Kepler's first law of planetary motion defied what long-held belief with ancient astronomers?
a. a heliocentric Universe
b. a geocentric Universe
c. uniform circular motion
d. parallax of newborn stars
e. perfection of the heavens
c
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How do we know what happens at the event horizon of a black hole?
A) Physicists have created miniature black holes in the lab. B) Astronomers have sent spacecraft through the event horizon of a nearby black hole. C) Astronomers have analyzed the light from matter within the event horizon of many black holes. D) Astronomers have detected X-rays from accretion disks around black holes. E) We don't know for sure: we only know what to expect based on the predictions of general relativity.
A series LRC ac circuit has a peak voltage of 111 V and a peak current of 2.00 A. If the current lags the voltage by 35.0?, what is the average power of the circuit?
A) 91 W B) 182 W C) 78 W D) 156 W
A massive star can fuse more and more massive nuclei, but this process is limited by the fact that, at some point, an element that is produced ____
a. becomes completely degenerate in the core, changing the pressure-temperature relationship b. cannot produce energy through fusion c. will only fuse in the presence of even more massive nuclei d. is not found in nature e. decays radioactively before it can undergo fusion
Mars has a weak magnetic field
Indicate whether the statement is true or false