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05-09-2008, 08:13 PM
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#16 | | Senior Member
Join Date: Jun 2007 Gender: Male
Threads: 42
Posts: 2,455
| =D But really, if the test was that easy I would totally get a 5 =[ | 
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05-09-2008, 08:17 PM
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#17 | | Junior Member
Join Date: Dec 2007
Threads: 46
Posts: 276
| ^dude, I took the B test last year, and it was a "JOKE" no joke...I had never ever covered ANY OPTICS OR MODERN STUFF and I still pwned the test...relax, just make sure you know Electricity & Magnetism and Mechanics very well, and a 5 is almost guaranteed  | |
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05-09-2008, 08:40 PM
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#18 | | Senior Member
Join Date: Jun 2007 Gender: Male
Threads: 42
Posts: 2,455
| Well I know like all the formulas and stuff but the concepts behind them...meh not so much.
My teacher showed us the MC and FRQ's from like 88, 93, 98 etc and they were so hard dude. I had no idea how to do like any of that stuff.. =/ And even though I know the formulas deriving some of those random formulas they ask for is confusing for me for some reason.
I dunno I've never had a physics class before this one and my teacher didn't teach us at all. So everything I know is like self studied =/ | |
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05-09-2008, 09:35 PM
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#19 | | Member
Join Date: Apr 2006
Threads: 37
Posts: 557
| I thought the 98 MC was pretty easy (I have yet to do the others). Some of the computations were tricky but it's mostly understanding the physics situation involved (which requires a bit of good reasoning) and then formula manipulation. | |
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05-09-2008, 09:48 PM
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#20 | | Senior Member
Join Date: Jun 2007 Gender: Male
Threads: 42
Posts: 2,455
| ^ Yeah, which is why I'm screwed =[ | |
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05-09-2008, 09:53 PM
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#21 | | Member
Join Date: Feb 2007 Location: middle of nowhere, CA (soon to be UCSD (Revelle)!) Gender: Male
Threads: 57
Posts: 501
| crap i can't even study for AP Physics! Stupid English project!! | |
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05-09-2008, 09:57 PM
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#22 | | Member
Join Date: Apr 2006
Threads: 37
Posts: 557
| llpitch I suggest you review kinematics, dynamics (esp. circular motion and how it sets up a generalization of acceleration), and work/energy again. Knowing these three topics extremely well will improve your physics intuition by A LOT. | |
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05-09-2008, 10:01 PM
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#23 | | Junior Member
Join Date: May 2007
Threads: 21
Posts: 253
| Phys C question:
A very small, solid, spherical ball starts to roll without slipping down a ramp from rest. If the ramp is 10 meters tall and no energy is lost from the ball to heat, find the speed of the ball when it leaves the ramp. (assume g = 10m/s^2).
A) 10m/s
B) 11.952m/s
C) 14.142m/s
D) 15.811m/s
E) 20m/s | |
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05-09-2008, 10:05 PM
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#24 | | Member
Join Date: Feb 2007 Location: middle of nowhere, CA (soon to be UCSD (Revelle)!) Gender: Male
Threads: 57
Posts: 501
| new AP Physics B chat room: ApPhysics | |
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05-09-2008, 10:11 PM
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#25 | | New Member
Join Date: May 2008
Threads: 3
Posts: 12
| yatta, it's C.
the question basically tells you a ball rolls down a ramp without friction. thus it's a conservation of energy type question.
energy at top (gravitational) = energy at bottom (kinetic)
mass*gravity*height=(1/2)*(mass)*(velocity squared) [masses cancel]
10*10=(1/2)(velocity squared)
sqrt(200)=velocity [about 14.142 m/s]
i hope the B this year is easy, i'm learning optics, nuclear physics, and fluids this weekend yay | |
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05-09-2008, 10:12 PM
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#26 | | Member
Join Date: Apr 2006
Threads: 37
Posts: 557
| Conservation of energy => v = (2gh)^(1/2) = (2*10*10)^(1/2) ~ 14 | |
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05-09-2008, 10:21 PM
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#27 | | New Member
Join Date: Jun 2006 Location: atlanta, ga
Threads: 10
Posts: 24
| Anyone have the 2004 physics b mc/answers they might be willing to send me? That'd be awesome. | |
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05-09-2008, 11:01 PM
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#28 | | Junior Member
Join Date: Oct 2007
Threads: 20
Posts: 122
| so if the ball is rolling without sliding is that no rotational kinetic energy??? | |
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05-09-2008, 11:01 PM
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#29 | | Junior Member
Join Date: May 2007
Threads: 21
Posts: 253
| The ball is rolling without slipping so there is rotational KE. | |
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05-10-2008, 01:12 AM
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#30 | | Junior Member
Join Date: Oct 2007
Threads: 20
Posts: 122
| then how is it 1/2 mv squared equal mgh....isn't it 1/2Iwsquared equal mgh? | |
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