Which force causes the path of the stream of water to change due to the plastic rod? A) nuclear B) magnetic C) electrostatic D) gravitational

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1 1. A positively charged rod is held near the knob of a neutral electroscope. Which diagram best represents the distribution of charge on the electroscope? A) B) C) D) 2. A charged electroscope can detect A) positive charge, only B) negative charge, only C) either positive or negative charge D) neither positive nor negative charge 3. A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod A) gains electrons B) gains protons C) loses electrons D) loses protons 4. Which procedure will give an electroscope a positive charge? A) touching the electroscope with a neutral object B) bringing a positively charged object near the electroscope C) touching the electroscope with a negatively charged object D) touching the electroscope with a positively charged object 5. 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 A) charge must be conserved B) momentum must be conserved C) mass-energy must be conserved D) baryon number must be conserved 6. Two objects, A and B are rubbed together. If object A acquires an excess of 100 electrons object B must have A) gained 100 electrons B) gained 100 protons C) lost 100 electrons D) lost 100 protons 7. A glass rod is given a positive charge by rubbing it with silk. The rod has become positive by A) gaining electrons B) gaining protons C) losing electrons D) losing protons 8. Which net charge could be found on an object? A) C B) C C) C D) C 9. A subatomic particle could have a charge of A) C B) C C) C D) C

2 10. An object possessing an excess of electrons has a net charge of magnitude A) C B) C C) C D) C 11. 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. Which force causes the path of the stream of water to change due to the plastic rod? A) nuclear B) magnetic C) electrostatic D) gravitational

3 12. The diagram below shows three neutral metal spheres, x, y, and z, in contact and on insulating stands. 13. Objects A and B are charged as shown in the diagram. A and B are brought together and touched. Which is the correct distribution of charge after the two objects have been separated? Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it? A) A) B) C) D) B) C) D)

4 14. In the diagram below, an ideal pendulum released from position A swings freely to position B. As the pendulum swings from A to B, its total mechanical energy A) decreases, then increases B) increases, only C) increases, then decreases D) remains the same 15. As a ball falls freely (without friction) toward the ground, its total mechanical energy A) decreases B) increases C) remains the same 16. Base your answer to the following question on the diagram below which represents a block with initial velocity v1 sliding along a frictionless track from point A through point E. The kinetic energy of the block will be greatest when it reaches point A) A B) B C) C D) D

5 17. An object is thrown vertically upward. Which pair of graphs best represents the object's kinetic energy and gravitational potential energy as functions of its displacement while it rises? A) B) C) D) 18. Energy is measured in the same units as A) force B) momentum C) work D) power 19. The diagram below shows a moving, 5.00-kilogram cart at the foot of a hill 10.0 meters high. For the cart to reach the top of the hill, what is the minimum kinetic energy of the cart in the position shown? [Neglect energy loss due to friction.] A) 4.91 J B) 50.0 J C) 250. J D) 491 J

6 20. Base your answer to the following question on the diagram below. Which represents a 2.0-kilogram mass placed on a frictionless track at point A and released from rest. Assume the gravitational potential energy of the system to be zero at point E. As the mass travels along the track, the maximum height it will reach above point E will be closest to A) 10. m B) 20. m C) 30. m D) 40. m 21. A 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 magnitude of 20. kilogram meters per second, the rifle will recoil with a momentum having a magnitude of A) 1,600 kg m/s B) 80. kg m/s C) 20. kg m/s D) 0.25 kg m/s 22. A 2.0-kilogram ball traveling north at 4.0 meters per second collides head on with a 1.0-kilogram ball traveling south at 8.0 meters per second. What is the magnitude of the total momentum of the two balls after collision? A) 0 kg-m/s B) 8.0 kg-m/s C) 16 kg-m/s D) 32 kg-m/s 23. The diagram below shows two carts initially at rest on a horizontal frictionless surface being pushed apart when a compressed spring attached to one of the carts is released. 24. In the diagram below, a 100.-kilogram clown is fired from a 500.-kilogram cannon. If the clown's speed is 15 meters per second after the firing, the recoil speed (v) of the cannon is A) 75 m/s B) 15 m/s C) 3.0 m/s D) 0 m/s 25. A bullet traveling at meters per second is brought to rest by an impulse of 50. Newton-seconds. What is the mass of the bullet? A) kg B) kg C) l kg D) kg If the 1.0-kilogram cart moves to the left with a speed of 6.0 meters per second, then the 2.0-kilogram cart moves to the right with a speed of A) 6.0 m/s B) 2.0 m/s C) 3.0 m/s D) 12 m/s

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