If the torque acting on an object about a certain axis is zero, what can we say about the angular momentum of this object with respect to this axis?
1.It is zero.
2.It is constant.
3.It can never be zero.
4.Nothing, angular momentum has nothing to do with torque.
2
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The youngest stars in the Orion Nebula and other star-forming regions also show
a. circumstellar disks. b. jets. c. circumstellar disks and jets.
Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes?
A) You will not be able to see these two stars at all. B) The two stars will look like a single point of light. C) The two stars will appear to be touching, looking rather like a small dumbbell. D) You will see two distinct stars. E) You will see only the larger of the two stars, not the smaller one.
The Sun's observed spectrum is
A) a continuum with no lines, as shown by the rainbow. B) only emission lines on a black background. C) only absorption lines on a black background. D) a continuum with absorption lines. E) a continuum with emission lines.
A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m
The car maintains its speed as it drives through the depression. What is the force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N