Physics · Fluid Mechanics
Which of the following statements correctly identifies the forces acting on a fluid element at rest and explains their balance under fluid-static (hydrostatic) conditions?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Only pressure forces act, and inertial forces always balance them.
- 2Gravity acts as a body force, balanced by a gradient in pressure in the vertical direction.✓
- 3Viscous forces dominate and are balanced by buoyant forces.
- 4Surface tension acts in the bulk fluid and balances hydrostatic pressure.
Correct answer
Gravity acts as a body force, balanced by a gradient in pressure in the vertical direction.
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