____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium
Fill in the blank(s) with correct word
Rich
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The radiation era lasted for only the first few billion years of the Big Bang
Indicate whether the statement is true or false
A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is 12 times that of the neutron.) What fraction of the neutron's kinetic energy is transferred to the carbon atom?
a. 14.4% b. 28.4% c. 41.4% d. 56.6%
Phase Angles: The phase angle of an RLC series ac circuit with an inductive reactance of 200 ? and a capacitive reactance of 100 ? is 40.0°. What is the resistance of the resistor in this circuit?
A. 100 ? B. 119 ? C. 156 ? D. 200 ? E. 265 ?
What do we mean when we say that the Sun is in gravitational equilibrium?
A) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity. B) The Sun maintains a steady temperature. C) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward. D) The Sun always has the same amount of mass, creating the same gravitational force.