The Solar System is located about ________ from the center of the Milky Way.
A. 8 light-years
B. 8 kiloparsecs
C. 8 parsecs
D. 8 AU
Answer: B
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In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
Which of the following is a true "wave," as physicists define the term?
A) light B) water flowing downhill in a mountain stream C) ocean waves coming into a beach D) None of the above. E) All of the above.
Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
A. 2.0 A B. 1.0 A C. 3.0 A D. 9.0 A E. 1.5 A
A changing electric field induces a changing
A) magnetic field. B) electromagnetic field. C) both of these D) neither of these