Astronomers believe that the X-ray radiation from the nuclei of active galaxies comes from ________.
A. gravity waves
B. a black hole
C. magnetic fields
D. the accretion disk around a massive black hole
Answer: D
Physics & Space Science
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The energy stored in a stretched spring is an example of __________ energy
Fill in the blank(s) with correct word
Physics & Space Science
Which sector has consistently used the greatest percentage of energy in the United States?
Physics & Space Science
An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north?
A) 41 km/h B) 100 km/h C) 110 km/h D) 141 km/h
Physics & Space Science
Due to the unusual thermal expansion properties of water, when a lake freezes during the winter, the water at the bottom of the lake is at ________ temperature than the water above it
A) the same B) a higher C) a lower
Physics & Space Science