<p>which question # was this?</p>
<p>(i didn't actually take this test)</p>
<p>ack, now I'm worried i got points off for stupid things like leaving out units!! ugh!!</p>
<p>Yunu, yes, you clearly said that the angle " increases TO 45 FROM 30"
A firing of angle of 45 has the greatest horizontal distance, so if you are increasing the angle FROM 30 TO 45, the horizontal distance would INCREASE.</p>
<p>alright guys help me out here. I have 2 instead of 2.04 and 1 instead of .98 cus i used 10 for gravity because my teacher said it was ok. is that fine? will i get credit? also my teacher said at 45 degrees the horizontal distance is maximized, moreso than a higher or lower angle measurement. and for the refraction diagram, i got 17.5 and 11.8 for my angles? is that close enough? because there has to be a margin of error. And if someone doesnt mind can you please explain number 20. because i got choice 4 and would like to know whereI messed up. Ty in advance for the help.</p>
<p>your fine with the roundoff error, no big deal..</p>
<p>As for number 20</p>
<p>electrical energy is your work, so w=1950 joules
one hour needs to be converted to seconds to be used as your time, so there are 3600 seconds in one hour (1<em>60min/hr</em>60sec/min)</p>
<p>since Power = work/time
you get: Power = (1950j/3600s)= about .54 j/s
Now since we're solving for resistance and know that the voltage is 4.5v, you can use the equation Power=((voltage)^2)/resistance
To solve for resistance you get, resistance = (voltage^2)/power
you get ((4.5v)^2)/.54j/s=37.5 ohms</p>
<p>37.4ohms is the correct answer due to rounding errors</p>
<p>hope that helps! any questions pm me!</p>
<p>kk. thanks alot!</p>
<p>I got a 95. Yay!</p>
<p>Good job! 83 for me. I struggled all year in that class (it was AP Physics B) and failed more than one test, so I'm happy. It really depends on the subject for me. If I had gotten that on US History Regents, for example, I would've been very annoyed. Everyone has their strengths, I guess.</p>