# Physics Final Exam Review 2: Question Preview (ID: 9955)

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The lines of magnetic field from a bar magnet for closed lines. By convention, the field direction is taken to be |
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a) inward from the north pole and outward to the south pole. | b) inward from the north pole and inward from the south pole. | c) outward from the north pole and inward to the south pole | d) outward from the north pole and outward to the south pole. | |

A circuit has a resistance of 2.0 ohms and a 24 V battery. What is the current? |
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a) 12 A | b) 4.0 A | c) 2.0 A | d) 0.50 A | |

Suppose the value of one resistor is 40 ohms, and the value of the second resistor is 10 ohms. What is the equivalent resistance? Req = (R x R) / (R + R) |
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a) 50 ohms | b) 8 ohms | c) 30 ohms | d) .125 ohms | |

A negative point charge placed at point A will move toward the right. |
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a) The electric field is strongest nearest point B. | b) A negative point charge placed at point A will move toward the right. | c) The charges on both B and C are positive. | d) A negative point charge placed at point A will move toward the left. | |

Demonstrate your knowledge of Coulomb's law if Q1 is 1.6 x 10^-13 C, Q2 is 1.6 x 10^-13 C, and d is 0.50 m (k = 9x10^9 N/m^2/C^2) (F=k•Q1•Q2/d^2) |
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a) 9.2 x 10^-16 N | b) 0.0827 N | c) 1.024 x 10^-25 N | d) 0.704 N | |

A positive charge attracts object X. A negative charge repels object Y. Object X is attracted to object Y. (alternation of positive and negative charges) |
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a) Object X has a positive charge. Object Y has a negative charge. | b) Object X has a negative charge. Object Y has a positive charge. | c) Object X has a positive charge. Object Y has a positive charge. | d) Object X has a neutral charge. Object Y has a negative charge. | |

A student lifts her 42kg body 0.25meters in 2seconds. How much power is she exerting? (weight=mass x gravity) (P=Fd/t) |
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a) 10.5 watts | b) 102.9 watts | c) 51.5 watts | d) 21 watts | |

You are on a roller coaster and you are momentarily lifted out of your seat when dropped at the top of a very high hill. You feel weightless because |
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a) there is no gravity at that height. | b) you are in free fall as your chair drops suddenly. | c) you are not accelerating at that point. | d) the pull of the sun balances out the pull of the Earth at that height. | |

A 4.0kg ball is moving at 6.0m/s directly toward a 2.0kg ball which is at rest. They collide and stick together. What is the velocity after the collison? vf=(m1v1+m2v2)/(m1+m2) |
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a) 4 m/s | b) 4.3 m/s | c) 3 m/s | d) 3.3 m/s | |

Which is not a way to make an electromagnet stronger? |
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a) changing the number of coils of wire | b) changing the current in the wire | c) changing the material used for the core | d) using a thicker wire | |

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