When a star collapses to half size, the gravitational field at its surface
A) doubles.
B) quadruples.
C) increases eightfold.
D) remains constant.
Answer: B
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The Sun and stars rise in the east, and set in the west. Contrast ancient and modern explanations for this observation
What will be an ideal response?
An eclipse season is the period of time during which the
a. moon crosses a node in its orbit. b. sun crosses a node in the moon's orbit. c. line of nodes crosses the moon's orbit. d. the moon is new or full. e. the moon is visible during the day.
A red razorback uniform appears red because
A. It refracts red wavelengths B. It creates constructive interference for red wavelengths C. It reflects red wavelengths D. It absorbs red wavelengths
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
The diagram below shows 3 vectors which sum to zero, all of equal length. Which statement below is true?
?
?
A.
B.
C.
D.
E.
