PhysicsLAB NY Regents Exams
June 1997, Part 2

Constants        Formulas

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21. A cart of mass M on a frictionless track starts from rest at the top of a hill having a height h size="3">1, as shown in the diagram below.

What is the kinetic energy of the cart when it reaches the top of the next hill, having height h size="3">2?
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22. When a plastic rod is rubbed with wool, the wool acquires a positive charge because
  1. electrons are transferred from the wool to the rod
  2. protons are transferred from the wool to the rod
  3. electrons are transferred from the rod to the wool
  4. protons are transferred from the rod to the wool
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23. Three identical metal spheres are mounted on insulating stands. Initially, sphere A has a net charge of q and spheres B and C are uncharged. Sphere A is touched to sphere B and removed. Then sphere A is touched to sphere C and removed. What is the final charge on sphere A?
  1. q
  2. q /2
  3. q /3
  4. q /4
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24. A distance of 1.0 x 103 meters separates the charge at the bottom of a cloud and the ground. The electric field intensity between the bottom of the cloud and the ground is 2.0 x 104 newtons per coulomb. What is the potential difference between the bottom of the cloud and the ground?
  1. 1.3 x 1023 V
  2. 2.0 x 101 V
  3. 2.0 x 107 V
  4. 5.0 x 10-2 V
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25. The diagram below shows proton P located at point A near a positively charged sphere.

If a 6.4 x 10-19 joule of work is required to move the proton from point A to point B, the potential difference between A and B is

  1. 6.4 x 10 -19 V
  2. 4.0 x 10 -19 V
  3. 6.4 V
  4. 4.0 V
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26. What is the net static electric charge on a metal sphere having an excess of +3 elementary charges?
  1. 1.6 x 10 -19 C
  2. 4.8 x 10 -19 C
  3. 3.0 x 100 C
  4. 4.8 x 1019 C
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27. The diagram below shows currents in a segment of an electric circuit.

What is the reading of ammeter A?

  1. 8 A
  2. 2 A
  3. 3 A
  4. 13 A
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28. An operating lamp draws a current of 0.50 ampere. The amount of charge passing through the lamp in 10. seconds is
  1. 0.050 C
  2. 2.0 C
  3. 5.0 C
  4. 20. C
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29. Which graph below best represents the relationship between the resistance of a copper wire of uniform cross-sectional area and the wire's length at constant temperature?

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30. Which is a vector quantity?
  1. electric charge
  2. electrical resistance
  3. electrical potential difference
  4. electric field intensity
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31. To increase the brightness of a desk lamp, a student replaces a 60-watt light bulb with a 100-watt light bulb. Compared to the 60-watt bulb, the 100-watt bulb has
  1. less resistance and draws more current
  2. less resistance and draws less current
  3. more resistance and draws more current
  4. more resistance and draws less current
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32. An electric dryer consumes 6.0 x 106 joules of energy when operating at 220 volts for 30. minutes (1800 seconds). During operation, the dryer draws a current of approximately
  1. 10. A
  2. 15 A
  3. 20. A
  4. 25 A
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33. The diagram below shows a compass placed near the north pole, N, of a bar magnet.

Which diagram best represents the position of the needle of the compass as it responds to the magnetic field of the bar magnet?
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34. The diagram below represents the magnetic field around point P, at the center of a current-carrying wire.

What is the direction of electron flow in the wire?

  1. from A to B
  2. from B to A
  3. from P into the page
  4. from P out of the page
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35. The diagram below represents a straight conductor between the poles of a permanent magnet.

If electrons flow within the conductor in the direction shown, then the magnetic force on the conductor is directed

  1. toward N
  2. toward S
  3. into the page
  4. out of the page
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36. The diagram below shows a transverse wave moving to the right along a rope.

As the wave passes point X, the motion of X will be

  1. up, then down
  2. down, then up
  3. left, then right
  4. in a circle
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37. The frequency of a light wave is 5.0 x 1014 hertz. What is the period of the wave?
  1. 1.7 x 106 s
  2. 2.0 x 10-15 s
  3. 6.0 x 10-7 s
  4. 5.0 x 10-14 s
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38. The amplitude of a sound wave is to its loudness and the amplitude of a light wave is to its
  1. brightness
  2. frequency
  3. color
  4. speed
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39. The speed of light in glycerol is approximately
  1. 1.0 x 107 m/s
  2. 2.0 x 108 m/s
  3. 3.0 x 108 m/s
  4. 4.4 x 108 m/s
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40. In the diagram below, a water wave having a speed of 0.25 meter per second causes a cork to move up and down 4.0 times in 8.0 seconds.

What is the wavelength of the water wave?

  1. 1.0 m
  2. 2.0 m
  3. 8.0 m
  4. 0.50 m




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