<p>@willypot</p>
<p>For the first question, I said that there was no area in which you could see no light. For the second, I think it was area 6 only.</p>
<p>@ambitious, yes I got those answers, but I highly doubt those were correct. That was my most reasonable conclusion solely based on the diagram (no physics used).</p>
<p>@ambitious @Siddysidsid</p>
<p>I don’t even remember 6 being an option for the second wow.</p>
<p>@Siddy I hope you’re right (:</p>
<p>What did you say for the wall question with the changes in temperature? I said the one with 9 area, .2 thickness, and 17 degrees inside. I think it was choice E.</p>
<p>@Siddy I used solely logic also, but those answers were the only ones that made sense.</p>
<p>@ambitious, yeah i got that as my answer because it had the lowest value for q initially.</p>
<p>what was the answer for the speed of the car on the track that had a loop with a r radius. and if you increased the initial height of the car, the speed would be…??? Help!</p>
<p>@studytogo I put the speed increases and then the question after i put Root 2v</p>
<p>oh okay i got the first one as increases too. but why is the second one root 2v? isnt it just 2v?</p>
<p>@study @williy I said sqrt(2)v also. I wasn’t really sure why but I thought it might have something to do with mv^2/r.</p>
<p>I thought it was hard. I omitted 5 and got two wrong. I hope there will be a huge curve. </p>
<p>I got sqrt(2v) as well. </p>
<p>The last question was 8000kg * m/s^2
I think the rope one was speed decreases and I KNOW the wavelength does not change. According to Giancoli: "Consider next a pulse that travels down a rope which consists of a light section and a heavy section. When the wave pulse reaches the boundary between the two sections, part of the pulse is reflected and part is transmitted. The heavier the second section of rope, the less the energy that is transmitted. For a periodic wave, the frequency of the transmitted wave does not change across the boundary because the boundary point oscillates at that frequency. Thus if the transmitted wave has a lower speed, its wavelength is also short. "</p>
<p>I missed the A vs. B^2 question :/</p>
<p>Also the question that asked which thing had the units kg * m/s was momentum.</p>
<p>The question that asked which of the following EXCEPT could be zero if an object has a constant acceleration was force. </p>
<p>Did anyone get 80m/s for the other wave question?</p>
<p>I’m taking the test next Sunday (I’m from Israel). Do you think it’s going to be as hard as this one?
How accurate are sparknotes practice tests?</p>
<p>@just Yes, it was 80.</p>
<p>Was A vs. B^2 the right answer?</p>
<p>why was the last question 8000. I put 12000 because the final acceleration was 2m/s^2 meaning that ma=2000, while the weight of the block was 10000 so x-10000=2000 x=12000.
And when waves enter a denser medium wavelengths change and speed decreases. Frequency stays constant.
[What</a> is effect on wavelength of light when it enter dense medium](<a href=“Answers - The Most Trusted Place for Answering Life's Questions”>What is effect on wavelength of light when it enter dense medium? - Answers)</p>
<p>@ambitious2 </p>
<p>I think so. Any other questions that people can remember? </p>
<p>One asking about energy was mc^2.</p>
<p>The one about the orangle light/green light/photoelectric effect was II only. Only the kinetic energy of the particles increases. </p>
<p>The rider had work/potential energy of (5)(10)(5) = 250 J. </p>
<p>The rider had the greatest velocity on the way up at point 1 or whatever. </p>
<p>What about that person hearing lightning? Was it just x = vt and something like 3000m?</p>
<p>@Willypot</p>
<p>You probably messed up the signs. Well set downward as positive.</p>
<p>-Fn + mg = ma —> mg = ma + Fn —> Fn = mg - ma —>
Fn = m(g - a) —> Fn = 1000(10 - 2) —> Fn = 1000(8) —>
Fn = 8000 N</p>
<p>What was the last question about?</p>
<p>@williy</p>
<p>I think it is 8000. I always see the tension as the difference between how much something wanted to accelerate and how much it actually did. That is why I put 10,000 (weight) - 2,000 (actual) = 8,000</p>
<p>The weight of a person descending elevator.</p>
<p>Also did anyone else get the efficiency of 0.6?</p>
<p>Also, when the amplitude of a spring is changed the period stays the same.</p>
<p>@just Yes, I got 0.6. I also said the period stays the same, which I am pretty confident about.</p>