What are some of the things astronomers can learn about astronomical objects from their spectra?
A. chemical composition
B. how fast the objects are moving
C. whether a gas or solid or combination, due to the type of spectrum
D. All of these choices are correct.
Answer: D
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Gravitational Potential Energy: A projectile is shot straight up from the surface of Earth by means of a very powerful cannon and experiences no appreciable air resistance. If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon? (G = 6.67 × 10-11 N ? m2/kg2, the radius of Earth is 6.38 × 106 m, and Mearth = 5.97 ? 1024 kg)
A. 355 m/s B. 505 m/s C. 827 m/s D. 710 m/s E. 906 m/s
The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen
Fill in the blank(s) with correct word
A 4.0-kg aluminum block is originally at 10°C. If 160 kJ of heat is added to the block, what is its final temperature? The specific heat capacity of aluminum is 910 J/kg ? K
A) 24°C B) 34°C C) 44°C D) 54°C
The majority of planets are estimated to be gas giants
Indicate whether the statement is true or false