Tides are influenced by
a. the moon
b. the sun
c. the uneven surface of the earth
d. all of the above
e. none of the above
D
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A star of apparent magnitude ________ appears 2.51 times brighter than a star of apparent magnitude 4.
A. 10 B. 3 C. 1 D. 6.51 E. 1.49
Why will it be hard to determine the nature of Venus' interior?
A) No orbiter has been able to find the exact mass of Venus. B) No seismograph can last long enough at Venus' temperatures to pick up quakes. C) No photos have ever been returned from Venus' surface. D) The clouds prevent us from finding the exact diameter and volume of Venus. E) The magnetic field of Venus is much stronger than our own.
The most important fact about a cluster of stars that makes them useful for studying star formation is that
A) all the stars formed from the same cloud. B) all the stars formed at about the same time. C) all the stars are at the same distance from Earth. D) all the stars have the same chemical composition. E) all the stars are the same spectral type.
A lab student drops a 400.0-g piece of metal at 120.0°C into a cup containing 450.0 g of water at 15.0°C. After waiting for a few minutes, the student measures that the final temperature of the system is 40.0°C
What is the specific heat of the metal, assuming that no significant heat is exchanged with the surroundings or the cup? The specific heat of water is 4186 J/kg ? K. A) 1470 J/kg ? K B) 2830 J/kg ? K C) 3420 J/kg ? K D) 3780 J/kg ? K E) 4280 J/kg ? K