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ame: ________________________ Exam 1--PHYS 101--F10--Chapters 1-3A Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Which answer has the appropriate significant figures for this mathematical operation: 1.0 × 0.01 3.4 ____ a. 0.003 c. 0.00294 b. 0.0029 d. 0.002941 2. What is the area of the projection screen at the front of this room? ____ a. 1 m2 c. 100 m2 b. 10 m2 d. 1000 m2 3. Which of these is a reason that a standard of measurement is not appropriate? I. The standard changes. II. The standard is not available to everyone. III. The standard is based on some obscure physical constant. IV. The standard smells really bad. a. b. c. ____ IV only I only I & III d. e. II & III I & II 4. Is this equation dimensionally correct? xam 1 2 a = 2 mv t v Units m: kg t: s x: m v: a: a. No b. 1 Yes m s m s 2 ____ ____ ____ 5. A car accelerates at 10. m/s 2. What is this acceleration in km/hr 2? c. 36x106 km/hr2 a. 0.01 km/hr2 2 b. 36 km/hr d. 130,000 km/hr2 6. A house is 45 ft long and 32 ft wide and has 8.0-ft-high ceilings. What is the volume of the interior of the house in cubic centimeters? (1 meter=3.3 feet) c. 320 cm3 a. 350,000 cm3 3 b. 11520 cm d. 3.2x108 cm3 7. Since 1983 the standard meter has been defined in terms of which of the following? wavelength of light emitted by c. the distance light travels in 1/(3 x 10 8) krypton-86 second b. specific alloy bar housed at Sevres, d. distance from the Earth's equator to the France north pole 8. You drive 4 miles at 60 mi/hr and then another 4 miles at 40 mi/hr. What is your average speed for the whole 8-mile trip? a. ____ ____ a. less than 50 mi/hr c. more than 50 mi/hr b. equal to 50 mi/hr d. not enough information 9. Describe the motion of the particle shown in this graph a. b. c. decreasing, negative velocity increasing, positive velocity zero velocity d. e. 2 decreasing, positive velocity constant, positive velocity ____ 10. This graph represents the motion of a particle. What is the particle’s instantaneous velocity at t=4 seconds? a. 3 m/s d. -2 m/s b. 1.5 m/s e. 0 m/s c. 6 m/s ____ 11. In the previous graph, what is the average velocity between t=0 and t=2 seconds? a. b. -2 m/s -1.5 m/s c. d. 3 -1.0 m/s -2.5 m/s ____ 12. You throw a ball into the air, and it returns to your hand. Which of these plots best describes the motion of the ball from the moment you release it to the moment just before you catch it? c. a. b. d. ____ 13. You drop a ball from a cliff of 110 meters. How long before the ball hits bottom? a. b. c. 9.8 s 3.2 s 3.4 s d. e. 4 11 s 4.7 s ____ 14. A speeding car is traveling 40 m/s and is pulled over by a state trooper. The car decelerates at 2.0 m/s 2. What distance does the car travel before it stops? a. 400 m c. 1200 m b. 80 m d. 100 m ____ 15. In this graph, what is the instantaneous acceleration at point C? a. 2 m/s2 d. -2 m/s2 b. 1 m/s2 e. 0.5 m/s2 2 c. 1 m/s ____ 16. You throw a ball upward with an initial speed of 10 m/s. Assuming that there is no air resistance, what is its speed when it returns to you? a. b. less than 10 m/s equal to 10 m/s c. 5 more than 10 m/s ____ 17. Which of these statements about vectors is incorrect? d. A vector can have a magnitude greater A and If || A 2 || + || B 2 || = || C 2 || , the vectors ä than one of its components. ä B are perpendicular to one another. b. A vector lies just above the x-axis in e. All of these are incorrect. quadrant I. Both of its components are positive. ä , then ä| and ä c. If || ä A || + || ä B || = || C A +ä B=C | A and ä B are parallel and in the vectors ä the same direction. ____ 18. While exploring a cave, a spelunker starts at the entrance and moves the following distances: 62.0 m South, 130.0 m at an angle 30.° north of east and 20.0 m south. Find the magnitude of the resultant displacement from the cave entrance. a. a. b. 48.0 m 185 c. d. 6 114 m 212 m ____ 19. The following figure shows vectors ä A and ä B . What is the result of the difference ä A −ä B? a. c. b. d. ____ 20. The vector ä A is has components A x and A y , which are both positive. If || A x || < || A y || , which of these is the A. possible direction for the vector ä a. b. c. 72° above the negative x-axis d. 64° above the positive x-axis 55° below the positive x-axis e. 43° above the negative x-axis 45° above the positive x-axis A has a magnitude of 12 m and vector ä B has a magnitude of 25 m, which of these is a possible ____ 21. If vector ä ä ä solution for the sum A + B ? a. b. 55 m 38 m c. d. 7 32 m 9m ____ 22. A particle begins at the origin (0,0) and travels 3.4 m to the right. Then it moves 2.8 meters at 120° from the +x-axis. Finally, it moves 1.2 m down. What is the magnitude of the particle’s displacement? a. b. 7.4 m 3.2 m c. d. 5.0 m 2.3 m Ö is ____ 23. The accretion luminosity of a protostar is given by this equation where G is the gravitational constant, M the accretion rate, M * is the protostellar mass, and R is the accretion radius.: L= ÖM* GM R Then, which of these is/are possible explanation(s) for low-luminosity protostars? a. small protostellar mass c. Large accretion radius b. Low accretion rate d. All of these ____ 24. Based on this graph, which statement best describes the location of stars located in quadrant IV? a. Closer than and in front of the c. More distant than and directly behind the star-forming core star-forming core b. More distant than but to the side of the d. None of these star-forming core ____ 25. The answer to this question is “A.” Bubble “A” on your scantron. a. A c. C b. B d. D 8 ID: A Exam 1--PHYS 101--F10--Chapters 1-3A Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. ANS: A PTS: 1 ANS: B PTS: 1 ANS: E PTS: 1 ANS: B PTS: 1 ANS: D PTS: 1 ANS: D PTS: 1 ANS: C PTS: 1 ANS: A PTS: 1 ANS: B PTS: 1 ANS: A PTS: 1 ANS: B PTS: 1 ANS: D PTS: 1 ANS: E Easy one-step problem, kinematics PTS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: 1 A D B D C D D C D D B A PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: 1 1 1 1 1 1 1 1 1 1 1 1 1