The positively charged particle inside an atom is the nucleus
Indicate whether the statement is true or false
F
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The unified model describes active galactic nuclei using
a. a super massive black hole at the center of a normal spiral galaxy. b. a super massive black hole surrounded by an accretion disk and dense disk of gas. c. an accretion disk around a neutron star. d. gravitational lenses to intensify the radiation coming from them. e. different lines of sight toward and dwarf irregular galaxy.
Consider some water at 6°C. For a slight increase its temperature the water will
A) expand. B) contract. C) remain the same.
Why is it so difficult to remove the lid from a vacuum-sealed jar?
A) The air pressure outside the jar pushes downward on the lid more strongly than the air pressure inside pushes upward on the lid. B) The higher pressure inside the jar pulls inward on the lid, holding it firmly to the jar. C) The vacuum inside the jar pulls inward on the lid, holding it firmly to the jar. D) The vacuum inside the jar pushes outward on the lid, holding it firmly to the jar. E) The air pressure inside the jar pushes upward on the lid more strongly than the air pressure outside pushes downward on the lid.
What provides the energy (and so light and heat) of a star?
A. Continual explosions B. Atomic energy/nuclear reactions C. Lots of electricity D. Chemical reactions at the surface E. Gravitational contraction