The observed evidence we have for black holes includes
A) X-rays that are thought to come from the center of a black hole.
B) visible light that is thought to come from the center of a black hole.
C) temperature measurement of certain extremely cold stars that are thought to be black holes.
D) X-rays that are thought to come from gases that are outside of a black hole.
E) observations of certain regions of space, larger than the largest known stars, that emit no light.
D
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Which of the following fibers has the highest specific tensile strength?
(a) Kevlar (b) OUHMWPE (c) SiC (d) Boron
The colorful effects that we see when viewing a compact disc (CD) are due to
A. The different colors embedded in the CD B. The absorption of certain colors C. The close spacing of the tracks which act as a diffraction grating
The impulse-momentum relationship is a direct result of
A) Newton's first law. B) Newton's second law. C) Newton's third law.
A mineral that looks glassy is said to have a(n) ______________ luster
Fill in the blank(s) with correct word