A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?
A. 40 solar masses
B. 0.4 solar masses
C. 8 solar masses
D. 4 solar masses
E. 200 solar masses
Answer: C
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Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2
A particle of charge +2q is placed at the origin and particle of charge -q is placed on the x-axis at x = 2a. Where on the x-axis can a third positive charge be placed so that the net electric force exerted on it is zero?
A) 3.4a B) 6.8a C) 8.6a D) 9.3a E) 1.0a
How big is the universe? You calculated the radius of the Hubble Volume (the observable universe) in Procedure 3 . Is it possible to calculate the radius of the entire (everything that is) universe? Justify your answer. (Hint: Consider the expansion rate.)
Stepping barefoot off a rug onto a hardwood floor makes your feet feel cold. Why?
a. The hardwood floor is at a lower temperature than the rug. b. The hardwood floor is at a lower temperature than your feet. c. The hardwood floor conducts heat away from your feet better than the rug. d. all of the above