The metal in a chunk of copper or iron is composed of
A) crystals.
B) non-crystalline fibers.
C) amorphous particles.
D) none of the above
Answer: A
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Significant Figures: What is 0.2052/3, to the correct number of significant figures?
A. 0.348 B. 0.35 C. 0.3 D. 0.3477
A squat refrigerator magnet sits on a table with its north pole facing up and its south pole down. We push a ring of wire lying on the table directly toward the magnet. What direction does current flow in the ring when viewed from above? (A wooden table will not affect the magnet’s field.)
A. Clockwise B. Counterclockwise C. No current flows in the loop.
An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
a. 35 m/s b. 25 m/s c. 30 m/s d. 21 m/s e. 17 m/s
A 6.00 kg mass is located at (2.00 m, 2.00 m, 2.00 m) and a 5.00 kg mass is located at (–1.0 m, 3.00 m,–2.00 m). If this system of masses rotated about the X-axis perpendicular to the Z-Y plane, then the moment of inertia of this system is
A. 281 kg 
B. 167 kg
C. 113 kg
D. 85 kg
E. 69 kg