A star is in an elliptical orbit around a black hole (which can't be seen). You have been observing the motion of the star through a telescope and have followed the motion long enough to establish that it is elliptical
How can you determine on which focus of the ellipse the black hole is located?
The speed of the star would be fastest on the side of the ellipse nearest to the black hole, and slowest near the empty focus.
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Instructions: On occasion, the notation 
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The diagram below shows 3 vectors which sum to zero, all of equal length. Which statement below is true?
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A.
B.
C.
D.
E.
An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2 . What is the magnitude of the force the object exerts on the floor of the elevator?
a. 59 N b. 10 N c. 89 N d. 68 N e. 78 N
The Moon always keeps the same side facing Earth
a. True b. False Indicate whether the statement is true or false
What practical value did astronomy offer ancient civilizations?
What will be an ideal response?