The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING PHYSICS

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2 Part A Answer all questions in this part. Directions (1 35): For each statement or question, write on the separate answer sheet the number of the word or expression that, of those given, best completes the statement or answers the question. 1 On a highway, a car is driven 80. kilometers during the first 1.00 hour of travel, 50. kilometers during the next 0.50 hour, and 40. kilometers in the final 0.50 hour. What is the car s average speed for the entire trip? (1) 45 km/h (3) 85 km/h (2) 60. km/h (4) 170 km/h 2 The vector diagram below represents the horizontal component, F H, and the vertical component, F V, of a 24-newton force acting at 35 above the horizontal. 5 A 25-newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 1.0 second? (1) 19.6 m (3) 4.9 m (2) 9.8 m (4) 2.5 m 6 A golf ball is given an initial speed of 20. meters per second and returns to level ground. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? [Neglect friction.] (1) 60. (3) 30. (2) 45 (4) 15 F V 24 N F H What are the magnitudes of the horizontal and vertical components? (1) F H = 3.5 N and F V = 4.9 N (2) F H = 4.9 N and F V = 3.5 N (3) F H = 14 N and F V = 20. N (4) F H = 20. N and F V = 14 N 3 Which quantity is a vector? (1) impulse (3) speed (2) power (4) time 4 A high-speed train in Japan travels a distance of 300. kilometers in seconds. What is the average speed of this train? (1) m/s (3) 12.0 m/s (2) m/s (4) 83.3 m/s Base your answers to questions 7 and 8 on the information below. A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. The magnitude of the maximum centripetal force exerted by the track on the go-cart is newtons. 7 What is the maximum speed the 200.-kilogram go-cart can travel without sliding off the track? (1) 8.0 m/s (3) 150 m/s (2) 12 m/s (4) 170 m/s 8 Which change would increase the maximum speed at which the go-cart could travel without sliding off this track? (1) Decrease the coefficient of friction between the go-cart and the track. (2) Decrease the radius of the track. (3) Increase the radius of the track. (4) Increase the mass of the go-cart. Physics June 09 [2]

3 9 A 0.50-kilogram cart is rolling at a speed of 0.40 meter per second. If the speed of the cart is doubled, the inertia of the cart is (1) halved (3) quadrupled (2) doubled (4) unchanged 10 Two forces, F 1 and F 2, are applied to a block on a frictionless, horizontal surface as shown below. F 1 = 12 N Frictionless surface Block F 2 = 2 N If the magnitude of the block s acceleration is 2.0 meters per second 2, what is the mass of the block? (1) 1 kg (3) 6 kg (2) 5 kg (4) 7 kg 11 Which body is in equilibrium? (1) a satellite orbiting Earth in a circular orbit (2) a ball falling freely toward the surface of Earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory 12 What is the weight of a 2.00-kilogram object on the surface of Earth? (1) 4.91 N (3) 9.81 N (2) 2.00 N (4) 19.6 N 13 A 70.-kilogram cyclist develops 210 watts of power while pedaling at a constant velocity of 7.0 meters per second east. What average force is exerted eastward on the bicycle to maintain this constant speed? (1) 490 N (3) 3.0 N (2) 30. N (4) 0 N 14 The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object s (1) acceleration (3) position (2) momentum (4) speed Note that question 15 has only three choices. 15 As a ball falls freely toward the ground, its total mechanical energy (1) decreases (2) increases (3) remains the same 16 A spring with a spring constant of 4.0 newtons per meter is compressed by a force of 1.2 newtons. What is the total elastic potential energy stored in this compressed spring? (1) 0.18 J (3) 0.60 J (2) 0.36 J (4) 4.8 J 17 A distance of 1.0 meter separates the centers of two small charged spheres. The spheres exert gravitational force F g and electrostatic force F e on each other. If the distance between the spheres centers is increased to 3.0 meters, the gravitational force and electrostatic force, respectively, may be represented as Fg Fe (1) and (3) 3F g and 3F e 9 9 Fg F (2) e and (4) 9F g and 9F e The electrical resistance of a metallic conductor is inversely proportional to its (1) temperature (3) cross-sectional area (2) length (4) resistivity 19 In a simple electric circuit, a 24-ohm resistor is connected across a 6.0-volt battery. What is the current in the circuit? (1) 1.0 A (3) 140 A (2) 0.25 A (4) 4.0 A 20 An operating 100.-watt lamp is connected to a 120-volt outlet. What is the total electrical energy used by the lamp in 60. seconds? (1) 0.60 J (3) J (2) 1.7 J (4) J Physics June 09 [3] [OVER]

4 21 A beam of electrons is directed into the electric field between two oppositely charged parallel plates, as shown in the diagram below. Electron beam The electrostatic force exerted on the electrons by the electric field is directed (1) into the page (2) out of the page (3) toward the bottom of the page (4) toward the top of the page 22 When two ring magnets are placed on a pencil, magnet A remains suspended above magnet B, as shown below. A 24 Which type of wave requires a material medium through which to travel? (1) sound (3) television (2) radio (4) x ray 25 A periodic wave is produced by a vibrating tuning fork. The amplitude of the wave would be greater if the tuning fork were (1) struck more softly (2) struck harder (3) replaced by a lower frequency tuning fork (4) replaced by a higher frequency tuning fork 26 The sound wave produced by a trumpet has a frequency of 440 hertz. What is the distance between successive compressions in this sound wave as it travels through air at STP? (1) m (3) 1.3 m (2) 0.75 m (4) m 27 The diagram below represents a light ray striking the boundary between air and glass. Normal B Which statement describes the gravitational force and the magnetic force acting on magnet A due to magnet B? (1) The gravitational force is attractive and the magnetic force is repulsive. (2) The gravitational force is repulsive and the magnetic force is attractive. (3) Both the gravitational force and the magnetic force are attractive. (4) Both the gravitational force and the magnetic force are repulsive. 23 Which color of light has a wavelength of meter in air? (1) blue (3) orange (2) green (4) violet Air Glass What would be the angle between this light ray and its reflected ray? (1) 30. (3) 120. (2) 60. (4) In which way does blue light change as it travels from diamond into crown glass? (1) Its frequency decreases. (2) Its frequency increases. (3) Its speed decreases. (4) Its speed increases. Physics June 09 [4]

5 29 The diagram below shows two pulses approaching each other in a uniform medium. 5 cm 10. cm 32 An electron in the c level of a mercury atom returns to the ground state. Which photon energy could not be emitted by the atom during this process? (1) 0.22 ev (3) 4.86 ev (2) 4.64 ev (4) 5.43 ev Which diagram best represents the superposition of the two pulses? 7.5 cm ( 1 ) 5 cm ( 3 ) 33 Which phenomenon provides evidence that light has a wave nature? (1) emission of light from an energy-level transition in a hydrogen atom (2) diffraction of light passing through a narrow opening (3) absorption of light by a black sheet of paper (4) reflection of light from a mirror 15 cm ( 2 ) 5 cm ( 4 ) 30 Sound waves strike a glass and cause it to shatter. This phenomenon illustrates (1) resonance (3) reflection (2) refraction (4) diffraction 31 An alpha particle consists of two protons and two neutrons. What is the charge of an alpha particle? (1) C (3) C (2) 2.00 C (4) C 34 When Earth and the Moon are separated by a distance of meters, the magnitude of the gravitational force of attraction between them is newtons. What would be the magnitude of this gravitational force of attraction if Earth and the Moon were separated by a distance of meters? (1) N (3) N (2) N (4) N 35 The particles in a nucleus are held together primarily by the (1) strong force (3) electrostatic force (2) gravitational force (4) magnetic force Physics June 09 [5] [OVER]

6 Part B 1 Answer all questions in this part. Directions (36 47): For each statement or question, write on the separate answer sheet the number of the word or expression that, of those given, best completes the statement or answers the question. 36 The work done in lifting an apple one meter near Earth s surface is approximately (1) 1 J (3) 100 J (2) 0.01 J (4) 1000 J Base your answers to questions 37 and 38 on the graph below, which represents the motion of a car during a 6.0-second time interval. Velocity (m/s) Velocity vs. Time Time (s) 37 What is the acceleration of the car at t = 5.0 seconds? (1) 0.0 m/s 2 (3) 2.5 m/s 2 (2) 2.0 m/s 2 (4) 10. m/s 2 38 What is the total distance traveled by the car during this 6.0-second interval? (1) 10. m (3) 40. m (2) 20. m (4) 60. m 39 A person weighing 785 newtons on the surface of Earth would weigh 298 newtons on the surface of Mars. What is the magnitude of the gravitational field strength on the surface of Mars? (1) 2.63 N/kg (3) 6.09 N/kg (2) 3.72 N/kg (4) 9.81 N/kg 40 A motorcycle being driven on a dirt path hits a rock. Its 60.-kilogram cyclist is projected over the handlebars at 20. meters per second into a haystack. If the cyclist is brought to rest in 0.50 second, the magnitude of the average force exerted on the cyclist by the haystack is (1) N (3) N (2) N (4) N Base your answers to questions 41 and 42 on the information below. Force (N) A boy pushes his wagon at constant speed along a level sidewalk. The graph below represents the relationship between the horizontal force exerted by the boy and the distance the wagon moves Force vs. Distance Distance (m) 41 What is the total work done by the boy in pushing the wagon 4.0 meters? (1) 5.0 J (3) 120 J (2) 7.5 J (4) 180 J 42 As the boy pushes the wagon, what happens to the wagon s energy? (1) Gravitational potential energy increases. (2) Gravitational potential energy decreases. (3) Internal energy increases. (4) Internal energy decreases. Physics June 09 [6]

7 43 Which is an SI unit for work done on an object? 2 kg m kg m (1) (3) 2 s s 2 kg m (2) (4) s kg m s 2 44 The momentum of a photon, p, is given by the equation p = h where h is Planck s constant and λ λ is the photon s wavelength. Which equation correctly represents the energy of a photon in terms of its momentum? (1) Ephoton = phc (3) E p photon = c (2) hp Ephoton c (4) E photon = pc 45 A constant potential difference is applied across a variable resistor held at constant temperature. Which graph best represents the relationship between the resistance of the variable resistor and the current through it? 46 A 3.0-ohm resistor and a 6.0-ohm resistor are connected in series in an operating electric circuit. If the current through the 3.0-ohm resistor is 4.0 amperes, what is the potential difference across the 6.0-ohm resistor? (1) 8.0 V (3) 12 V (2) 2.0 V (4) 24 V 47 Which combination of resistors has the smallest equivalent resistance? ( 1 ) ( 2 ) 2 Ω 2 Ω 2 Ω 2 Ω 1 Ω Current ( 3 ) Resistance Resistance 1 Ω ( 1 ) ( 3 ) ( 4 ) 1 Ω 1 Ω Current Current Current Resistance ( 2 ) Resistance ( 4 ) Physics June 09 [7] [OVER]

9 Base your answers to questions 58 and 59 on the information and diagram below. The vertical lines in the diagram represent compressions in a sound wave of constant frequency propagating to the right from a speaker toward an observer at point A. Speaker A Distance (meters) Determine the wavelength of this sound wave. [1] 59 The speaker is then moved at constant speed toward the observer at A. Compare the wavelength of the sound wave received by the observer while the speaker is moving to the wavelength observed when the speaker was at rest. [1] Physics June 09 [9] [OVER]

10 Base your answers to questions 60 through 62 on the information below. The path of a stunt car driven horizontally off a cliff is represented in the diagram below. After leaving the cliff, the car falls freely to point A in 0.50 second and to point B in 1.00 second. v Part C Answer all questions in this part. Directions (60 72): Record your answers in the spaces provided in your answer booklet. A d y B Distance From Base of Cliff (m) 60 Determine the magnitude of the horizontal component of the velocity of the car at point B. [Neglect friction.] [1] 61 Determine the magnitude of the vertical velocity of the car at point A. [1] 62 Calculate the magnitude of the vertical displacement, d y, of the car from point A to point B. [Neglect friction.] [Show all work, including the equation and substitution with units.] [2] Physics June 09 [10]

11 Base your answers to questions 63 through 65 on the information below. A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds. 63 Calculate the height of the hill. [Neglect friction.] [Show all work, including the equation and substitution with units.] [2] 64 Calculate the speed of the roller coaster car at the bottom of the hill. [Show all work, including the equation and substitution with units.] [2] 65 Calculate the magnitude of the average acceleration of the roller coaster car as it descends to the bottom of the hill. [Show all work, including the equation and substitution with units.] [2] Base your answers to questions 66 and 67 on the information below. One end of a rope is attached to a variable speed drill and the other end is attached to a 5.0-kilogram mass. The rope is draped over a hook on a wall opposite the drill. When the drill rotates at a frequency of 20.0 Hz, standing waves of the same frequency are set up in the rope. The diagram below shows such a wave pattern. f = 20.0 Hz Drill 3.0 m 5.0 kg 66 Determine the wavelength of the waves producing the standing wave pattern. [1] 67 Calculate the speed of the wave in the rope. [Show all work, including the equation and substitution with units.] [2] Physics June 09 [11] [OVER]

12 Base your answers to questions 68 and 69 on the information below. A ray of monochromatic light ( f = Hz) passes from air into Lucite at an angle of incidence of Calculate the angle of refraction in the Lucite. [Show all work, including the equation and substitution with units.] [2] 69 Using a protractor and straightedge, on the diagram in your answer booklet, draw the refracted ray in the Lucite. [1] Base your answers to questions 70 through 72 on the information below. A photon with a frequency of hertz is emitted when an electron in a mercury atom falls to a lower energy level. 70 Identify the color of light associated with this photon. [1] 71 Calculate the energy of this photon in joules. [Show all work, including the equation and substitution with units.] [2] 72 Determine the energy of this photon in electronvolts. [1] Physics June 09 [12]

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