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Q#2(W06)C
Course: PHYS 312, Fall 2009School: RIT
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312 SPSP Quiz #2 (12/14/06) Winter 2006 (1) The cross product of two vectors, A and B, is maximized when (a) A and B are parallel (b) A and B are perpendicular (c) A and B have the same magnitude (d) A and B are antiparallel (2) What are the correct units for torque? (a) N (b) Nm (c) J (d ) Nm2 (e) both (b) and (c) (3) Two objects A and B have identical shapes. Object B has 3 times the mass of object A and every...
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312 SPSP Quiz #2 (12/14/06) Winter 2006
(1) The cross product of two vectors, A and B, is maximized when
(a) A and B are parallel (b) A and B are perpendicular (c) A and B have the same magnitude (d) A and B are antiparallel
(2) What are the correct units for torque? (a) N (b) Nm (c) J (d ) Nm2 (e) both (b) and (c) (3) Two objects A and B have identical shapes. Object B has 3 times the mass of object A and
every dimension of object B is 3 times as large as that of object A. Each object is of uniform density, but obviously the densities of A and B are very different! What can you say about the moment of inertia of object B compared to that of object A (about the indicated axes)? (a) IB = IA (b) IB = 3 IA (c) IB = 9 IA (d) IB = 27 IA (e) IB = 81 IA (f) without more information, nothing can be concluded!!
(4) The moment of inertia of some object is 1 kg m2 about a particular axis which passes through
its center of mass. The total mass of the object is 2 kg. I rotate the object about an axis parallel to but displaced from the previous one find and the moment of inertia to be 9 kg m2 ? How far from the center of mass is the new axis of rotation? (a) 2m (b) 4m (c) 8m (d) none of the above
(5) A hoop and solid disk both of mass M and radius R are released from rest and roll down a
ramp of height H. When they reach the bottom, which of the following statements are true? (a) The two objects have the same total kinetic energy. (b) The two objects have the same translational kinetic energy. (c) The two objects have the same rotational kinetic energy. (d) a, b, and c are all true (e) a, b, and c are all false .
TRUE OR FALSE? (6) If an object is rotating, the ne...
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