We have direct experimental evidence (from large particle accelerators) for the physical conditions in the universe back to about ________ after the Big Bang
A) 3 minutes
B) 10-10 seconds
C) 1 million years
D) 380,000 years
E) 300 years
B
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________
a. has a very large "sunspot" on its surface b. is a member of an eclipsing binary star system c. is a white dwarf d. is a Cepheid variable e. is periodically ejecting gas into space, every 93 hours
The center of the universe:
A) is the Milky Way. B) is the Sun. C) is Earth. D) is where the Big Bang happened. E) does not exist anywhere in space.
A 4.0-kg aluminum block is originally at 10°C. If 160 kJ of heat is added to the block, what is its final temperature? The specific heat capacity of aluminum is 910 J/kg ? K
A) 24°C B) 34°C C) 44°C D) 54°C
What causes the seasons?
A. the elliptical shape of Earth's equator B. the changing distance between Earth and the Sun C. Earth's spin axis is tilted from the poles of the celestial sphere D. the tilt of Earth's spin axis relative to Earth's orbit