What is the role of collisions between galaxies in the formation and evolution of galaxies?
A) in a collision both galaxies are always destroyed so galaxy formation must be an ongoing process
B) galaxies are moving very fast and when they collide they always just move right through each other, never to interact again
C) larger galaxies may have formed from the merger of smaller ones
D) galaxies are much too far apart to ever have collisions
E) in a collision all the stars in the galaxies are spread out and then must find other stars and come together and form new galaxies
Ans: C) larger galaxies may have formed from the merger of smaller ones
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a. are wider than the lines from stars because the gas is hotter than most stars. b. are more narrow than the lines from stars because the gas has a lower pressure than stars. c. indicate that the interstellar medium contains dust. d. indicate that the interstellar medium is expanding away from the sun. e. none of the above
Why do scientists use the scientific method?
What will be an ideal response?
During each cycle, the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of thermal energy from the interior of the refrigerator
How much thermal energy do the coils behind the refrigerator discharge into the kitchen each cycle? A) 110 J B) 150 J C) 330 J D) 480 J E) 630 J
A useful instrument that makes use of the wavelike properties of electrons is the electron ______________
Fill in the blank(s) with correct word