help me with this physics regent question

Test Preparation
1

<p>I know its supposed to be easy, but I'm confused by this question. Its here, #47, <a href="http://www.nysedregents.org/testing/scire/sciarch/psphystestja03.pdf%5B/url%5D"&gt;http://www.nysedregents.org/testing/scire/sciarch/psphystestja03.pdf&lt;/a&gt;&lt;/p>

<p>answer is supposed to be 2. How to do it?</p>

2

<p>Ahh.. taking a regents?</p>

3

<p>current in = current out
there are 5 A going in to the node besides the wire with the ammeter, and 7 A going out of the node</p>

<p>Therefore the wire with the ammeter must carrry 7 - 5 = 2 A</p>

4

<p>Oh i get it. I didnt get what the diagram represented.</p>

<p>One more question though, for #48, the ans is supposed to be (1) 0.333</p>

<p>But I did the calculation and got .94</p>

<p>Help? I can't believe I'm not getting these. IS it just me?</p>

5

<p>sin(30deg) = .5
anglex is less than 30deg, so sin(anglex) must be < .5</p>

6

<p>It's choice 3</p>