SATII PHYSICS questions!

Test Preparation
1

<p>Which of the following best explains why two protons in the nucleus of an atom don't push away from one another in accordance with Coulomb's Law?</p>

<p>(A) Rutherford's model of the atom
(B) Other neutrons in the nucleus
(C) Wave-particle duality
(D) Conservation of charge
(E) Length contraction</p>

<p>An experimenter adds thermal energy to a block of some solid substance but the temperature of the substance does not change. Which of the following explains this effect?</p>

<p>I. The thermal energy is used in phase transformation.
II. The thermal energy increases the entropy of the substance
III. The thermal energy is lost because heat engines can never be perfectly efficient.</p>

<p>(A) I only
(B) II only
(C) III only
(D) I and II only
(E) I and III only</p>

2

<p>I believe 1 is (B) because there is a nuclear force that stems from the neutrons that holds the nucleus togther. </p>

<p>I think the 2nd one is (A), because temperature doesn’t change during phase changes with the addition or release of heat.</p>

<p>Correct me if I’m wrong</p>

3

<p>I thought that the strong nuclear force kept the protons together. Also, I thought in the Rutherford’s goldfoil experiment, Rutherford postulated that the protons were in the center of the atom.</p>

<p>For #2, you are correct, but I thought that some energy could be used to change the entropy (through a phase change).</p>