The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICS Tuesday, January 23, 2001 — 9:15 a.m. to 12:15 p.m., only The answer paper is stapled in the center of this examination booklet. Open the examination book- let, carefully remove the answer paper, and close the examination booklet. Then fill in the heading on your answer paper. All of your answers are to be recorded on the separate answer paper. For each question in Part I and Part II, decide which of the choices given is the best answer. Then on the answer paper, in the row of numbers for that question, circle with pencil the number of the choice that you have selected. The sample below is an example of the first step in recording your answers. SAMPLE: 1 2 3 4 If you wish to change an answer, erase your first penciled circle and then circle with pencil the num- ber of the answer you want. After you have completed the examination and you have decided that all of the circled answers represent your best judgment, signal a proctor and turn in all examination material except your answer paper. Then and only then, place an X in ink in each penciled circle. Be sure to mark only one answer with an X in ink for each question. No credit will be given for any question with two or more X’s marked. The sample below indicates how your final choice should be marked with an X in ink. SAMPLE: 1 2 3 4 For questions in Part III, record your answers in accordance with the directions given in the exami- nation booklet. The Reference Tables for Physics, which you may need to answer some questions in this examination, are supplied separately. Be certain you have a copy of these reference tables before you begin the exami- nation. You must also have access to a centimeter ruler and a protractor during this examination. When you have completed the examination, you must sign the statement printed at the end of the answer paper, indicating that you had no unlawful knowledge of the questions or answers prior to the examination and that you have neither given nor received assistance in answering any of the questions during the examination. Your answer paper cannot be accepted if you fail to sign this declaration. DO NOT OPEN THIS EXAMINATION BOOKLET UNTIL YOU ARE TOLD TO DO SO. Part I Answer all 55 questions in this part. [65] Directions (1–55): For each statement or question, select the word or expression that, of those given, best completes the statement or answers the question. Record your answer on the separate answer paper in accor- dance with the directions on the front page of this booklet. 1 The maximum time allowed for the completion 4 Approximately how far will an object near of this examination is approximately Earth’s surface fall in 3.0 seconds? (1) 102 s(3)104 s (1) 88 m (3) 29 m (2) 103 s(4)105 s (2) 44 m (4) 9.8 m 2 The diagram below represents the relationship 5 A 5-newton force directed east and a 5-newton between velocity and time of travel for four cars, force directed north act concurrently on a point. A, B, C, and D, in straight-line motion. The resultant of the two forces is (1) 5 N northeast (3) 7 N northeast Velocity vs. Time (2) 10. N southwest (4) 7 N southwest A 6 Into how many possible components can a single B force be resolved? Velocity C 1 an unlimited number D 2 two components 0 5 10. 15 20. 3 three components 4 four components at right angles to each other Time (s) Which car has the greatest acceleration during 7 The graph below represents the relationship the time interval 10. seconds to 15 seconds? between the forces applied to an object and the corresponding accelerations produced. (1) A (3) C (2) B (4) D Force vs. Acceleration 2.0 3 The diagram below shows a block on a horizon- tal frictionless surface. A 100.-newton force acts 1.5 on the block at an angle of 30.° above the hori- 1.0 zontal. Force (N) 0.5 100. N 0 F 30.° 0 1.0 2.0 3.0 4.0 Block Acceleration (m/s2) Frictionless Surface What is the inertial mass of the object? (1) 1.0 kg (3) 0.50 kg What is the magnitude of force F if it establishes (2) 2.0 kg (4) 1.5 kg equilibrium? (1) 50.0 N (3) 100. N (2) 86.6 N (4) 187 N Physics–Jan. ’01 [2] 8 Which is a derived unit? 13 A 2.0-kilogram mass weighs 10. newtons on 1 meter 3 kilogram planet X. The acceleration due to gravity on 2 second 4 newton planet X is approximately (1) 0.20 m/s2 (3) 9.8 m/s2 (2) 5.0 m/s2 (4) 20. m/s2 9 What is the magnitude of the gravitational force between two 5.0-kilogram masses separated by a distance of 5.0 meters? Note that questions 14 and 15 have only three (1) 5.0 × 100 N (3) 6.7 × 10–11 N choices. (2) 3.3 × 10–10 N (4) 1.3 × 10–11 N 14 The graph below represents the motion of an object. 10 What is the displacement of the mass hanger (H) shown in the diagram after a 0.20-kilogram mass is loaded on it? [Assume the hanger is at rest in both positions.] Displacement 0cm Time According to the graph, as time increases, the 0cm 12cm velocity of the object H 0.20 kg 1 decreases Meter 2 increases Stick 3 remains the same 1cm 13cm H 15 A wooden block is at rest on a horizontal steel Unloaded Loaded surface. If a 10.-newton force applied parallel to the surface is required to set the block in motion, (1) 12.30 cm (3) 12.70 cm how much force is required to keep the block (2) 12.50 cm (4) 13.30 cm moving at constant velocity? (1) less than 10. N 11 Two cars having different weights are traveling (2) greater than 10. N on a level surface at different constant velocities. (3) 10. N Within the same time interval, greater force will always be required to stop the car that has the greater 16 In the diagram below, a 20.0-newton force is used to push a 2.00-kilogram cart a distance of 1 weight 3 velocity 5.00 meters. 2 kinetic energy 4 momentum 20.0 N 2.00 kg 12 A 0.050-kilogram bullet is fired from a 4.0- kilogram rifle that is initially at rest. If the bullet leaves the rifle with momentum having a magni- tude of 20. kilogram•meters per second, the rifle The work done on the cart is will recoil with a momentum having a magnitude of (1) 100. J (3) 150. J (1) 1,600 kg•m/s (3) 20. kg•m/s (2) 200. J (4) 40.0 J (2) 80. kg•m/s (4) 0.25 kg•m/s Physics–Jan. ’01 [3] [OVER] Note that questions 17 and 18 have only three choices. 17 The diagram below shows two identical wooden planks, A and B, at different incline angles, used to slide concrete blocks from a truck. Truck Bed 30.° B 45° A Compared to the amount of work done against friction by a block sliding down plank A, the work done against friction by a block sliding down plank B is 1 less 2 more 3 the same 18 Two vacationers walk out on a horizontal pier as shown in the diagram below. As they approach the end of the pier, their gravitational potential energy will 1 decrease 2 increase 3 remain the same Physics–Jan. ’01 [4] 19 A girl weighing 500. newtons takes 50. seconds 23 Which net charge could be found on an object? to climb a flight of stairs 18 meters high. Her (1) +3.2 × 10–18 C (3) –1.8 × 10–18 C power output vertically is (2) +2.4 × 10–19 C (4) –0.80 × 10–19 C (1) 9,000 W (3) 1,400 W (2) 4,000 W (4) 180 W 24 In the diagram below, two identical spheres, A and B, have equal net positive charges. 20 The graph below represents the elongation of a spring as a function of the applied force. P Force vs. Elongation ++ AB 24 Which arrow best represents the direction of their 18 resultant electric field at point P? 12 Force (N) Force ( 1 ) ( 3 ) 6.0 0 0 0.10 0.20 0.30 0.40 ( 2 ) ( 4 ) Elongation (m) How much work must be done to stretch the spring 0.40 meter? 25 How much work is done in moving 5.0 coulombs of charge against a potential difference of (1) 4.8 J (3) 9.8 J 12 volts? (2) 6.0 J (4) 24 J (1) 2.4 J (3) 30. J (2) 12 J (4) 60. J 21 Metal sphere A has a charge of +12 elementary charges and identical sphere B has a charge of +16 elementary charges. After the two spheres are 26 Compared to insulators, metals are better con- brought into contact, the charge on sphere A is ductors of electricity because metals contain more free (1) –2 elementary charges (2) +2 elementary charges 1 protons 3 positive ions (3) +14 elementary charges 2 electrons 4 negative ions (4) +28 elementary charges 27 If a 15-ohm resistor is connected in parallel with 22 Electrostatic force F exists between two point a 30.-ohm resistor, the equivalent resistance is charges.