Which of the following represent reasonable order-of-magnitude estimates for your age in seconds?
1. 109 s
2. 1011 s
3. 107 s
4. 105 s
1
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The mass of a supermassive black hole thought to power a typical bright active galactic nucleus is roughly
A) 3 solar masses. B) 10 solar masses. C) 1 trillion solar masses. D) 1 billion solar masses.
Two optically flat glass plates, 16.0 cm long, are in contact at one end and separated by 0.0200 mm at the other end
The space between the plates is occupied by oil with index of refraction 1.45. The index of refraction of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. If the dark fringes are spaced 2.00 mm apart, what is the wavelength of the monochromatic light? A) 525 nm B) 475 nm C) 675 nm D) 425 nm E) 725 nm
____________________ can be used to determine the distance to a star when the spectrum of the star can be used to determine its spectral type and luminosity class
Fill in the blank(s) with correct word
An aluminum beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 60 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 16 mm
(C) 22 mm
(D) 26 mm
