What color are the star clusters in the spiral arms and what does that mean?
A.) Red and that means they are old.
B.) Red and that means they have just formed recently.
C.) Blue and that means they are old.
D.) Blue and that means they have just formed recently.
E.) Black and that means they are covered by dust.
Ans: D.) Blue and that means they have just formed recently.
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Nuclear fission is the process by which
A) a number of smaller nuclei combine to form a larger nucleus with the release of energy B) electrons are rearranged inside an atom, releasing energy C) an electron is ejected from the nucleus of an atom, releasing energy D) large nuclei break up into smaller nuclei with the release of energy
What are the shared common characteristics of the Moon and Mercury?
What will be an ideal response?
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. 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.
A straight wire is carrying a current of 2.0 A. It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N, what is the length of the wire?
A) 1.0 m B) 1.2 m C) 1.4 m D) 1.6 m E) 1.8 m