Temperature measures
a. how much heat is in a substance
b. the internal energy of an object
c. the average speed of atoms and molecules in a substance
d. the average kinetic energy of atoms and molecules in a substance
D
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Despite varying masses, all spiral galaxies look essentially the same
Indicate whether the statement is true or false
How do we learn about what is going on in the center of our own galaxy (the Milky Way)?
A) We have learned it only recently, thanks to the great photographs obtained by the Hubble Space Telescope. B) We cannot see the galactic center with visible or ultraviolet light, but radio and X-rays from the center can be detected. C) The gas and dust in the Milky Way prevent any type of direct observation of the galactic center, but theoretical models allow us to predict what is happening there. D) We must look at the centers of other galaxies and hope that ours is just like others. E) We can study it with visible telescopes as with any other star in the Galaxy.
Contrast the deaths of low- versus high-mass stars
What will be an ideal response?
A stretched string is observed to vibrate in three equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string?
a. 480 Hz b. 320 Hz c. 160 Hz d. 640 Hz e. 240 Hz