<p>I have decided to go on to take the physics C test, instead of the B one. My teacher let me borrow his Physics for scientists and engineers, by Tipler, 5th edition. I am just wondering if other people have a hard time on the two and 3 circle problems. I get around 1/2 => 2/3 of the 2 and so far am 1 for 4 on the 3 star. Is the C test anything as difficult as some of these problems. I am specifically referring to chapter 9 on rotation and chapter 25 on magnetism. I guess I need to get a lot better in calculus because finding the cm is killing me. Just looking for some reassurance.</p>
<p>A ball is dropped from a building, and another ball B is thrown upward. The two balls collide with Va = 2<em>Vb. What is the fraction of the height of the building when they collide. I get 3/8 but I dont think that is right.
Also, when B is coming back down, they meet with Va = 4</em>Vb, what is the height at which they meet. THe answer is 1/3 but can someone show me how to get it.</p>
<p>Which is better: Tipler or Halliday?</p>
<p>The three circle questions are much harder than anything on the AP. Don’t worry about not getting all of them…I’m in the same boat as you. The two circle, however, are much closer to what’s on the exam. The only difference is that the questions in the book generally focus on one topic, whereas on the AP FR section you might have momentum, rotation, kinematics, and conservation of energy all in the same problem…it tends to be less in depth but more broad and you’ll have to bring together quite a bit of different knowledge. There are some parts similar in difficulty to the two circle questions, but those are generally the main part of an otherwise very easy FR question.</p>