Which of the following systems cannot be analyzed as a visual binary?
A) Binary stars that are separately visible in a telescope
B) Binary stars that are about 2 AU apart
C) Binary star systems having orbital periods of hundreds or thousands of years
D) Binary stars orbiting so close to each other that they are not visible as separate stars
D
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This diagram shows how light from a binary star system would travel to Earth if the speed of light were not constant. What is its observational significance?
A) It tells us that if the speed of light were not the same for everyone, then we would not necessarily see binary stars as distinct objects. B) It shows that time runs slower for fast-moving objects. C) It shows that motion is relative. D) It shows that observers in different reference frames will not necessarily agree when two events are simultaneous.
Which of the following elements would be expected to be most stable?
A) Platinum-195 B) Iron-56 C) Carbon-12 D) Bismuth-209 E) Helium-3
A pair of 1-ohm resistors connected in parallel has a combined resistance of
A) 1 ohm. B) 2 ohms. C) 1/2 ohm. D) none of the above
When Jeff ran up a hill at 7.0 m/s, the horizontal component of his velocity vector was 5.1 m/s. What was the vertical component of Jeff's velocity?
A) 4.8 m/s B) 4.3 m/s C) 3.8 m/s D) 3.4 m/s