Three engines operate between reservoirs separated in temperature by 300 K. The reservoir temperatures are as follows:
Engine A: Th 5 1 000 K, Tc 5 700 K
Engine B: Th 5 800 K, Tc 5 500 K
Engine C: Th 5 600 K, Tc 5 300 K
Rank the engines in order of their theoretically possible efficiency, from highest to lowest.
1.A, B, C
2.B, C, A
3.C, B, A
4.C, A, B
3
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The air temperature where the humidity reaches the saturation density is called the ___________
Fill in the blank(s) with correct word
In a city high in the mountains, such as Denver, CO, water boils
A) at the same temperature as it does at sea level. B) at a higher temperature than it does at sea level. C) at a lower temperature than it does at sea level. D) at a higher temperature than it does at sea level in the morning but at a lower temperature than it does at sea level the rest of the day. E) at a lower temperature than it does at sea level in the morning but at a higher temperature than it does at sea level the rest of the day.
The specific heat of soil (average value) is one-fourth of a calorie per gram degree Celsius. Explain why water is a better moderator of temperature than soil
A system consisting of a negatively-charged particle and an electric field
a. gains potential difference and kinetic energy when the charged particle moves in the direction of the field. b. loses electric potential energy when the charged particle moves in the direction of the field. c. gains kinetic energy when the charged particle moves in the direction of the field. d. gains electric potential energy when the charged particle moves in the direction of the field. e. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.