Mechanics - Fluids - Buoyancy Online Practice Exams | ENGINEERING Exams

Mechanics - Fluids - Buoyancy

Free Mock Test

Questions 7
Maximum mark 12

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Mechanics - Fluids - Buoyancy Online Practice Exams FAQs

1. What is buoyancy in fluid mechanics, and how does it relate to Archimedes' principle?

Buoyancy is the upward force exerted on an object submerged in a fluid, counteracting the object's weight. It's governed by Archimedes' principle, which states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of the displaced fluid.

2. How do engineers calculate buoyant force and determine whether an object floats or sinks?

Engineers calculate buoyant force using Archimedes' principle:

Calculate the weight of the fluid displaced by the object.
Compare it to the weight of the object.
If displaced fluid weight > object weight, the object floats.
If displaced fluid weight = object weight, the object is neutrally buoyant.
If displaced fluid weight < object weight, the object sinks.

This calculation determines whether an object will float or sink in a fluid based on its density and the fluid's density.

3. What factors affect buoyancy and the buoyant force on an object in a fluid?

Factors affecting buoyancy and the buoyant force include:

Fluid density: Higher density fluids exert greater buoyant forces.
Object volume: Larger volume displaces more fluid, resulting in a greater buoyant force.
Gravitational acceleration: Higher gravity increases the buoyant force.
Object density: Objects denser than the fluid will sink.
Fluid pressure changes: Depth changes affect fluid density and buoyant force.

Engineers must consider these factors when designing objects to float, sink, or maintain neutral buoyancy in different fluid environments.

4. How do engineers apply buoyancy principles in designing ships and submarines?

Engineers apply buoyancy principles in ship and submarine design by:

Designing hull shapes that displace water to achieve buoyancy.
Calculating the optimal buoyant force for stable flotation.
Adjusting ballast and weight distribution for controlled sinking and rising.
Considering the effects of buoyancy on stability and maneuverability.
Using buoyancy to control depth and maintain balance in submarines.

Buoyancy is a fundamental consideration in naval architecture, ensuring the safe and effective operation of ships and submarines in various water conditions.

5. How does buoyancy play a role in engineering applications beyond aquatic vehicles?

Buoyancy plays a role in various engineering applications beyond aquatic vehicles:

Hot air balloons use buoyant force for controlled flight.
Subsea structures use buoyancy for installation and maintenance.
Bridges and offshore platforms consider buoyancy for stability.
Crane and heavy lifting operations account for buoyant forces.
Manufacturing processes involve buoyancy in fluid-based operations.

Buoyancy's principles have diverse applications across engineering disciplines, contributing to the design, operation, and safety of various systems and structures.

Mechanics - Fluids - Buoyancy Online Practice Exams