If Star A is closer to us than Star B, then Star A's parallax angle is
A) smaller than that of Star B.
B) larger than that of Star B.
C) hotter than that of Star B.
D) fewer parsecs than that of Star B.
B
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Intense and blinding light that reduces visibility
A. Circadian Rhythm
B. Glare
C. Vincent Van Gogh
D. International Dark-Sky Association
E. Shielding
F. Sky Glow
Uncertainty Principle Using Momentum and Position: A 10-g bouncy ball is confined in a 8.3-cm-long box. What is its minimum energy? (h = 6.626 × 10-34 J ? s)
A. 8.1 × 10-65 J B. 3.2 × 10-46 J C. 1.3 × 10-20 J D. 9.4 × 10-75 J
Protoplanets
a. grew in size primarily by accretion. b. grew in size primarily by condensation. c. are still visible today as the terrestrial planets. d. grew in size by collecting the particles in the solar wind. e. grew in size by the collision and coalescing of planetesimals.
An amount of heat is added to ice, raising its temperature from ?10°C to ?5°C. A larger amount of heat is added to the same mass of liquid water, raising its temperature from 15°C to 20°C. From these results, we conclude that:
A. overcoming the latent heat of fusion of ice requires an input of energy B. the latent heat of fusion of ice delivers some energy to the system C. the specific heat of ice is less than that of water D. the specific heat of ice is greater than that of water