# The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION PHYSICAL SETTING PHYSICS. Thursday, June 13, :15 to 4:15 p.m.

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2 Part A Answer all questions in this part. Directions (1 35): For each statement or question, choose the word or expression that, of those given, best completes the statement or answers the question. Some questions may require the use of the 2006 Edition Reference Tables for Physical Setting/Physics. Record your answers on your separate answer sheet. 1 Which term identifies a scalar quantity? (1) displacement (3) velocity (2) momentum (4) time 2 Two 20.-newton forces act concurrently on an object. What angle between these forces will produce a resultant force with the greatest magnitude? (1) 0 (3) 90. (2) 45 (4) A car traveling west in a straight line on a highway decreases its speed from 30.0 meters per second to 23.0 meters per second in 2.00 seconds. The car s average acceleration during this time interval is (1) 3.5 m/s 2 east (3) 13 m/s 2 east (2) 3.5 m/s 2 west (4) 13 m/s 2 west 4 In a race, a runner traveled 12 meters in 4.0 seconds as she accelerated uniformly from rest. The magnitude of the acceleration of the runner was (1) 0.25 m/s 2 (3) 3.0 m/s 2 (2) 1.5 m/s 2 (4) 48 m/s 2 5 A projectile is launched at an angle above the ground. The horizontal component of the projectile s velocity, v x, is initially 40. meters per second. The vertical component of the projectile s velocity, v y, is initially 30. meters per second. What are the components of the projectile s velocity after 2.0 seconds of flight? [Neglect friction.] (1) v x = 40. m/s and v y = 10. m/s (2) v x = 40. m/s and v y = 30. m/s (3) v x = 20. m/s and v y = 10. m/s (4) v x = 20. m/s and v y = 30. m/s 6 A ball is thrown with an initial speed of 10. meters per second. At what angle above the horizontal should the ball be thrown to reach the greatest height? (1) 0 (3) 45 (2) 30. (4) Which object has the greatest inertia? (1) a kg bullet traveling at 90. m/s (2) a 30.-kg child traveling at 10. m/s on her bike (3) a 490-kg elephant walking with a speed of 1.0 m/s (4) a 1500-kg car at rest in a parking lot 8 An 8.0-newton wooden block slides across a horizontal wooden floor at constant velocity. What is the magnitude of the force of kinetic friction between the block and the floor? (1) 2.4 N (3) 8.0 N (2) 3.4 N (4) 27 N 9 Which situation represents a person in equilibrium? (1) a child gaining speed while sliding down a slide (2) a woman accelerating upward in an elevator (3) a man standing still on a bathroom scale (4) a teenager driving around a corner in his car 10 A rock is thrown straight up into the air. At the highest point of the rock s path, the magnitude of the net force acting on the rock is (1) less than the magnitude of the rock s weight, but greater than zero (2) greater than the magnitude of the rock s weight (3) the same as the magnitude of the rock s weight (4) zero P.S./Physics June 13 [2]

3 11 The diagram below shows a compressed spring between two carts initially at rest on a horizontal, frictionless surface. Cart A has a mass of 2 kilograms and cart B has a mass of 1 kilogram. A string holds the carts together. A B 2 kg 1 kg The string is cut and the carts move apart. Compared to the magnitude of the force the spring exerts on cart A, the magnitude of the force the spring exerts on cart B is (1) the same (3) twice as great (2) half as great (4) four times as great 12 An 8.0-newton block is accelerating down a frictionless ramp inclined at 15 to the horizontal, as shown in the diagram below. 15 Horizontal a 8.0 N Frictionless ramp What is the magnitude of the net force causing the block s acceleration? (1) 0 N (3) 7.7 N (2) 2.1 N (4) 8.0 N 13 At a certain location, a gravitational force with a magnitude of 350 newtons acts on a 70.-kilogram astronaut. What is the magnitude of the gravitational field strength at this location? (1) 0.20 kg/n (3) 9.8 m/s 2 (2) 5.0 N/kg (4) N kg 14 A spring gains 2.34 joules of elastic potential energy as it is compressed meter from its equilibrium position. What is the spring constant of this spring? (1) 9.36 N/m (3) 37.4 N/m (2) 18.7 N/m (4) 74.9 N/m 15 When a teacher shines light on a photocell attached to a fan, the blades of the fan turn. The brighter the light shone on the photocell, the faster the blades turn. Which energy conversion is illustrated by this demonstration? (1) light thermal mechanical (2) light nuclear thermal (3) light electrical mechanical (4) light mechanical chemical 16 Which statement describes a characteristic common to all electromagnetic waves and mechanical waves? (1) Both types of waves travel at the same speed. (2) Both types of waves require a material medium for propagation. (3) Both types of waves propagate in a vacuum. (4) Both types of waves transfer energy. 17 An electromagnetic wave is produced by charged particles vibrating at a rate of vibrations per second. The electromagnetic wave is classified as (1) a radio wave (3) an x ray (2) an infrared wave (4) visible light 18 The energy of a sound wave is most closely related to the wave s (1) frequency (3) wavelength (2) amplitude (4) speed 19 A sound wave traveling eastward through air causes the air molecules to (1) vibrate east and west (2) vibrate north and south (3) move eastward, only (4) move northward, only 20 What is the speed of light (f = Hz) in ethyl alcohol? (1) m/s (3) m/s (2) m/s (4) m/s P.S./Physics June 13 [3] [OVER]

4 21 In the diagram below, an ideal pendulum released from position A swings freely to position B. A B As the pendulum swings from A to B, its total mechanical energy (1) decreases, then increases (3) increases, then decreases (2) increases, only (4) remains the same 22 The diagram below represents a periodic wave. A B C D E F G H Which two points on the wave are out of phase? (1) A and C (3) C and E (2) B and F (4) D and G 23 A dry plastic rod is rubbed with wool cloth and then held near a thin stream of water from a faucet. The path of the stream of water is changed, as represented in the diagram below. Faucet Plastic rod Stream of water Which force causes the path of the stream of water to change due to the plastic rod? (1) nuclear (3) electrostatic (2) magnetic (4) gravitational P.S./Physics June 13 [4]

5 24 A distance of meter separates successive crests of a periodic wave produced in a shallow tank of water. If a crest passes a point in the tank every second, what is the speed of this wave? (1) m/s (3) m/s (2) m/s (4) m/s 31 The diagram below shows currents in a segment of an electric circuit. 5A 7A 25 One vibrating 256-hertz tuning fork transfers energy to another 256-hertz tuning fork, causing the second tuning fork to vibrate. This phenomenon is an example of (1) diffraction (3) refraction (2) reflection (4) resonance A 3A 26 Sound waves are produced by the horn of a truck that is approaching a stationary observer. Compared to the sound waves detected by the driver of the truck, the sound waves detected by the observer have a greater (1) wavelength (3) period (2) frequency (4) speed 27 The electronvolt is a unit of (1) energy (2) charge (3) electric field strength (4) electric potential difference 28 Which particle would produce a magnetic field? (1) a neutral particle moving in a straight line (2) a neutral particle moving in a circle (3) a stationary charged particle (4) a moving charged particle 29 A physics student takes her pulse and determines that her heart beats periodically 60 times in 60 seconds. The period of her heartbeat is (1) 1 Hz (3) 1 s (2) 60 Hz (4) 60 s 30 Moving 4.0 coulombs of charge through a circuit requires 48 joules of electric energy. What is the potential difference across this circuit? (1) 190 V (3) 12 V (2) 48 V (4) 4.0 V What is the reading of ammeter A? (1) 1 A (3) 9 A (2) 5 A (4) 15 A 32 An electric dryer consumes joules of electrical energy when operating at 220 volts for seconds. During operation, the dryer draws a current of (1) 10. A (3) A (2) 15 A (4) A 33 Which net charge could be found on an object? (1) C (3) C (2) C (4) C 34 A photon is emitted as the electron in a hydrogen atom drops from the n = 5 energy level directly to the n = 3 energy level. What is the energy of the emitted photon? (1) 0.85 ev (3) 1.51 ev (2) 0.97 ev (4) 2.05 ev 35 In a process called pair production, an energetic gamma ray is converted into an electron and a positron. It is not possible for a gamma ray to be converted into two electrons because (1) charge must be conserved (2) momentum must be conserved (3) mass-energy must be conserved (4) baryon number must be conserved P.S./Physics June 13 [5] [OVER]

6 Part B 1 Answer all questions in this part. Directions (36 50): For each statement or question, choose the word or expression that, of those given, best completes the statement or answers the question. Some questions may require the use of the 2006 Edition Reference Tables for Physical Setting/Physics. Record your answers on your separate answer sheet. 36 The approximate length of an unsharpened No. 2 pencil is (1) m (3) m (2) m (4) m 37 The diagram below shows an 8.0-kilogram cart moving to the right at 4.0 meters per second about to make a head-on collision with a 4.0-kilogram cart moving to the left at 6.0 meters per second. 8.0 kg 4.0 m/s 6.0 m/s 4.0 kg Frictionless, horizontal surface After the collision, the 4.0-kilogram cart moves to the right at 3.0 meters per second. What is the velocity of the 8.0-kilogram cart after the collision? (1) 0.50 m/s left (3) 5.5 m/s left (2) 0.50 m/s right (4) 5.5 m/s right 38 Four forces act concurrently on a block on a horizontal surface as shown in the diagram below. 80.N Block 120.N 100.N 80.N As a result of these forces, the block (1) moves at constant speed to the right (2) moves at constant speed to the left (3) accelerates to the right (4) accelerates to the left 39 If a motor lifts a 400.-kilogram mass a vertical distance of 10. meters in 8.0 seconds, the minimum power generated by the motor is (1) W (3) W (2) W (4) W 40 A 4.0-kilogram object is accelerated at 3.0 meters per second 2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at (1) 12 m/s 2 (3) 3.0 m/s 2 (2) 6.0 m/s 2 (4) 1.5 m/s 2 41 An electron is located in an electric field of magnitude 600. newtons per coulomb. What is the magnitude of the electrostatic force acting on the electron? (1) N (3) N (2) N (4) N 42 The current in a wire is 4.0 amperes. The time required for electrons to pass a certain point in the wire is (1) 1.0 s (3) 0.50 s (2) 0.25 s (4) 4.0 s 43 When two point charges of magnitude q 1 and q 2 are separated by a distance, r, the magnitude of the electrostatic force between them is F. What would be the magnitude of the electrostatic force between point charges 2q 1 and 4q 2 when separated by a distance of 2r? (1) F (3) 16F (2) 2F (4) 4F 44 The composition of a meson with a charge of 1 elementary charge could be (1) sc (3) ub (2) d s s (4) _ u c d P.S./Physics June 13 [6]

7 + 45 Which graph represents the relationship between the kinetic energy and the speed of a freely falling object? Kinetic Energy Kinetic Energy Kinetic Energy Kinetic Energy Speed Speed Speed Speed ( 1 ) ( 2 ) ( 3 ) ( 4 ) 46 Which diagram represents the electric field between two oppositely charged conducting spheres? ( 1 ) ( 2 ) ( 3 ) ( 4 ) 47 Which graph represents the relationship between the magnitude of the gravitational force, F g, between two masses and the distance, r, between the centers of the masses? F g F g F g F g r r r r ( 1 ) ( 2 ) ( 3 ) ( 4 ) 48 The diagram below shows two waves traveling toward each other at equal speed in a uniform medium. A B x x x When both waves are in the region between points A and B, they will undergo (1) diffraction (3) destructive interference (2) the Doppler effect (4) constructive interference P.S./Physics June 13 [7] [OVER]

8 49 The diagram below shows a series of straight wave fronts produced in a shallow tank of water approaching a small opening in a barrier. 1.4 cm Barrier Wave fronts Which diagram represents the appearance of the wave fronts after passing through the opening in the barrier? 1.4 cm 0.7 cm 1.4 cm 0.7 cm ( 1 ) ( 2 ) ( 3 ) ( 4 ) 50 The graph below represents the relationship between energy and the equivalent mass from which it can be converted. Energy Equivalent Mass The slope of this graph represents (1) c (3) g (2) c 2 (4) g 2 P.S./Physics June 13 [8]

9 Part B 2 Answer all questions in this part. Directions (51 65): Record your answers in the spaces provided in your answer booklet. Some questions may require the use of the 2006 Edition Reference Tables for Physical Setting/Physics A 25.0-meter length of platinum wire with a cross-sectional area of meter 2 has a resistance of ohm at 20 C. Calculate the resistivity of the wire. [Show all work, including the equation and substitution with units.] [2] 53 The diagram below represents a periodic wave moving along a rope. 0.2 Displacement (m) Position (m) On the grid in your answer booklet, draw at least one full wave with the same amplitude and half the wavelength of the given wave. [1] A baseball bat exerts an average force of 600. newtons east on a ball, imparting an impulse of 3.6 newton seconds east to the ball. Calculate the amount of time the baseball bat is in contact with the ball. [Show all work, including the equation and substitution with units.] [2] 56 The diagram below shows the north pole of one bar magnet located near the south pole of another bar magnet. N S On the diagram in your answer booklet, draw three magnetic field lines in the region between the magnets. [1] P.S./Physics June 13 [9] [OVER]

10 Base your answers to questions 57 through 59 on the information and graph below. The graph below shows the relationship between speed and elapsed time for a car moving in a straight line Speed vs. Time Speed (m/s) Time (s) 57 Determine the magnitude of the acceleration of the car. [1] Calculate the total distance the car traveled during the time interval 4.0 seconds to 8.0 seconds. [Show all work, including the equation and substitution with units.] [2] P.S./Physics June 13 [10]

11 Base your answers to questions 60 through 62 on the information below. A 20.-ohm resistor, R 1, and a resistor of unknown resistance, R 2, are connected in parallel to a 30.-volt source, as shown in the circuit diagram below. An ammeter in the circuit reads 2.0 amperes. 2.0 A A 30. V R 1 = 20. Ω R 2 60 Determine the equivalent resistance of the circuit. [1] Calculate the resistance of resistor R 2. [Show all work, including the equation and substitution with units.] [2] Base your answers to questions 63 through 65 on the information below. A 28-gram rubber stopper is attached to a string and whirled clockwise in a horizontal circle with a radius of 0.80 meter. The diagram in your answer booklet represents the motion of the rubber stopper. The stopper maintains a constant speed of 2.5 meters per second Calculate the magnitude of the centripetal acceleration of the stopper. [Show all work, including the equation and substitution with units.] [2] 65 On the diagram in your answer booklet, draw an arrow showing the direction of the centripetal force acting on the stopper when it is at the position shown. [1] P.S./Physics June 13 [11] [OVER]

14 Base your answers to questions 81 through 85 on the information and diagram below. A 30.4-newton force is used to slide a 40.0-newton crate a distance of 6.00 meters at constant speed along an incline to a vertical height of 3.00 meters N m F = 30.4 N 3.00 m 81 Determine the total work done by the 30.4-newton force in sliding the crate along the incline. [1] Calculate the total increase in the gravitational potential energy of the crate after it has slid 6.00 meters along the incline. [Show all work, including the equation and substitution with units.] [2] 84 State what happens to the kinetic energy of the crate as it slides along the incline. [1] 85 State what happens to the internal energy of the crate as it slides along the incline. [1] P.S./Physics June 13 [14]

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16 P.S./PHYSICS Printed on Recycled Paper P.S./PHYSICS

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