October 2010 - Physics

Test Preparation SAT Subject Test Preparation
141

<p>hi guys,</p>

<p>can you please list all you have.?</p>

<p>i have some as well.</p>

<p>1-last question;1.000 kg,2 acceleration down and what is the tension?i guess answer is 10.000-2.000=8000</p>

<p>2-which one is greater for blue light compare to (i don’t know but one which has less frequency),then answer is frequency</p>

<p>3-5 kg,bell,5 metre then what is the joule? it is 5.10.5=250 joule</p>

<p>4-which one is correct for impulse?it is equal to change in momentum.</p>

<p>I wrote down some,I’ll add them</p>

142

<ul>
<li>a pulley with two end attached to two block. one end is pulled by the static friction, one end is pulled by the gravitational force. answer: tension force= gravitational force= static friction</li>
</ul>

143

<p>then,answer is 8 N,right?</p>

144

<p>there were 2 questios like that; what happens to x? 1- x is displacement 2- x is period(I am not sure).do u know answer of these questions?</p>

145

<p>there was a road which has radius of r and velocity of v.if radius becomes 2r,what is gonna happen to v? I gues route of v</p>

146

<p>Please post the full list as it exists so far.</p>

<p>There was one question about light and sound waves diffracting around an open doorway or something. I omitted it.</p>

<p>The 28-question list has two different answers for the capacitator problem, unless there were two and I only remember one. The question asked about the amount of charge left in a capacitator as it discharged, not as it charged. They discharge in an exponential decay function according to a google search, not in a negative linear function.</p>

147

<p>Not sure if this was mentioned already or not, there was one where the electric field was pointing into the page and there were 3 scenarios with a wire spinning around an axis and you had to choose which ones would induce an emf…?</p>

148

<p>^ I think someone said that it was I and II because the third one was just rotating the square around </p>

<p>don’t think it’s confirmed though</p>

149

<p>^^You need change in flux to induce an EMF. Flux=BA cos theta. In the first two cases the angle between B and the normal to the coil would range from 0 to 360 i.e. flux would change.</p>

150

<p>1-last question;1.000 kg,2 acceleration down and what is the tension?i guess answer is 10.000-2.000=8000
i dont remember this question? What was it??</p>

<p>2-which one is greater for blue light compare to (i don’t know but one which has less frequency),then answer is frequency</p>

<p>3-5 kg,bell,5 metre then what is the joule? it is 5.10.5=250 joule
What was this question???</p>

<p>4-which one is correct for impulse?it is equal to change in momentum.</p>

151

<ol>
<li>what was the sum of the kinetic energy of the two carts?</li>
<li>Does everybody agree on quasar?
Can somebody confirm the 6 screens and light?
Can somebody confirm net force = 0 for moon and earth
Is it Current opposite magnetic field left?
Is it 1 m up for the rider when velocity is greatest?</li>
</ol>

152

<ol>
<li>agreed on quasar because im sure about all other options that they are stars at different stages.
dont remember any of the rest though.</li>
</ol>

153

<p>Sum of carts’ KE: 45 J</p>

<p>Rider: I put 1 m up. The bell makes a “very loud” sound so it’s hit with more than enough force to send it higher than 5 m (but it’s stopped by the bell), so TME > 5mg. On the way down TME = 5mg. Therefore KE up > KE down, so velocity up > velocity down. And velocity is greatest near the bottom in both cases.</p>

154

<p>So far…60/ 75 consolidated list that i made I have 7 omits and 15 potentially wrong :frowning: This test should have a generous curve or else…</p>

155

<p>can you please post that list timmycho?</p>

156

<p>ill do it later when i have all the questions we still have 15 to track down</p>

157

<p>I remember one question - a circular wheel rotating with a block on top of it, with a spring pulling the block mass, and the wall.</p>

<p>What does this experiment show?</p>

<p>I put kinetic friction</p>

158

<p>13 questions to go…oh please God I do not want to get more wrong</p>

159

<p>Can I ask - for the question about the moon, the earth, and there masses being in an 81:1 ratio…which point was it?</p>

<p>I can’t remember the letter i put, but i remember it was the second closest to the Moon - is that right?</p>

<p>Also, just remembered one - two capacitor plates, and a charge ‘q’ half way between them. I put (D)</p>

160

<p>for the two capacitor plates what was the question asking?</p>