Consider an X-ray binary system in which a compact object, surrounded by an accretion disk, is in a binary orbit with another star. All of the following statements about such accretion disks are true except:
A) The radiation from an accretion disk may vary rapidly in time.
B) The compact object may be either a neutron star or a black hole.
C) X-rays are emitted by the hot gas in the accretion disk.
D) Several examples of flattened accretion disks being "fed" by a large companion star can be seen clearly in photos from the Hubble Space Telescope.
E) The accretion disk consists of material that spills off the companion star.
D
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A 10-kg block is pushed across a horizontal surface with a horizontal force of 30 N against a friction force of 10 N. The acceleration of the block is
A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. E) none of the above
In deriving the axial electric field for the ring-shaped charge distribution and the electric field from a long line of charge, the component perpendicular to the resulting field is zero because of what physical property?
A) only net charge is important B) positive and negative charges cancel C) superposition D) integration E) symmetry
If grand unified theories are correct, what caused inflation at the end of the GUT era?
A) Gravity was an extremely weak force at this period in time. B) Large amounts of matter and antimatter annihilated at this time. C) There wasn't enough matter present to slow down the expansion at that time. D) The universe was too small and needed to grow quickly. E) An enormous amount of energy was released when the strong force froze out (became distinct) from the GUT force.
The ________ is the spherical outgassing as a comet nucleus is heated by the Sun
Fill in the blank(s) with correct word