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

Physics & Space Science

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There is very little interstellar gas or dust in most elliptical galaxies

Indicate whether the statement is true or false

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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?

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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

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