Red and orange stars are found evenly spread throughout the galactic disk, but blue stars are typically found
A) only in or near star-forming clouds.
B) in the halo.
C) only in the central bulge.
D) also evenly spread throughout the galactic disk.
A) only in or near star-forming clouds.
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What is the total mass of the Earth's atmosphere? The radius of the Earth is 6.4 × 106 m, and 1 atm = 1.01 × 105 N/m2.
A. 5.3 × 1016 kg B. 1.1 × 1018 kg C. 5.3 × 1018 kg D. 1.1 × 1020 kg E. 5.3 × 109 kg
Gauss's Law states that the net electric flux, 
, through any closed surface is proportional to the charge enclosed: 
. The analogous formula for magnetic fields is:
A.
.B.
.C.
.D.
.E.
.Because protostars are at a low temperature and surrounded by dust and gas, astronomers must observe them with ________.
A. ultraviolet telescopes B. gamma ray telescopes C. radar D. infrared and radio telescopes
A single conservative force Fx = (6.0x ? 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0 . What is the potential energy at x = 3.0 m?
a. +11 J b. +29 J c. +9.0 J d. ?9.0 J e. +20 J