What force(s) are responsible for the collapse of an interstellar cloud?

a. nuclear
b. gravity
c. electric
d. magnetic
e. electric and magnetic


b

Physics & Space Science

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One of the harmonics of a column of air open at both ends has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?

A) 32 Hz B) 64 Hz C) 88 Hz D) 128 Hz E) 256 Hz

Physics & Space Science

Herschel's original disk model placed us close to the center of the Galaxy

Indicate whether the statement is true or false

Physics & Space Science

What is the hardness of diamond on the Mohs scale?

a. 1 b. 4 c. 7 d. 10

Physics & Space Science

This photo shows a single star photographed by the Hubble Space Telescope. Why doesn't the star appear as a single, sharp point of light?

A) The wave properties of light make this type of blurring an unavoidable feature of any telescope. B) We are seeing a planetary system around the star. C) The image of the star is overexposed. D) The telescope was not properly focused when it took this photo.

Physics & Space Science