If the universe is closed and finite, then
a. the universe has a center and an edge.
b. the universe will expand forever.
c. the final fate of the universe will be very cold and of extremely low density .
d. the space-time of the universe is negatively curved.
e. none of the above
E
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A small golden statue falls from a height of 8.2 m above the top surface of a pillow. If the acceleration of the statue upon striking the pillow is constant, what is the value of the acceleration if the pillow compresses by 3.9 cm as the statue comes to rest?
A. 2100 
B. 21
C. 160
D. 210
An object 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has a magnitude of 52 cm. (a) How far is the image from the vertex of the mirror? (b) What is the height of the image?
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Why were the mass and density of Pluto unknown until Charon was found?
What will be an ideal response?
When the principal quantum number is n = 5, how many different values of ? are possible?
1.1 2.5 3.9 4.25