Long period comets are thought to reside mainly in the:
A) asteroid belt.
B) Kirkwood gaps.
C) Kuiper Belt.
D) Oort Cloud.
E) Interstellar Medium.
D
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Ordinary matter makes up approximately ____percent of the critical density of the Universe
a. 0.1 b. 1 c. 4.5 d. 10 e. 50
A drive shaft resists torsional shear stress of 45 MPa and axial compressive stress of 100 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.15
(B) 0.55
(C) 1.2
(D) 1.9
When we look at an object that is 1,000 light-years away we see it
A) as it was 1,000 years ago. B) as it was 1,000 light-years ago. C) as it is right now, but it appears 1,000 times dimmer. D) looking just the same as our ancestors would have seen it 1,000 years ago.
Mineral sample #5 is ________.
Fluorite - CaF2 Muscovite - KAl2(AlSi3O10)(F,OH)2 Gypsum - CaSO4ยท2H2O