<p>Yeah I put that, and I also put one of the other options.</p>
<p>For the ellipse the options if i recall correctly were I) time taken for both arcs is same (true)
II) greater speed for longer arc (true) III) greater kinetic energy for the arc closer to the Sun (true) … I can’t remember though … correct me if I’m wrong!</p>
<p>@ahmed, one of the options was area, not speed. Also, why is the time taken for both arcs the same? I did that question really quickly without much time.</p>
<p>I’m not sure either… dammit</p>
<p>The third option was gravitational force is the same which is false</p>
<p>I’m pretty sure I only is correct for the ellipse.</p>
<p>@cha </p>
<p>I feel ya. Im in ap right now as well. Barely covered electricity, magnetism, waves. Only went through mechanics Also didnt have enough time to study.</p>
<p>ANYONE remember the matching questions in the beginning?</p>
<p>^ Acceleration always pointing down. Velocity was 0 at the top. Velocity was positive on the way up and negative on the way down.</p>
<p>anyone else with matching in the beginning? there was the one with polarization, refraction, etc
and there was the one with thermal stuff</p>
<p>for the ellipse 1 is definitely right because it is keplers first law. I think the one closer to the sun has a greater kinetic energy since the gravitational force is greater causing it to accelerate faster?</p>
<p>@eagles, yes I put that. I knew there were 2 answers!</p>
<p>Also, does anyone remember the matching for thermodynamics? Is entropy the reason it goes from warm to cold?</p>
<p>@Sid @ Eagles
Yea, I also put greater kinetic energy because it’s closer, and also choice I. I just thought the kinetic energy was for a different problem.</p>
<p>for the one that said the two metals bend, I put that it’s because different objects have different specific heat or something</p>
<p>@koreanme, I don’t think it was specific heat, but the word was something else.</p>
<p>Starting a list:</p>
<ol>
<li>15 < T < 20</li>
<li>Greater than 0.6c less than c</li>
<li>Two different metals bend because of different specific heat</li>
<li>It was traveling in a circle.</li>
<li>The last one: I and III only. I was true - Kepler’s laws state that two lines drawn from a planet to the sun sweep out equal areas. II was false - the farther away planet does not have a greater velocity; L=mvr and if r is increased v goes down. III was true - the kinetic energy of the closer planet was greater; a greater velocity KE = 0.5MV^2 is therefore greater.</li>
<li>Electrons Ionize in air.</li>
<li>Ball at the beginning of being thrown upward: velocity upward, acceleration downward.</li>
<li>Ball at the top of the path: velocity zero, acceleration downward.</li>
<li>Ball at the end of being thrown: velocity downward, acceleration downward.</li>
<li>Ohm’s law.</li>
<li>Work is not a vector.</li>
<li>Snell did not have to do with Thermo-goddamnits.</li>
<li>Changing the radius from 0.025 to 0.1 made the centripetal force [(1/4)F] as great.</li>
<li> Rutherford, small, massive positively charged nucleus.</li>
<li>Same size inverted.</li>
<li>Momentum always changes (anyone remember this?)</li>
<li>The force was like 2 * 10^-7.</li>
<li>The electric force went from like 4 * 10^4 to 1 * 10^4</li>
<li>Faraday’s law was Teslas * meters^2 / second</li>
<li>Light bulb was out</li>
<li>Light bulb went slowly brighter then stayed bright (might be wrong need explanation)</li>
<li>The distance went to 0.5m instead of 2 m. </li>
<li>Ff was 18? I forget exactly something like 36=FfMu</li>
<li>Mu → 1/6</li>
<li>What was the lightning question?</li>
<li>The table with distances and times - two questions anyone remember?</li>
<li>The table with distances and times - two questions anyone remember?</li>
<li>The first resistor got the most current.</li>
<li>The metal plate looked like a resistor. </li>
<li>Calculating force of North and South thing was zero → F = qvBSin(theta) → Sin(180) = 0.</li>
<li>The impulse question where mv = FdeltaT → I forget the answer. </li>
<li>The 2M block compressed the spring 2x.</li>
<li>The sheet bolted onto the table → harmonic motion. </li>
<li>The planets with radius 2r and mass 2M and stuff – > both choice E. The force is greatest when it was 2M and r and the kinetic energy → KE = msqroot(GM/r) is biggest.</li>
<li>Efficiency was 60%?</li>
</ol>
<p>i put 40% efficiency</p>
<p>@justPhysics the list looks good for the most part.</p>
<ol>
<li>im pretty sure was coefficients of thermal expansion?</li>
<li>Don’t remember the last one worded like that. I KNOW 3 is wrong cause it says something like the gravitrational forces are the same.</li>
<li>Its said electrons CANNOT ionize air. I think it was “cause interference”.</li>
<li>Yes it was “momentum always changes”. KE and speed are scalar and velocity is constant in centripetal force, but momentum is a vector and speed or direction must always be changing.</li>
<li>Yes it was 18. Fd=K, d=2 and K=36, so 36/2=18.</li>
<li>It was the one with the tornado and i think i put 34 but i honestly had no idea haha</li>
<li>The average speed was 10.37 (approx.) for the 3rd second, and a=1.3 m/s2 (i think?)</li>
<li>Efficiency was actually 40%. the heat absorbed was 500k, and the heat EXHAUSTED was 300k. (500-300)/500 * 100% = 40%</li>
</ol>
<ol>
<li>For the standing wave problem i put the straight one, but i think it was probably one of waves w/ different amplitudes.</li>
<li>Objects cannot approach c because of infinite energy.</li>
<li>For one of the last ones, the electric force on the point outside is greatest when the curve is sharpest. it was the one farthest right i think.</li>
<li>The sound wave vs. light wave one, i think it was the frequency of the light was greater because wavelength was the same and speed of sound is less than c</li>
<li>The electric lines one: Q1 is opposite and greater than Q2</li>
</ol>
<p>also what the heck were the answers for the 2 experiments??? One about charges through a slit and another about decreasing the width of a single slit</p>