When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
A. can be increased by shifting mass out away from the axis of rotation.
B. can be decreased by shifting mass out away from the axis of rotation.
C. can be increased by shifting mass in toward the axis of rotation.
D. can be decreased by shifting mass in toward the axis of rotation.
E. cannot be changed except by friction at the point of contact.
Answer: E
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The nearest star system closest to our Sun is about
A) 4 light years away. B) 20 light years away. C) 100 light years away. D) 40,000 light years away.
Suppose we have determined the orbital period of a planet around its star. If we also know the mass of the star, then we can use the planet's orbital period and the star's mass to calculate
A) the planet's average orbital distance. B) mass of the planet. C) eccentricity of the planet's orbit. D) radius of the planet.
If, for an ideal heat engine, QH, QC, and W are, respectively, the heat absorbed, the heat exhausted, and the work done per cycle, which of these is true?
A. QH cannot be more than W B. W cannot be more than QC C. QC cannot be more than QH D. QH cannot be more than QC
The four fundamental forces in nature are the __________, __________, __________, and __________
Fill in the blank(s) with correct word