June 2009 - Physics

Test Preparation SAT Subject Test Preparation
61

<p>exactly half would be in the realm of years, not seconds or minutes or hours or whatever the ^-3 would have it. hours is more accurate than years or hundreds of years.</p>

<p>EDIT:
For the compass one I left it blank because I don’t know what a compass measures, the field lines or the V or the F? If you think about it, there may be a Force pishing the arrow in that direction thats just countered by the force keeping the needle in place, or it could be like a velocity thats being countered by a normal force, you know?</p>

<p>So i left it blank but if i didnt i would have picked the wire cuz its obvious.</p>

62

<p>the change in direction occurs when the thing crosses X-axis, right?
I put that one as the answer…</p>

<p>and the one that couldn’t have been possible with the constant net force was the one in which the graph was a upside down V-shape?</p>

63

<p>and was “incidence angle” one of the answers? I forgot the question…</p>

<p>ps. are we allowed to discuss this soon?
I thought there was a 48-hrs rule.</p>

64

<p>But for the half-life one, I remember reading that the mummy was around 5000 years old and the scientists wanted to know the exact number. That’s why I thought 5 x 10^3 would be too general :/</p>

65

<p>What was the answer to the error question? Something like +/- .3 and +/- .2</p>

66

<p>+/- .6 easiest problem lol</p>

67

<p>I put +/- .5…physics really owned me.</p>

68

<p>Was it asking about addition or multiplication?</p>

69

<p>it asked for addition.</p>

70

<p>It’s +/- .5</p>

<p>It was talking about resistors in series, one with error of +/- .2 and one with +/- .3 Since you simply add resistors in series, +/- .5 is the answer.</p>

71

<p>Good, I had +/- .5 as well.</p>

72

<p>■■■■!!! i better have put that
what a careless error! omg omg omg</p>

73

<p>S*** I don’t think I put ±.5 </p>

<p>does anyone remember the exact problem?</p>

74

<p>if you guys don’t mind me saying this, carbon-14’s half life is approximately 5700 years, and it is used as a basis for most of living organisms.</p>

75

<p>What was the second part (on the first page)…I can’t seem to remember the quesiton exactly…oh yeah, the spring and points X,Y,Z–CAN SOMEONE PLEASE PLEASE PLEASE go over that? And qusaras? and i said particle accelerator in electron microscope—correct? And what was false with bohr’s model? and i think it asked one historical physics question–can any1 remmeber that or am i crazy?</p>

<p>and who wants to compile a list! (not me haha)</p>

76

<p>I have a few questions.
First, the question about photon and frequency. When the energy of frequency 5 hits it, does the particle have any kinetic energy. ( you have to remember the diagram to answer this)
Second, the one choice that did not comply with the Bohrs model.
(I chose the concept of photon for the answer, as Bohr did not believe the existence of photon)
Third, the device used for electric microscope</p>

77

<p>ears. ok.

  1. acceleration never changed/ velocity changed direction
  2. qusaras answer was it has been around since the beginging of the galaxy (i got that wrong but thats the right answer)
  3. forgot
  4. forgot
    Fernando
  5. I think it was 6? You just had to see what corresponded with 5
  6. forgot the Bohrs question
  7. magnets</p>
78

<p>Thank you SO MUCH!
and wow, i got them right…i am pleasantly surprised</p>

79

<p>are u sure device wasn’t particle accelerator?</p>

80

<p>yep.
had it checked with my dad as well at the end who is a physist.
i mean from what he understood it was a magnet and im pretty sure i explained the problem right to him. I could be wrong but im 98% sure</p>