A mass spectrometer separates
A) ions of different elements.
B) different-mass ions of the same element.
C) different-mass ions of the same speed.
D) all of the above
E) none of the above
Answer: D
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A ball with diameter 10. cm rolls without slipping on a horizontal table top. The moment of inertia of the ball is 2.2 × 10-3 kg-m2 and its translational speed is 0.45 m/s
(a) What is its angular speed about its center of mass? (b) What is its rotational kinetic energy? (c) What is its angular momentum?
We can study how galaxies evolve because
A) galaxies are transparent to visible light. B) we are really smart astronomers. C) we can watch as they interact in real time. D) the farther away we look, the further back in time we see.
Suppose that the light from the sun suddenly shut off all over the sun, precisely at noon, as measured by clocks placed near the sun. Viewed from Earth, how would this appear? (HINT: It is about 8 light-minutes to the sun.)
A) Nothing unusual would happen, as viewed from Earth. B) At noon, all sunlight would suddenly cease. C) At about 8 minutes past noon, all sunlight would suddenly cease. D) After about 8 minutes, the sun would turn into Daffy Duck. E) At about 8 minutes past noon a small black spot would appear in the center of the sun, and this black spot would rapidly spread out over the entire sun.
In common transparent media, as the frequency of light increases, the index of refraction
A) increases. B) stays constant. C) decreases. D) varies as the sine of the incident angle.