In which wavelength region(s) would we need to carry out observations in order to study the accretion disk around a white dwarf in a binary system?
A) visible light
B) ultraviolet light
C) X-ray light
D) A and B
E) B and C
E
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A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.
What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A) The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole. B) We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole. C) Huge amounts of X-rays are pouring out of the center of the galaxy. D) The orbits of stars in the center of the galaxy indicate that the presence of 3 to 4 million solar mass object in a region no larger than our Solar System.
A reasonable estimate for the mass of a typical new-born baby is
A) 1 kg. B) 3 kg. C) 10 kg. D) 20 kg.
Which of the following best characterizes electrical conductors?
a. high tensile strength c. electric charges move freely b. poor heat conductors d. low mass density