Pressure of a gas is directly proportional to:
Correct answer: C. Average translational K.E. of its molecules
- A. Average K.E. of its molecules
- B. Average vibrational K.E. of its molecules
- C. Average translational K.E. of its molecules
- D. All of the above
Explanation
According to the kinetic theory of gases, gas pressure arises from collisions of molecules with the walls, which depend on their translational motion. Hence, the pressure of a gas is directly proportional to the average translational kinetic energy of its molecules.
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Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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