According to the text, humans have a _____ size compared to stellar and microscopic objects
a. extra small b. small
c. medium d. large
c
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What are the dark blobs (indicated by the red arrows) in this photograph from the Hubble Space Telescope?
A) cold, dense molecular clouds in which stars are forming B) warm atomic hydrogen gas, much like most of the gas in the galaxy C) tall interstellar bubbles blown out by supernovae or stellar winds D) jets of hot gas shot out from young binary star systems
Mass is a vector quantity
Indicate whether the statement is true or false
A 200-? resistor, a 25-mH inductor, and a capacitor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 240 ?, what is the value of the capacitor?
A) 5.5 ?F B) 3.2 ?F C) 4.2 ?F D) 6.5 ?F E) 7.5 ?F
Nearsighted people wear glasses with
lenses that are designed to a) make the image larger. b) improve the focus of the image. c) make the image smaller. d) make the image brighter.