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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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