TEST 1 Your responses to the Physics Subject Test questions should be filled in on Test 1 of your answer sheet (at the back of the book). SAT PHYSICS SUBJECT TEST 1 426 | Cracking the SAT Physics Subject Test Questions 1-4 For an object traveling in a straight line, its velocity (v, in m/s) as a function of time (t, in s) is given by the following graph. v t Questions 1-4 relate to the following graphs. (A) t (D) t t (B) (E) t t (C) 1. Which graph best depicts the objects momentum? 2. Which graph best illustrates the objects acceleration? 3. Which graph best depicts the objects kinetic energy? 4. Which graph best illustrates the objects distance from its starting point? Questions 5-8 (A) Displacement (B) Velocity (C) Acceleration (D) Linear momentum (E) Kinetic energy 5. Which one is NOT a vector? 6. If an objects mass and the net force it feels are both known, then Newtons second law could be used to directly calculate which quantity? 7. Which quantity can be expressed in the same units as impulse? 8. If an objects speed is changing, which of the quantities could remain constant? Part A Directions: Each set of lettered choices below refers to the numbered questions immediately following it. Select the one letter choice that best answers each question or best fits each statement, and then fill in the corresponding oval on the answer sheet. A choice may be used once, more than once, or not at all in each set. PHYSICS SUBJECT TEST 1 75 Questions Time limit = 1 hour You may NOT use a calculator. GO ON TO THE NEXT PAGE PHYSICS SUBJECT TEST 1Continued The Princeton Review Practice SAT Physics Subject Test 1 | 427 GO ON TO THE NEXT PAGE Questions 9-10 (A) Newtons law of universal gravitation (B) Red shift of light from other galaxies (C) The fact that every element of atomic number greater than 83 is radioactive (D) The zeroth law of thermodynamics (E) Massenergy equivalence 9. Which provides the basis for the observation that the universe is expanding? 10. Which principle could be used to help calculate the amount of radiation emitted by a star? Questions 11-12 (A) Reflection (B) Refraction (C) Polarization (D) Diffraction (E) Interference 11. Which is due to the change in wave speed when a wave strikes the boundary to another medium? 12. Which phenomenon is NOT experienced by sound waves? PHYSICS SUBJECT TEST 1Continued 428 | Cracking the SAT Physics Subject Test GO ON TO THE NEXT PAGE Part B Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case and then fill in the corresponding oval on the answer sheet. 13. An astronaut standing on the surface of the moon (mass = M, radius = R) holds a feather (mass = m) in one hand and a hammer (mass = 100m) in the other hand, both at the same height above the surface. If he releases them simultaneously, what is the acceleration of the hammer? (A) mv r 2 (B) GM R2 (C) GMm R2 (D) 100 GM R2 (E) 100 GMm R2 Satellite #2 Satellite #1 E 2r r 14. Two satellites orbit the earth. Their orbits are circular, and each satellite travels at a constant speed. If the mass of Satellite #2 is twice the mass of Satellite #1, which satellites speed is greater? (A) Satellite #1, by a factor of 2 (B) Satellite #1, by a factor of 2 (C) Satellite #2, by a factor of 2 (D) Satellite #2, by a factor of 2 (E) Neither; the satellites speeds are the same. Questions 15-17 refer to the collision of two blocks on a frictionless table. Before the collision, the block of mass m is at rest. 4 kgm just before collision just after collision 4 kgm 8 m/sv 6 m/s 15. What is the total momentum of the blocks just AFTER the collision? (A) 12 kg-m/s (B) 16 kg-m/s (C) 18 kg-m/s (D) 24 kg-m/s (E) 32 kg-m/s 16. If the collision were elastic, what is the total kinetic energy of the blocks just AFTER the collision? (A) 16 J (B) 32 J (C) 64 J (D) 128 J (E) 256 J 17. If the blocks had instead stuck together after the collision, with what speed would they move if m = 12 kg ? (A) 2.0 m/s (B) 2.7 m/s (C) 3.2 m/s (D) 4.0 m/s (E) 4.6 m/s PHYSICS SUBJECT TEST 1Continued The Princeton Review Practice SAT Physics Subject Test 1 | 429 GO ON TO THE NEXT PAGE +Q +q fixed in position 18. The figure above shows two positively charged particles. The +Q charge is fixed in position, and the +q charge is brought close to +Q and released from rest. Which of the following graphs best depicts the acceleration (a) of the +q charge as a function of its distance (r) from +Q ? a r (A) a r (D) a r (B) a r (E) a r (C) 19. Two particles have unequal charges; one is +q and the other is 2q. The strength of the electrostatic force between these two stationary particles is equal to F. What happens to F if the distance between the particles is halved? (A) It decreases by a factor of 4. (B) It decreases by a factor of 2. (C) It remains the same. (D) It increases by a factor of 2. (E) It increases by a factor of 4. 20. A s