Dark nebulae are opaque to all wavelengths of electromagnetic radiation
Indicate whether the statement is true or false
FALSE
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You drop a stone down a well that is 9.5 m deep. How long is it before you hear the splash? The speed of sound in air is 343 m/s and air resistance is negligible
A) 1.2 s B) 1.4 s C) 1.3 s D) 1.6 s E) 1.5 s
Two large non-conducting plates of surface area A = 0.25 m2 carry equal but opposite charges Q = 75 ?C. What is the energy density of the electric field between the two plates?
A) 1.7 × 107 J/m3 B) 5.1 × 1015 J/m3 C) 3.4 × 107 J/m3 D) 0 E) 2.5 × 1015 J/m3
In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:
A) top left. B) top right. C) middle of the main sequence. D) top center. E) bottom left.
The Martian polar caps are composed of frozen
A. water and carbon dioxide. B. water and sulfuric acid. C. water and methane. D. methane and carbon dioxide.