<p>and was the wave that was not possible a rightside up hump and then right next to it an upside down hump? and did the pump for the heat engine give 110J of heat to the house or 0J of heat to the house?</p>
<p>What was the exact question for the heat engine? I know there was this kind of setup:</p>
<pre><code> House
I
</code></pre>
<p>(pump)–
I
Heat sink or something</p>
<p>blackroses,</p>
<p>yup, we all seem to have done pretty well! :)</p>
<p>yeah and then it asked how much heat does the pump give to the house, i just added up 50 and 60J to get 110J, but i was wondering if that’s what others got. and is that wave what peole got too?</p>
<p>Oh and another question was</p>
<p>What did Millikan’s oil drop experiment measure?</p>
<p>I think it was the charge of an electron.</p>
<p>There were two similar answers this, one was “measured the charge of the electron” and the other was “said that there are neg. charged particles called electrons hovering around the nucleus”</p>
<p>haha i just left that one blank, had no idea.</p>
<p>what did u guys say for the question about two falls with uniform density foams?</p>
<p>i said “mass to surface ratio for the bigger ball is greater”</p>
<p>Ooh yeah I said that too.</p>
<p>Another choice that was the last one i crossed off was “the buoyant force of the air was greater for the smaller styrofoam ball”</p>
<p>i put something to do with buouncy</p>
<p>i said bigger ball falls quicker bc it has a greater mass and therefore earth has a greater gravitational pull for this object as opposed to the one with less mass</p>
<p>was that even one of the answers?</p>
<p>haha i’m so sorry to ask again guys but was the only not possible wave the one full wavelength one. and was the heat 110J? sorry again guys</p>
<p>The one having to do with mass is wrong; one of the fundamentals of gravity is that the acceleration due to gravity is independent of an objects mass.</p>
<p>Proven by:</p>
<p>F = GmM/r^2</p>
<p>ma = GmM/r^2</p>
<p>cross out m</p>
<p>a = GM/r^2</p>
<p>As for the buoyant force one, I have no idea… surface area I know has to do with air resistance so i put the mass:surface area option but I didn’t know for sure…</p>
<p>Man, on this test I could get anywhere between 650 and 800, I really have no clue…</p>
<p>and the weight of the man with 2 times the radius, should be W/4 right?</p>
<p>ashyda, i know.</p>
<p>the first two choices were just wrong because mass is independent of both Fg and g.
i thought the buoyancy was wrong so i went for the ratio (surface thing). just as you said, i thought it had to something to do with air resistance :)</p>
<p>For the heat engine, I just added the heats as well, but I don’t know if that was right.</p>
<p>For the man I’m really not sure, but I know that the force of gravity a mass exerts increases as its mass increases…OH!!!</p>
<p>you’re right, it must be 1/4 times his weight.</p>
<p>got that one wrong, shoot.</p>
<p>for the standing wave one…honestly I don’t remember anymore…</p>
<p>i found this somewhere: Air resistance is determined by surface area and shape.</p>
<p>i think the balls had the same size (uniform density?) but the masses were different…</p>
<p>haha and you would think the standing wave one was an easy question but it gave me the most problems…does anybody have an answer to this one??</p>
<p>you mean the one that asked for the incorrect one?</p>
<p>i chose the one that had 2 bumps</p>
<p>yeah a upright one and upside down one next to each other?</p>