# Test Booklet. Subject: SC, Grade: HS 2008 Grade High School Physics. Student name:

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1 Test ooklet Subject: S, Grade: HS 2008 Grade High School Physics Student name: uthor: North arolina istrict: North arolina Released Tests Printed: Monday July 09, 2012

2 1 n object is launched across a room. How can a student determine the average horizontal velocity of the object using a meter stick and a calculator? The student can calculate the object s initial potential energy and then calculate the velocity from conservation of energy principle. The student can measure the recoil distance of the throwing mechanism and then calculate the velocity from conservation of momentum principle. The student can measure the horizontal travel distance, compute the flight time from the vertical drop, and then calculate the average horizontal velocity. The student can measure the fall distance and the travel time from the horizontal displacement and then calculate the average horizontal velocity. 2 The graph shows the acceleration of a car over time. If the car starts from rest, what is the velocity of the car after 5.0 seconds? 0 m/s 0.80 m/s 4.0 m/s 20. m/s 3 car travels at a constant speed on a flat, circular track. Which factor, when doubled, will decrease the centripetal force on the car? mass of the car weight of the car velocity of the car radius of the track 4 Neglecting air resistance, if a ball is thrown 4.5 m/s horizontally from a 94-m cliff, how far has the ball fallen after 2.7 s? 36 m 48 m 58 m 71m Page 1

3 5 Which graph represents the relationship between the gravitational acceleration of a falling body and the mass of the body? 6 These diagrams represent two examples of signs hanging from identical ropes. Which example would most likely be able to support the heaviest sign? example I, because the ropes exert the greatest horizontal force on the sign example II, because the ropes exert the greatest horizontal force on the sign example I, because the ropes exert the greatest vertical force on the sign example II, because the ropes exert the greatest vertical force on the sign Page 2

4 7 horizontal force acts on a block sliding on a horizontal surface. The force of kinetic friction between the block and the surface is 0.5 F. If the direction of the applied force is reversed, which is true? The magnitude of the net force on the block increases. The magnitude of the acceleration of the block remains the same. The kinetic energy of the block increases. The velocity of the block remains the same N east horizontal force acts in the same direction as a 6.4-kg block as it slides 2.5 m/s on a frictionless, horizontal surface for 2.1 s. What is the speed of the block after force is applied? 1.7 m/s 4.3 m/s 6.7 m/s 7.2 m/s 11 The chart represents the work output and the time to do the work for four machines. 8 rope horizontally pulls a massive object lying on a surface with friction with a constant velocity. What describes the force on the rope? equal to the frictional force greater than the frictional force equal to the weight of the object greater than the weight of the object 9 What is the difference in momentum between a 53-kg athlete running 3.58 m/s and a 880.-kg car traveling 1.03 m/s? 130 kg m/s 720 kg m/s 1,100 kg m/s 2,100 kg m/s For which machine is the power output least? I II III IV N force is used to compress a spring. The spring constant of the spring is 5,880 N/m. How far is the spring compressed? m m 0.31 m 20. m Page 3

5 13 Figure 1 represents a pendulum. Figure 2 represents the motion of the pendulum as a wave. Points Z and W are the highest positions of the swinging mass. Point Y is halfway between points X and Z. Which graph represents the potential energy of the swinging mass at different points? 14 What is the maximum velocity at which a 25-W motor can lift a 8.5-kg object upward? 0.30 m/s 2.9 m/s 7.6 m/s 29 m/s 15 What is the frequency of a wave with a speed of 10 m/s and wavelength of 20 m? 0.5 Hz 2 Hz 30 Hz 200 Hz Page 4

6 16 The frequency of a wave is Hz. The speed of a wave in a certain medium is m/s. What is the index of refraction of the medium? n object produces a sound with constant frequency as the object moves from X to Y. Which diagram represents the pattern of the sound? Page 5

7 18 The diagram represents a circuit. What is the voltage of the battery when the ammeter reads 4.0 amperes? 0.22 V 1.0 V 4.5 V 16V 19 student combs his hair with a plastic comb, and the hair becomes positively charged. What is the net charge of the comb and the hair and the direction of the charge transfer? Protons move from the comb to the hair, and the total charge of the hair and the comb is zero. Electrons move from the hair to the comb, and the total charge of the hair and the comb is zero. Protons move from the comb to the hair, and the total charge of the hair and the comb is positive. Electrons move from the hair to the comb, and the total charge of the hair and the comb is negative. Page 6

8 20 student wants to measure the current flowing through and the voltage across R 1 in the circuit. Which configuration is correct? 21 n athlete running 2.6 m/s increases his velocity to 3.7 m/s in 2.7 s. What is the acceleration of the runner? 0.41 m/s/s 1.2 m/s/s 1.4 m/s/s 2.3 m/s/s Page 7

9 22 Which pair of graphs represent the correct relationship between displacement and the velocity of a moving object? Page 8

10 23 The graph represents the position of a cart as a function of time. 26 ball is thrown with a velocity of 12.0 m/s at an angle 30.0 above horizontal. Ignoring air resistance, what is the ball s vertical component of velocity? 6.00 m/s 6.93 m/s 10.4 m/s 20.8 m/s What is the velocity at 6 seconds? 0.33 m/s 0.43 m/s 0.50 m/s 1.0 m/s 24 n object travels around a 120-m radius circular path at a constant 70 m/s. The centripetal force on the object is kg N. What is the mass of the object? kg kg kg kg 25 boat moves 2.5 m/s north across a river flowing 1.2 m/s east. What is the speed of the boat relative to the shore? 1.3 m/s 2.2 m/s 2.5 m/s 2.8 m/s 27 student pushes a 35-kg block on a frictionless, horizontal surface with a horizontal force of 18 N. If the block is initially at rest, what is the speed of the block after the student pushes the block 20.1 m? 2.3 m/s 4.5 m/s 6.3 m/s 21 m/s 28 The diagram represents a block with two applied forces. Ignoring friction, how much force pulls the object to the left? 120 N 350 N 620 N 720 N Page 9

11 29 This diagram represents a 1.9-kg object in static equilibrium hanging from two strings, I and II. 31 ball is released from the top of an inclined plane as shown below. Ignoring friction, where will the potential energy (PE) and kinetic energy (KE) of the ball be at a maximum? What is the force on string II? 28 N 21 N 19 N 17 N kg truck traveling at 20.0 m/s in a test laboratory collides into a wall and comes to rest in 0.10 s. What is the magnitude of the average force acting on the truck during the collision? N N N N PE at J, KE at M PE at K, KE at L PE at L, KE at K PE at M, KE at J N person carrying 294 N of equipment starts climbing a mountain that is 3,118 m high. What is the minimum energy required for the person to climb the mountain? J J J J 33 machine lifts a 35-kg object 20.0 m in 2.0 s. How much power is produced by the machine to lift the object? 350 W 890 W 3,400 W 6,900 W Page 10

12 34 student throws an object downward. The initial kinetic energy of the object is 360 J. When the object reaches the ground, the kinetic energy of the object is 3 times the initial kinetic energy of the object. What was the initial potential energy of the object? 360 J 720 J 1,100 J 1,400 J Page 11

13 35 The diagram represents two pulses moving toward each other on a rope. What occurs when the pulses meet? 36 light ray traveling through air is incident on a pool of water. If the light has an angle of incidence of 30.6, what is the angle of refraction in the water? This diagram represents a wave. If each point on the wave takes s to travel from X to Y, what is the period of the wave? s s 0.18 s 0.26 s Page 12

14 38 If all bulbs and power sources shown are identical, which circuit contains only 2 lit bulbs? 39 The diagram represents a circuit. What is the total resistance of the circuit? 40 Two charged particles are m apart. They are moved until the force between them is 16 times greater. How far apart are the charges? m m m 0.16 m Page 13

15 41 The graph represents the motion of a car moving linearly. 43 car travels at 11 m/s east for 61 s, then travels at 25 m/s east for 31 s. What is the average velocity of the car? 8.5 m/s east 16 m/s east 18 m/s east 36 m/s east 44 n object moves in uniform circular motion, and the centripetal force on the object is 4.0 N. If the mass of the object decreases by a factor of 2, what will be the centripetal force on the object? When is the car moving backwards? 0 s to 10 s 20 s to 40 s 40 s to 50 s 50 s to 60 s 1.0 N 2.0 N 8.0 N 16 N 42 The average speed of a cart during a 15-s interval is 3.0 m/s. What is the total distance traveled by the cart? 0.20 m 5.0 m 18m 45m Page 14

16 45 The objects shown are moving in a horizontal, uniform, circular motion. Which object experiences the least centripetal force? N person pulls a rope tied to a tree. If the person pulls the rope with a force of 120 N, what is the magnitude of the reaction force on the rope? 120 N 610 N 730 N 850 N 47 The diagram represents forces acting on a block that accelerates 6.0 m/s/s on a frictionless surface. What is the mass of the block? 2.0 kg 4.0 kg 12 kg 72 kg kg block rests on a plane inclined at 35 to the horizontal. What is the frictional force acting on the block? 11 N 15 N 22 N 26 N Page 15

17 49 2-kg body of mass is moving on a horizontal frictionless surface with a velocity of 4 m/s. What is the net force required to keep the body moving with the same velocity and direction for 5 s? 0 N 2 N 8 N 20 N 50 n object has a mass, m, and velocity, v. Which change would make its momentum become onefourth as much? Its mass becomes m 2 v. 2, and its velocity becomes Its mass becomes m, and its velocity becomes v. 2 Its mass becomes m, and its velocity becomes 3 v. Its mass becomes m, and its velocity becomes 2 2v kg object traveling 15 m/s collides with and sticks to a 315-kg object initially at rest. What is the final velocity of the two objects? 2.9 m/s 3.6 m/s 12 m/s 19 m/s 52 How much power is required to lift a 12-N box at 4.5 m/s? 2.6 W 5.4 W 44 W 54 W 53 student drops a 0.45-kg ball that hits the floor with a speed of 5.3 m/s. If the velocity of the ball is 4.8 m/s when it hits the floor on the second bounce, how much mechanical energy is lost during the first bounce? 0 J 1.1 J 4.8 J 6.3 J 54 pendulum swings back and forth up to a maximum height of 1.52 m. Neglecting friction, what is the speed of the pendulum at the lowest position? 2.7 m/s 3.9 m/s 5.5 m/s 30. m/s Page 16

18 55 The diagram represents two pulses traveling toward each other. Which represents what happens when the pulses meet? Page 17

19 56 This graph represents a wave created by a student who hits a 220-Hz tuning fork with a certain force. The student hits a 440-Hz tuning fork with the same force. Which graph represents the new wave? 57 student places a piece of glass over a tank of water. What happens to the speed of a light ray that shines from air through glass into the water? increases in glass and water decreases in glass and water increases in glass, then decreases in water decreases in glass, then increases in water Page 18

20 58 In these diagrams, all light bulbs are identical. In which circuit would the light bulbs be the dimmest? 60 This diagram represents a circuit. Each resistor has a value of 5.1. If R 3 is removed from the circuit, how much current will flow through the circuit? What happens when a positively charged rod touches a neutral metal sphere? Protons move from the sphere to the rod. Protons move from the rod to the sphere. Electrons move from the sphere to the rod. Electrons move from the rod to the sphere. Page 19 STOP

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