题目内容

In an isobaric process, the _______ remains constant.

A. temperature
B. pressure
C. volume
D. entropy

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The conservation of energy principle states that during an interaction, energy can change from one form to another but the total amount of energy _______.

A. remain constant
B. increase
C. decrease
D. fluctuate

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A _______ consists of a fixed amount of mass, and no mass can cross its boundary.

A. closed system
B. open system
C. control volume
D. cycle

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The critical Reynolds number of a rough-walled pipe is about _______.

A. 3x106
B. system
C. 3x105
D. streamline
E. 2 000
F. pathline
G. particle
H. 1 500 7 A ___C____ is the locus of points traversed by a given particle as it travels in a field of flow; it provides us with a “ history ” of the particle’s locations.

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In the Eulerian description of motion the velocity vector, in general, depends on three space variables and time, that is, V=V(x, y, z, t). Such a flow is a _______.

A. three- dimensional flow
B. two-dimensional flow
C. one-dimensional flow
D. None of the above is true

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In an isobaric process, the _______ remains constant.

A. temperature B. pressure C. volume D. entropy

The conservation of energy principle states that during an interaction, energy can change from one form to another but the total amount of energy _______.

A _______ consists of a fixed amount of mass, and no mass can cross its boundary.

The critical Reynolds number of a rough-walled pipe is about _______.

In the Eulerian description of motion the velocity vector, in general, depends on three space variables and time, that is, V=V(x, y, z, t). Such a flow is a _______.

A. temperature
B. pressure
C. volume
D. entropy