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Fluid Mechanics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsFluid Mechanics1 Mark
MCQ
Consider the equations $\text{P}=\lim_\limits{\triangle\text{s}\rightarrow0}\frac{\text{F}}{\triangle\text{s}}$ and $\text{P}_1-\text{P}_2-\text{pgz}$ In an elevator accelerating upward.
  • A
    Both the equations are valid.
  • ✓
    The first is valid but not the second.
  • C
    The second is valid but not the first.
  • D
    Both are invalid.
✓

Answer

Correct option: B.
The first is valid but not the second.
For a point inside the elevator, pressure can be defined as $\text{P}=\lim_\limits{\triangle\text{s}\rightarrow0}\frac{\text{F}}{\triangle\text{s}}\cdot$
It is independent of the acceleration of the elevator.
The modified form of the second equation, which will be valid in the given case, is given. $\text{P}_1-\text{P}_2=\text{p}(\text{g}+\text{a}_0)\text{z}$
Here, acceleration $a_0($say$)$ due to elevator accelerating upwards is also taken into account.

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