# 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: HorizontallyConvenienceExplanationNegative ChargesAccelerationTotal Charge+x DirectionPositive ChargeElectric ForceFollowing Statements

## 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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