Advertisements
Advertisements
प्रश्न
Why does a block of wood held under water rise to the surface when released ?
Advertisements
उत्तर
A wooden block held under water floats on the surface on release because it is less dense than water. A substance floats if it is less dense than the fluid in which it is immersed after the external force is withdrawn from it.
APPEARS IN
संबंधित प्रश्न
Define the term relative density of a substance.
What physical quantity is measured in bar?
- Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. Density of mercury is 13.6 g cm-3.
- Will the height of the water column in part (a) change if the cross-section of the water column is made wider?
What is meant by the term buoyancy?
Define upthrust and state its S.I. unit.
Complete the following sentence.
Mass = .................... × density
Two identical pieces, one of ice (density = 900kg per meter cube) and other wood (density = 300kg per meter cube) float on water.
- Which of the two will have more volume submerged inside water
- Which of two will experience more upthrust due to water.
Select the correct option:
The phenomenon due to which a solid experiences upward force when immersed in water is called:
Complete the analogy.
Downward force: Weight:: Upward force offered by liquid: _____
The point at which the force of buoyancy is supposed to act is known as ______.
