Suppose a planet with mass M has a moon with mass M. Where is the system’s center of mass? Refer to the diagram below. 
A. A
B. B
C. C
D. D
E. E
B. B
Physics & Space Science
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The two headlights of a car are wired:
1.in series with each other. 2.in parallel. 3.neither in series or in parallel. 4.It is impossible to tell.
Physics & Space Science
Chromatic aberration occurs in a ____ telescope when ____
a. reflecting; different colors of light do not focus at the same point. b. refracting; different colors of light do not focus at the same point. c. reflecting; light of different wavelengths get absorbed by the mirror. d. refracting; light of different wavelengths get absorbed by the lens.
Physics & Space Science
How much work do you do when you lift a 3 N apple by 2 m during a time of 6 s?
A) 6 J B) 1 J C) 1.5 J D) 12 J E) 18 J
Physics & Space Science
How do astronomers know that the Crab Nebula is the remains of a supernova?
What will be an ideal response?
Physics & Space Science