We have three beakers A, B and C containing glycerin, water and kerosene respectively. They are stirred vigorously and placed on a table. The liquid which comes to rest at the earliest is
Correct answer: A. Glycerin
- A. Glycerin
- B. Water
- C. Kerosene
- D. All of them at the same time
Explanation
Glycerin has the highest viscosity among the three, so it dissipates flow energy fastest and returns to rest quickest. Thus, glycerin is the correct option.
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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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