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Quiz1_solutions

Quiz1_solutions - Physics 2 Summer Session 2008 Quiz 1...

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Physics 2 – Summer Session 2008 Quiz # 1 Question 1 Let A = 4 i + 6 j and B = 2 i + k . C = A x B is given by (a) 8 i (b) 6 i – 4 j – 12 k (c) 6 i + 6 j + k (d) 6 i + 4 j + 12 k (e) none of the above (4 i + 6 j ) x (2 i + k ) = 8 ( i x i ) + 4 ( i x k ) + 12 ( j x i ) + 6 ( j x k ) = 8 (0) + 4 (- j ) + 12 (- k ) + 6 ( i ) Æ Correct answer is (b) Question 2 Two unequal masses m and 2m are attached to a thin bar of negligible mass that rotates about an axis perpendicular to the bar. When m is a distance 2d from the axis and 2m is a distance d from the axis, the moment of inertia of this combination is I. If the masses are now interchanged, the moment of inertia will be Before: I = m(2d) 2 + (2m)d 2 = 6md 2 After: I’ = (2m)(2d) 2 + md 2 = 9md 2 Æ Correct answer is (c) Question 3 A particle moves with constant velocity v . The angular momentum of this particle about the origin is zero. (b) and (c) (e) never L = r x p , where p =m v is the momentum and r

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Quiz1_solutions - Physics 2 Summer Session 2008 Quiz 1...

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