<p>First:
You are in a glider traveling due east at 60 km per hour relative to an air mass that is traveling due north at 60 km per hour relative to the ground. Your motion relative to the ground is
(A)due east
(B)northeast
(C)due north
(D)southwest
(E)South</p>
<p>Second Question:
(A)Electron
(B)Proton
(C)Neutron
(D)Positron
(E)Alpha particle</p>
<p>If all of the particles were in the same electric field, which would be accelerated in a direction opposite to the field?</p>
<p>The first answer is B, the second answer is A. Can anyone please explain quick?! My SAT physics is this saturday!!</p>
<p>For the first question:</p>
<p>Just use common sense really. The balloon (or air mass) is going north. The glider is, at all times going east from the balloon, so in fact (relative to the ground) the glider is multi-directional. Just draw some vectors now:
^…/
|…/
|…/<br>
()…{}/</p>
<p>Hopefully you can see the glider is traveling NE.</p>
<p>2.</p>
<p>The electric field’s direction is designated by the motion of a proton (this is just physics convention). So an electron will obviously move in the opposite direction. Positron is an inverse electron (i.e. a proton with no mass), and an alpha particle has a positive charge too.</p>
<p>^Thanks so much! I had thought that the proton thing was physics convention and thanks for clearing up that vector problem, just as a clarification though, when I look at that diagram, am i looking at it from above, where the ground is below it, or is when i am looking at it from the side?</p>
<p>Thanks.</p>
<p>The first one is a lot easier than you think. If the glider is moving east, and the air mass is pushing it north at the same time, which way is it going? Northeast.</p>
<p>^Oh ok, that’s a little more clear; thanks!</p>