet</p>
<p>isnt there rotational motion in the syllabus- angular momentum conservation, etc… I didnt find any of them in the PR book</p>
<p>For physics B, the only rotational stuff is centripetal acceleration/force and torque applied to statics.</p>
<p>Bump. Three days for the exam! How’s prepping going guys? I’ll be posting some questions later today.</p>
<p>I’m going to read the whole PR on Friday and Saturday. Sunday is practice mc and fr.</p>
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<p>I’m still not getting this question… I know that jerrry445 tried to explain it but I don’t think I’ve ever seen that formula he uses…can anyone explain again for me? lol sorry I’m slow >.<</p>
<p>That equation is the standard equation of finding a magnetic field created by a current-carrying wire; the permeability of free space divided by 2pi, all multiplied by I (current) over r (distance from wire to a point). You can find that equation in the free response formulas sheet. </p>
<p>By that equation, you can see that r and B are inversely proportional. If we decrease the wire by a factor of 2 (4 cm to 2 cm), then B increases by a factor of 2 (i.e. two times stronger), which is why the answer is A.</p>
<p>Ohhh yeahh, I completely forgot about that formula haha THANK YOU! :)</p>
<p>isn’t there Ampere’s Law in physics B? that explains the whole thing pretty easily…</p>
<p>Ampere’s Law is not in the Physics B curriculum. It’s only in the Physics C curriculum.</p>
<p>Hey guys, I found something that I thought I would share with you:
<a href=“http://hrsbstaff.ednet.ns.ca/max/AP%20Documents/Updated%20B%20Index.doc[/url]”>http://hrsbstaff.ednet.ns.ca/max/AP%20Documents/Updated%20B%20Index.doc</a>
It’s basically an index of free response questions, so if you want any practice on a specific topic, you can look through the document to find a question with it’s number, year, and form. Hope it helps!</p>
<p>^ thanks, that’s what I needed…</p>
<p>what do you guys advice for me to do to practice for this exam??</p>
<p>i just want to pass. my teacher is completely incompetent and a horrible teacher in general. the last thing we covered was capacitance and i use the term “covered” VERY lightly.</p>
<p>please say there is some miracle thing i can do to pass this exam (:</p>
<p>I’m in a similar situation… My teacher was horrible and I didn’t learn jack… sooo I’m going to try to cram PR this weekend and hope for a 3… I REALLY don’t want to get a 1 or a 2…</p>