In a fluid at rest, pressure is exerted on any surface in contact with the fluid (like the walls of the cup) and acts perpendicular to the surface. Pressure also exists throughout the fluid's volume. However, pressure in a fluid at rest varies with depth due to the weight of the fluid above, according to the formula P = P₀ + ρgh, where P₀ is the surface pressure, ρ is the fluid density, g is gravity, and h is depth. Thus, pressure is not the same at all points unless they are at the same depth.
Which of the following statements about a fluid at rest in a cup is/are correct ? 1. Pressure is same at all the points in the fluid. 2. Pressure is exerted on the walls. 3. Pressure exists everywhere in the fluid. Select the correct answer using the code given below :
Asked in UPSC NDA 1 2018 · Topic: Mechanics (Fluid Statics and Dynamics (Continuity Equation, Bernoulli's Theorem))
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