Advertisements
Advertisements
प्रश्न
What is the law of floatation?
Advertisements
उत्तर
A body will float in a liquid if the weight of the body is equal to the weight of the liquid displaced by it.
Key Points:
-
Buoyant Force:
- When a body is partially or fully submerged in a liquid, it experiences an upward force called the buoyant force.
-
Condition for Floating:
- For a body to float, the buoyant force must equal the weight of the body.
- This happens when the density of the body is less than or equal to the density of the liquid.
-
Stable Floating:
- In equilibrium, the body displaces an amount of liquid whose weight is exactly equal to its own weight.
APPEARS IN
संबंधित प्रश्न
What causes buoyant force (or upthrust) on a boat ?
A body sinks in a liquid A but floats in a liquid B. The density of liquid A is ....... than the density of liquid B.
Describe an experiment to determine the density of the material of a coin.
Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions.
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
A body experiences an upthrust F1 in river water and F2 in sea water when dipped up to the same level. Which is more, F1 or F2? Give reason.
A metal solid cylinder tied to a thread is hanging from the hook of a spring balance. The cylinder is gradually immersed into the water contained in a jar. What changes do you expect in the readings of the spring balance? Explain your answer.
Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm−3 and g = 9.8 ms−2.
A body will sink if the weight of the body is greater than the buoyant force.
What do you understand by the term “Buoyancy”.
