The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the Local Group
a. I and III
b. I and IV
c. II and III
d. II and IV
e. just III
b
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The two smallest planets, Mercury and Pluto, have no moons
Indicate whether the statement is true or false
The luminosity of the white dwarf supernova 175 days after it reaches peak brightness is about ________ of its luminosity at peak brightness.
A) 30% B) 10% C) 3% D) 1%
The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature __________
Fill in the blank(s) with correct word
An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.