A black hole is _____
a. an object so dense that light cannot escape its surface
b. a neutron star that has exceeded the Chandrasekhar limit
c. a theoretical model that has never been observed
d. an observed object that is not well understood
e. the result of a neutron star merger
a
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Quasars are common in the early Universe because ____ at that time
a. galactic collisions were more frequent b. black hole collisions were more frequent c. gas and dust clouds were denser d. galaxies were more isolated e. central bulges were larger
The Herschels' grindstone model of the Milky Way star system was too small because
a. they did not count the brightest stars. b. they did not study the southern sky. c. they did not have large enough telescopes. d. they only observed stars in the disk of the galaxy and not the halo. e. they did not know about interstellar dust clouds.
The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field?
A) 6.7 pT B) 6.7 mT C) 6.7 nT D) 6.7 ?T E) 6.7 T
When a laboratory sample of unknown mass is placed on a vertical spring-scale having a spring constant of 467 N/m, the system obeys the equation y = (4.4 cm) cos(33.3 s-1 t). What is the mass of this laboratory sample?
What will be an ideal response?