The ebb and flow of the tides----- explained by Newton.
Correct answer: D. is
- A. are
- B. was
- C. were
- D. is
Explanation
The correct answer is option D) is because it aligns with the singular subject "The ebb and flow of the tides." In English grammar, it is crucial to match the verb form with the subject in number (singular or plural). The other options are incorrect: are (plural) and were (past tense plural) do not match the singular subject, while was (past tense singular) does not convey the ongoing nature of this general truth.
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About Fluid Dynamics
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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