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Buoyancy Video Lecture | Crash Course: Class 9 (Hinglish)
FAQs on Buoyancy Video Lecture - Crash Course: Class 9 (Hinglish)
| 1. What is buoyancy? |  |
Ans. Buoyancy is the upward force exerted on an object immersed in a fluid (liquid or gas) due to the difference in pressure between the top and bottom of the object. It is the reason why objects float in water.
| 2. How is buoyancy calculated? | |
Ans. Buoyancy can be calculated using Archimedes' principle, which states that the buoyant force on an object is equal to the weight of the fluid displaced by the object. The formula to calculate buoyancy is:
Buoyant force = Density of fluid × Volume of fluid displaced × Acceleration due to gravity
| 3. What factors affect buoyancy? | |
Ans. Several factors affect buoyancy, including the density of the fluid and the volume of the object. If the density of the object is less than the density of the fluid, it will float. Additionally, the shape and size of the object also influence buoyancy. Objects with larger volumes displace more fluid and experience greater buoyant forces.
| 4. Why do ships float even though they are heavy? | |
Ans. Ships float because of the principle of buoyancy. The shape of a ship is designed in such a way that it displaces a large volume of water, which creates an upward buoyant force that counteracts the weight of the ship. As long as the buoyant force is greater than the weight of the ship, it will float.
| 5. How does a submarine sink and rise in water? | |
Ans. Submarines can sink and rise in water by controlling their buoyancy. When a submarine wants to sink, it fills its ballast tanks with water, which increases its weight and makes it denser than the surrounding water. This causes the submarine to sink. To rise, the submarine releases the water from its ballast tanks, decreasing its weight and making it less dense than the water, allowing it to float back to the surface.
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Video Description: Buoyancy for Class 9 2025 is part of Crash Course: Class 9 (Hinglish) preparation.
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