You are feeling like spaghetti. Although normally only about 2 meters tall, you are now about 25 meters long
(How fortunate, if painful, that the being has arranged for your body to become elastic enough so that it is not ripped apart under these conditions.) As you look up over your head, you see things moving pretty quickly in the universe—but that lasts only for a brief instant, and then all contact with the universe is lost. Where are you? A) You are plunging into the Sun.
B) You are crossing the event horizon of a black hole.
C) You are being consumed by a "crack" in the universe caused by inflation.
D) You are near the center of a star that has just developed an iron core, leading to a supernova.
E) You are in a medieval torture chamber somewhere in western Europe.
B
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Which of the following observations would tell us that there are intergalactic clouds of cool gas between a distant quasar and us?
A) We see hydrogen emission lines at redshifts smaller than that of the quasar. B) We see hydrogen absorption lines at redshifts smaller than that of the quasar. C) We see hydrogen emission lines at redshifts greater than that of the quasar. D) We see hydrogen absorption lines at redshifts greater than that of the quasar. E) We see that the emission lines from the quasar are lessened by intervening gas and dust.
A mass suspended from a spring bobs up and down one complete cycle every 2 s. Its period is
A) 0.5 s. B) 1 s. C) 2 s. D) none of the above
In the SI, weight is expressed in units of ______________
Fill in the blank(s) with correct word
What atmospheric constituent is responsible for the blue color of Uranus and Neptune?
A) methane B) hydrogen C) water D) ammonia