<p>I hope that there’s a lenient curve but based on reasons from other part threads for physics I don’t think that the curve for this test will be much better :(</p>
<p>and @jansatomg</p>
<p>playing with this is confirming miami (which means i got the question wrong sigh)</p>
<p>[Faradays</a> law moving magnet](<a href=“http://www.livephysics.com/simulations/electricity-magnetism-sim/faradays-law-moving-magnet/]Faradays”>Faradays law moving magnet)</p>
<p>Some others I remember:
Reason why a bell sound gets softer – damping
A circuit with a 1ohm, 2ohm, and 3ohm resistor and emf of 12V, asking for the current in the 2ohm resistor – 2A
M vs 2M blocks as pendulums – 2M one had twice as much PE, both had the same speed at the bottom
Inclined plane – 105J of KE at the bottom
Inverse square relationships – gravity and light intensity
Methods of heat transfer – radiation, conduction, and convection
Two atoms in a box with a 4eV absorption – one goes up to 4eV, other is in ground state
Doubling period of pendulum – quadruple pendulum length
Automobile engine – work = heat
Relativity (rocket at .5c) – would seem like more time? longer ship?
Does anyone agree or disagree with these?</p>
<p>For the automobile engine I didn’t think that work has to = heat released. Wouldn’t that mean that all engines have to run at 50% efficiency? I put heat has to be released into atmosphere because the entropy of a system generally goes up according to the laws. I wasn’t sure though so I may be wrong.</p>
<p>Kmb: for the 4eV prob I dont think there that was one of the choices. There was a choice that had each atom increasing by 2ev.</p>
<p>also did the problem ask if we wanted to double the period of pendulum or just increase?</p>
<p>HatersGonnaHate: Yeah I agree with your response.
LANGWANG37: Err no there was a choice with one atom at 4 eV and another at 0 eV. This is the right one. You can’t fill them up 2 eV and 2 eV. That’s absurd!</p>
<p>@kmb987 for the atom one why it couldnt be 1 at 4ev, the other one at 2ev?
Also, would you please tell me more about the pendulum one and the engine one? I forgot the details</p>
<p>@langwang yeah i thought it was just increase too!</p>
<p>I skipped 4, and 6 were possibly incorrect, what’s usually the curve on this? Also, what bout the ship moving past at .5c, same length, longer time?</p>
<p>Hm was it increase? I thought I remembered something about quadrupling. I sort of guessed on the atom one, but I think the other one couldn’t be at 2eV because the energy was already absorbed in the other atom. I’m not sure of the details of the automobile one but I thought the pendulum one said “Which of the following would double the period of the pendulum?” and my answer was quadrupling the length.</p>
<p>For the rocket problem, I think time is longer, but length is ‘shorter.’ Time dilation and length contraction… (theory of relativity)</p>
<p>@saminator i said shorter length, longer time (though potentially if the length were perpendicular to the motion the length would be the same… but i think the length is in the same dir as the motion)</p>
<p>@jansatomg it definitely can’t be that because you only add 4eV so by conservation of energy wherever the two end up has to add up to 4eV.</p>
<p>@wlsnehf yeah I think you’re right, I just looked it up…we never covered relativity in class which is sort of annoying</p>
<p>There was also one about the laws of thermodynamics-- i don’t remember the exact question but I know I wasn’t sure about it. I think I put something like “the engine must release heat to the atmosphere” but it was almost a complete guess…</p>
<p>Solipsisme: I agree. Conservation of Work-Energy, right? Or, equivalently, First Law of Thermodynamics?
Wheeeee it’s always awesome when people agree on answers.</p>
<p>^solipsisme Thank you! Well… Sorry that I understood the question completely wrong. Didn’t learn those stuff well either.</p>
<p>^kmb987 I don’t remember double the period… I remember one that related to the period and pendulum… Totally forget.</p>
<p>does work = qV ?</p>
<p>With respect to the 4eV question, I put the answer as the one which excites only one of the electrons to 2 eV. Now the reason I put this is because it takes <em>work</em> to liberate the electron.</p>
<p>Goddamn it…i got the kinetic energy one wrong!</p>
<p>Saminator910: Yeah, work = qV. It was the only answer there that was dimensionally correct anyways.
APushed96: What kinetic energy one?</p>
<p>@saminator you sure there was an option for shorter length longer time? I would have picked that one but I only saw same length longer time. Hope I didn’t make that stupid of a mistake lol</p>