The darkness of the night sky in an infinite universe is addressed in
A) Steady State Physics.
B) the Cosmological principle.
C) General Relativity.
D) Special Relativity.
E) Olbers's paradox.
E
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There is very little interstellar gas or dust in most elliptical galaxies
Indicate whether the statement is true or false
When waves from a pair of closely-spaced slits arrive out of phase
A) a bright fringe is produced. B) a dark fringe is produced. C) both bright and dark fringes are produced. D) none of the above
One of the most efficient engines built so far has the following characteristics: The combustion chamber temperature is 1900°C,
the exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour. (1 cal = 4.186 J) (a) What is the actual efficiency of this engine? (b) What is the power output of this engine? (c) What would be the maximum possible efficiency for an engine using the same temperature extremes?
A long steel beam has a length of fifty meters on a cold day when the temperature is 0°C. What is the length of the beam on a hot day when T = 40°C? (asteel= 1.1 × 10^-5/°C)
a. 50.044 m c. 50.088 m b. 50.022 m d. 50.0044 m