Scientists who study the Universe as a whole are called _______________
Fill in the blank(s) with correct word
cosmologists
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What produces the 21-cm line that we use to map out the Milky Way Galaxy?
A) atomic hydrogen B) ionized hydrogen C) molecular hydrogen D) carbon monoxide E) helium
At absolute temperature T, a black body radiates its peak intensity at wavelength ?. At absolute temperature 2T, what would be the wavelength of the peak intensity?
A) ?/2 B) 2? C) ? D) 16? E) ?/16
Two thin cables, each having a diameter of d 5 t/6 and carrying tensile loads P, are bolted to the top of a rectangular steel block with cross-sectional dimensions b 3 t. The ratio of the maximum tensile to compressive stress in the block due to loads P is:
(A) 1.5
(B) 1.8
(C) 2.0
(D) 2.5
Which graph shows an object moving with a constant non-zero velocity?
GRAPH A
GRAPH B
GRAPH C
