To observe a visual binary, we must measure radial velocities
Indicate whether the statement is true or false
F
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What is true about Antares?
A: name means "Rival of Mars" B: ˜700 times the size of the Sun C: possibly egg-shaped D: cooler than the Sun E: all of the above
Two people stand on different floors of an outdoor stairway. One is 6 m above the ground and the other is 12 m above the ground. The person on the lower floor throws a ball upward with a speed of 15 m/s and the other person just drops hers. Ignoring air resistance, which ball hits the ground at a higher speed?
A. The one thrown upward B. They both hit the ground with the same speed C. The one that is dropped
The Milky Way Galaxy contains about ________ stars. Most of these stars are probably ________.
A. 100 billion; red giants B. 10 billion; white dwarfs C. 100 billion; cool dwarfs D. 100 billion; O and B type stars
A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
a. 7.5 kg b. 5.0 kg c. 6.0 kg d. 4.2 kg e. 8.0 kg