A mirror has a focal length -20 cm. If an object is placed 10 cm in front of the mirror, where will the image form?
A. 20 cm in front of the mirror
B. 20 cm behind the mirror
C. 6.7 in from of the mirror
D. 6.7 behind the mirror
E. no image will form
D. 6.7 behind the mirror
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If the Universe is closed and finite, then
a. the Universe will expand forever. b. the Universe has a center. c. the Universe has an edge. d. None of the other choices are correct.
Stars support their weight by generating ____
a. magnetic fields throughout the star b. magnetic fields throughout the star c. energy in their centers d. magnetic-plasmas at their core e. energy-plasmas at their core
About 500 stars can be seen by the naked eye from somewhere on Earth
Indicate whether the statement is true or false
Torque: Which of the following are units for the magnetic moment? (There could be more than one correct choice.)
A. 
B. A ? m2
C. N ? m/T
D. T/m2