What is the total mass of a binary star system with P = 20 yr and a = 10 AU?
a. 2 solar masses
b. 2.5 solar masses
c. 0.5 solar mass
d. 80 solar masses
e. 0.4 solar mass
b
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What is the cause of the lobes in a double-lobed radio galaxy?
What will be an ideal response?
Ten parsecs is about
A) 150 million kilometers. B) 10,000 seconds. C) 10 parallax seconds of angle. D) 32.6 light-years.
Which approach is currently proving to be the most promising way of determining how life on Earth originated?
A) studies of Martian meteorites B) studies of organisms living around deep-sea ocean vents C) studies of the fossil record D) laboratory simulations of conditions present on the early Earth
A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
A. 17 ?T B. 14 ?T C. 11 ?T D. 20 ?T E. 36 ?T