Although the Sun's core has a density much greater than rock, it is considered a gaseous object because
A. the Sun formed from the Solar nebula which itself was a large gas and dust cloud.
B. the Sun's high internal temperature prevent the atoms from bonding together to form a liquid or a solid.
C. it is composed mostly of hydrogen.
D. a large fraction of the Sun's interior is made of electromagnetic radiation (light).
Answer: B
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An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively
a. ?q, ?q. b. ?q, +q. c. +q, ?q. d. +q, +q. e. +q, 0.
A capacitor C is connected in series with a resistor R across a battery and an open switch. If a second capacitor of capacitance 2C is connected in parallel to the first, the time constant of the new RC circuit will be
A) the same as before. B) twice as large as before. C) three times a large as before. D) one-half as large as before. E) one-fourth as large as before.
What spectral type of star that is still around formed most recently?
A) O B) A C) F D) K E) M
Whose geocentric model of the Universe dominated astronomy for 2,000 years?
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