Suppose the date is March 21 and the Sun crosses your meridian at an altitude of 23-1/2° in the north. Where are you?
A) the equator
B) the Tropic of Cancer (latitude 23-1/2°N)
C) the Tropic of Capricorn (latitude 23-1/2°S)
D) the Arctic Circle (latitude 66-1/2°N)
E) the Antarctic Circle (latitude 66-1/2°S)
E) the Antarctic Circle (latitude 66-1/2°S)
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Which telescope imaged the center of the Milky Way Galaxy at a wavelength of 8 microns to reveal the distribution of the dusty interstellar medium?
a. Spitzer Space Telescope b. infrared telescope c. European Southern Observatory d. X-ray telescope e. radio telescope
Kirchhoff's Rules: Determine the current in the 12-? resistor for the circuit shown in the figure assuming that the batteries are ideal.
A. 0.25 A B. 0.50 A C. 0.75 A D. 1.0 A
Which of the following best describes what we mean by gravitational lensing?
A) A massive object bends light beams that are passing nearby. B) A massive object scatters away the light of more distant objects. C) Gravity causes matter that would otherwise be dark to become visible. D) Telescope lenses are distorted by gravity.
What is the Q-value of the following reaction?
14N + 4He = 1p + 17O (14.003074 ) (4.002603 ) (1.007825 ) (16.999131 ) A) 11.91 MeV B) 1.191 MeV C) -1.191 MeV D) 1.279 × 10-3 MeV E) -1.279 × 10-3 MeV