An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K.
b. 0°C.
c. 0°F.
d. 0°R.
e. the same as the temperature of the heat source.
A
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_____ say that certain things cannot be created out of nothing or vanish into nothing
A) Conservation laws B) Laws of kinematics C) Laws of planetary motion D) Illuminance laws
Most of the mass of the Milky Way is located in the halo of the galaxy in the form of dark matter
Indicate whether the statement is true or false
In a pure resistive circuit, the phase angle between current and voltage is
A) 0. B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians.
What is stream channel geometry?
A) The change in elevation of a stream. B) The shape of a stream channel as seen on a map. C) The amount of turbulence and laminar flow in a stream. D) The cross-sectional area and cross-sectional shape of a stream channel.