A person sits on a freely spinning lab stool (no friction). When this person extends her arms,
A) her moment of inertia decreases and her angular velocity increases.
B) her moment of inertia decreases and her angular velocity decreases.
C) her moment of inertia increases and her angular velocity increases.
D) her moment of inertia increases and her angular velocity decreases.
E) her moment of inertia increases and her angular velocity remains the same.
D
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What length of copper wire (resistivity 1.68 × 10-8 ??m) of diameter 0.15 mm is needed for a total resistance of 15 ??
A) 16 mm B) 16 cm C) 1.6 m D) 16 m E) 160 m
The Carnot engine is important because
A. it was historically the first practical heat engine. B. it shows (in principle) how one can use ideal gas processes to create a perfectly efficient engine. C. it shows (in principle) how one can use ideal gas processes to create a maximally efficient engine. D. it is the only engine that one can run in reverse as a refrigerator. E. some other reason (specify).
Fire a cannonball with enormous speed from a hypothetical cannon and it curves due to gravity. Shine a light from a flashlight parallel to the cannon and it
A) follows a straight-line path. B) curves downward as much as the cannonball. C) curves slightly upward.
Smaller worlds are more prone to atmospheric loss via impacts than large worlds because they
A) have no plate tectonics B) have weaker gravities C) are more likely to be hit D) have less internal heat