<p>and yes definitely 0, it was constant velocity that was like Q 72-73 ish?</p>
<p>That was 25%</p>
<p>Yeah I got 90 I remember that now. I put 0 for airplane. The elevator was constant velo. Shoot. I thought it was constant accel. And I got 18 for the one you’re thinking of. So I think I put 36 hahaha</p>
<p>Yes, could someone state what the airplane question was?</p>
<p>Efficiency would be 200/600 = 1/3, wouldn’t it?
OH MY GOD.
Did they mean total was 800, so 200/800?!
I thought it meant that after 600 was absorbed, only 200 was used!</p>
<p>@Andy, I said 0 as well, it was for net force…</p>
<p>it’s moving at a constant velocity at level height… upward force is canceled by downward
and drag is canceled out to… *since its at constant velocity)</p>
<p>did we all get efficiency of 25%?</p>
<p>it was 8000 input 2000 output or whatever. so 25%</p>
<p>No I got 2/6 . . . 33% . . . noooo.</p>
<p>Please, someone say what the airplane question was. I’m afraid I skipped this page by accident and want to see if I remember it or not.</p>
<p>Any more questions u remember? feeling pretty bad on this test after doing good on sparknotes and barrons</p>
<p>I’m pretty sure the efficiency problem had an 8 not a 6, right?</p>
<p>it was 25%, work input was explicitly stated as 8000 J for the negativelt charged particle on question 6 was it just the kinda circular diagram with all arrows pointed away?</p>
<p>that’s what I put. What was the plate answer?</p>
<p>if we had the same exams… i’m not sure are they always the same copies?</p>
<p>the airplane one asked for the net force (i believe…w/e it was i’m sure the answer was 0)</p>
<p>i remember a lot of them actually but i want to confirm them as we go.</p>
<p>Also about the question with 2.5kg and 5m/s , what did u guys put, I put 12.5 but think it was wrong</p>
<p>the plate is with arrows pointing up</p>
<p>hb the question it said 150N block lifted with 180N force what is the acceleration? like .5, 1, 1.2, 2, 10</p>
<p>I had that but changed it, oh well</p>
<p>A negatively charged particle has arrows pointing inwards.
The plate one was the one with a bunch of arrows pointing upwards, in a line.</p>
<p>It said that it was out of 800 J total? Either I didn’t see that, or I put 25% and I don’t remember. Unfortunately I think it was the former.</p>
<p>The net force on an airplane at constant velocity?
Does anyone remember any other questions on the same page?</p>
<p>For the 150 block I put 1.2. Now when I calculate it though, I get 12. . .
Isn’t it F=ma, a = F/m = 180/15? (Not 150 because weight is 150, so mass is 15).</p>
<p>negative charges have fields pointing in</p>