Which of the following statements best describes the two principle advantages of telescopes over eyes?
A) Telescopes can collect far more light with far greater magnification.
B) Telescopes have much more magnification and better angular resolution.
C) Telescopes collect more light and are unaffected by twinkling.
D) Telescopes can collect far more light with far better angular resolution.
D
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Which of these is NOT a common misconception?
a. A light year is a unit of time. b. Stars look like disks when seen through a telescope c. A galaxy is a star plus its planets. d. All of the other choices are misconceptions.
Conversion of Units: There are 640 acres in a square mile, 5280 ft in one mile, and 3.28 ft in one meter. How many acres are there in a hectare, which is a square one hundred meters on each side?
Fill in the blank(s) with the appropriate word(s).
A 120-V rms voltage is applied across a 6.0-?F capacitor. If the frequency of the generator is 60 Hz, what is the rms value of the current in the circuit?
A) 0.17 A B) 0.37 A C) 0.27 A D) 0.47 A E) 0.071 A
In interactions taking place by the strong force, which of the following quantities are conserved?
a. electric charge b. baryon number c. mass-energy d. strangeness e. linear momentum f. angular momentum (spin)