____ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy
a. Spiral galaxies
b. Barred spiral galaxies
c. Elliptical galaxies
d. Irregular galaxies
e. S0 galaxies
B
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The ________ occurs when a rapidly rotating conductor is stirred by convection to produce a magnetic field
a. dynamo effect b. Zeeman effect c. Babcock effect d. proton-proton chain e. aurora
Suppose the star Sirius were moved to a distance 7 times closer to Earth than it is now. How would its parallax angle change?
A) It would stay the same. B) It would get smaller. C) It would get larger.
The temperature of a gas is most closely related to:
A. the kinetic energy of translation of its molecules B. its total molecular kinetic energy C. the sizes of its molecules D. the potential energy of its molecules E. the total energy of its molecules
A container with a one-liter capacity at 27° C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 10^5 N/m2.) How many moles of helium does it hold?
a. 0.041 b. 0.081 c. 0.45 d. 0.90 e. 1.0