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Past Exam for PHYS 1120 - GENERAL PHYSICS 2 at Colorado (CU)

Exam Information

Material Type:Exam 1
Professor:Staff
Class:PHYS 1120 - GENERAL PHYSICS 2
Subject:Physics
University:University of Colorado - Boulder
Term:Fall 2007
Keywords:
  • Horizontally
  • Convenience
  • Explanation
  • Negative Charges
  • Acceleration
  • Total Charge
  • +x Direction
  • Positive Charge
  • Electric Force
  • Following Statements
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Sample Document Text

1 Exam I, vers. 0002 - Physics 1120 - Fall, 2007 Vers.0002 2 1. Two boxes of unequal masses M1 and M2 have been placed on a flat frictionless surface some distance away from each other, and given unequal positive charges Q1 and Q2. The first box is heavier than the second, M1 > M2, however the charge on the first box is smaller, Q1 < Q2. Which of the following statements are true? By Newton's third law, the force acting on each box is the same regardless of its charge. Thus the lighter box has bigger acceleration. A) Both boxes start accelerating, and the first one (M1) has bigger acceleration. B) Both boxes start accelerating, and the second one (M2) has bigger acceleration. C) The accelerations are equal and nonzero. D) Neither of the boxes accelerate. E) None of the above 2. A balloon of mass M has been positively charged (so that its charge is Q) and placed next to a vertical blackboard, as shown. The blackboard polarizes, so the balloon sticks to it. The friction coefficien...

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