                        EOC 2009 Part 2 (22-40)
Accessed 10 June 2017 at http://www.NCpublicschools.org
released Fall 2009

 A B C D
22. An 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?
1. 0.41 m/s/s
2. 1.2 m/s/s
3. 1.4 m/s/s
4. 2.3 m/s/s
 A B C D
23. Which pair of graphs represent the correct relationship between displacement and the velocity of a moving object?
1. 2. 3. 4. A B C D
24. The graph represents the position of a cart as a function of time. What is the velocity at 6 seconds?
1. 0.33 m/s
2. 0.43 m/s
3. 0.50 m/s
4. 1.0 m/s
 A B C D
25. An object travels around a 120-m radius circular path at a constant 70 m/s. The centipetal force on the object is 3.5 × 104 N. What is the mass of the object?
1. 4.17 × 100 kg
2. 8.57 × 102 kg
3. 6.00 × 104 kg
4. 1.43 × 106 kg
 A B C D
26. A 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. 1.3 m/s
2. 2.2 m/s
3. 2.5 m/s
4. 2.8 m/s
 A B C D
27. A ball is thrown with a velocity of 12.0 m/s at an angle 30.0° above horizontal. Ignoring air resistance, what is the ballâ€™s vertical component of velocity?
1. 6.00 m/s
2. 6.93 m/s
3. 10.4 m/s
4. 20.8 m/s
 A B C D
28. A 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?
1. 2.3 m/s
2. 4.5 m/s
3. 6.3 m/s
4. 21 m/s
 A B C D
29. The diagram represents a block with two applied forces. Ignoring friction, how much force pulls the object to the left?
1. 120 N
2. 350 N
3. 620 N
4. 720 N
 A B C D
30. This diagram represents a 1.9-kg object in static equilibrium hanging from two strings, I and II. What is the force on string II?
1. 28 N
2. 21 N
3. 19 N
4. 17 N
 A B C D
31. A 3.0 × 103-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?
1. 1.5 × 101 N
2. 1.5 × 103 N
3. 6.0 × 103 N
4. 6.0 × 103 N
 A B C D
32. A ball is released from the top of an inclined plan as shown below. Ignoring friction, where will the potential energy (PE) and kinetic energy (KE) of the ball be at a maximum?
1. PE at J, KE at M
2. PE at K, KE at L
3. PE at L, KE at K
4. PE at M, KE at J
 A B C D
33. A 588-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?
1. 2.81 × 105 J
2. 9.17 × 105 J
3. 1.83 × 106 J
4. 2.75 × 106 J
 A B C D
34. A 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?
1. 350 W
2. 890 W
3. 3,400 W
4. 6,900 W
 A B C D
35. A 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?
1. 360 J
2. 720 J
3. 1,100 J
4. 1,400 J
 A B C D
36. The diagram represents two pulses moving toward each other on a rope. What occurs when the pulses meet?
1. 2. 3. 4. A B C D
37. A 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?
1. 22.5°
2. 30.6°
3. 42.6°
4. 48.8°
 A B C D
38. This diagram represents a wave. If each point on the wave takes 0.020 s to travel from X to Y, what s the period of the wave?
1. 0.0080 s
2. 0.045 s
3. 0.18 s
4. 0.26 s
 A B C D
39. If all bulbs and power sources shown are identical, which circuit contains only 2 lit bulbs?
1. 2. 3. 4. A B C D
40. The diagram represents a DC circuit. What is the total resistance of the circuit?
1. 25 Ω
2. 28 Ω
3. 39 Ω
4. 58 Ω Additional North Carolina Exam Questions