<p>I thought that was 220 km/h. The wind was 90 km/h south and the plane was 200 km/h west. For it to be a right triangle, it had to be between 200 and 290. 220 was the only number that fits.</p>
<p>yeah I just found the hypotenuse… I wasn’t really sure if that was what it was asking for or not though :</p>
<p>I think the answer for the colliding mud balls one is that heat is created. Basically what I could find from a quick google and I remember the other choices did not make any sense.</p>
<p>Hi Char! </p>
<p>BTW, is the embargo lifted? LOL</p>
<p>What score would I get if I skipped around 17, and got around 7 wrong? I thought the test was hard O_o</p>
<p>@bonni1993</p>
<p>i got 800</p>
<p>@charizard</p>
<p>i love atomic number and mass.</p>
<p>JK :)</p>
<p>A raw score of 45 is a 700 so you probably got 700+.
Did anyone think that the physics test in the Official Study Guide for Subject Tests was extremely easy? because I got a 790 on that and today I skipped 13 questions :/</p>
<p>@carson</p>
<p>Very Funny.
you didn’t even take the test.</p>
<p>Heat is created!!! Isn’t mechanical energy conserved? NOOOO…</p>
<p>@jumpshooter, yeah the one in the Official Study Guide is insanely easy by comparison… for some reason haha :</p>
<p>What would a raw score of 50 be? Also, did anyone think that even the BARRON’S tests were a lot easier than this? Because I was scoring almost 800s on those, but I messed up on the real thing…
Also, is the curve that CB gives in their official book accurate? Or is it unrealistic? Sorry for asking so many questions, but I’m rather flustered after taking it :/</p>
<p>@charizard</p>
<p>Ya… I put that heat is created.</p>
<p>Kinetic energy is not conserved in a perfectly inelastic collision, so heat was created.</p>
<p>GAHHHHH ■■■■ I hate my life… I have like 5 wrong already…</p>
<p>wait how is the force the string exerts on the ball the same as the force the ball exerts on the earth?</p>
<p>If its not, then the ball would fall down.</p>
<p>can someone explain why the number of electrons has to be equal to the atomic number in a neutral atom? couldn’t the number of protons decrease due to radiation or something and then if there were less electrons the atom would still be neutral?</p>
<p>also what was the answer to the question which asked what ray had the most energy? I guessed that it was a gamma ray…</p>
<p>bravosix, I think it’;s 290. Because the wind is 90kmh relative to ground and the plane is 200 relative to the air. So, might need to add both of them. </p>
<p>I think this is part of relativity. For eg, a train is moving in 100kmh , u walk 10kmh
ur speed is 110.
Having said that, I did not consider the direction. Thus, I maybe wrong but the quetion is asking the speed of the plane relative to ground. Since 200 is not relative to ground, adding with 90 may just be the answer.</p>
<p>Aint sure.</p>
<p>@jumpshooter
because the electrons and the protons have to balance each other out in order for the atom to be neutral.</p>
<p>@alphalion Well I thought that the plane was moving perpendicular to the direction of the wind, which is why I took the hypotenuse. If it was moving in the same direction, then you would be correct. Argh I can’t remember what the question was asking. -_-</p>
<p>Energy is conserved in an elastic collision. Momentum is always conserved. The mud balls sticking together would be inelastic.</p>
<p>I agree with bonni1993’s reasoning. It’s both atomic number and number of protons.</p>
<p>@bravosix, it was something like the wind was going south relative to the ground, and then the plane was going west relative to the wind… I’m pretty sure it wasn’t in the same direction :</p>