A flywheel is used to minimize changes in rotational velocity as the torque or the load changes. The rotational inertia of a flywheel should be chosen to be
A. as small as possible.
B. as large as possible.
C. anything-it doesn't matter.
Answer: B
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The Galileo spacecraft dropped a probe into Jupiter's atmosphere that survived to a depth of about 200 kilometers, or 0.3% of Jupiter's radius. Which is the deepest layer in which this probe was able to make measurements?
A) the gaseous hydrogen layer B) the liquid hydrogen layer C) the metallic hydrogen layer D) the core
A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have
A) equal temperatures. B) your temperature. C) equal conductivities. D) none of the above
A kg of 40°C water and a kg of 20°C water, after being mixed, have a temperature of 30°C. However, the final temperature of a 1-kg iron block at 40°C placed into 1 kg of water at 20°C is
A) less than 30°C. B) at or about 30°C. C) more than 30°C.
Two masses m1 and m2, having m1 > m2, are launched with the same speed in the direction b. Which mass reaches the greatest height?