This figure shows observations that have allowed astronomers to determine the orbits of several stars around Sgr A* (the central object). What can we learn about Sgr A* by analyzing these orbits?
A) its mass
B) its age
C) its chemical composition
D) all of the above
A) its mass
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Describe the surface features of Venus. If the atmosphere is so thick and the planet is so hot, how do we know about these surface features on Venus?
What will be an ideal response?
Define the purpose of value-added content. What criteria can you use to determine whether or not to add a content element? List examples of types of value-added content you can add to a website.
What will be an ideal response?
As you are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction of the angular velocity of the door as you open it?
A) up B) down C) to your left D) to your right E) forwards
The power of a lens is 4.0 diopters and its diameter is 5.0 cm. What is the focal length of this lens?
A) 25 cm B) 55 cm C) 10 cm D) 0.25 cm E) 2.5 cm