Carnot Engine: A heat engine having the maximum possible efficiency has an efficiency of 25% when operating between two heat reservoirs. If the temperature of the cold reservoir is 300 K, what is the temperature of the hot reservoir?
A. 350 K
B. 375 K
C. 400 K
D. 450 K
E. 500 K
Answer: C
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The flatness problem is the fact that the observed density of matter is unexpectedly different from the critical density predicted by the inflationary epoch
Indicate whether the statement is true or false
The length of a telescope is 2.00 m and the focal length of the objective is 2.0 cm. What is the focal length of the eyepiece?
A) 200 cm B) 202 cm C) 101 cm D) 2.0 cm E) 198 cm
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?
A) positive B) negative C) The particle could be either positive or negative. D) None of the above choices is correct.
V-shaped valleys are
A) "old-age" valleys. B) formed by glaciers. C) of depositional origin. D) common in mountainous regions.