Advertisements
Advertisements
प्रश्न
When does an object float or sink when placed on the surface of a liquid ?
उत्तर
When an object is placed on the surface of water, two forces act on the object:
(i) The gravitational force that act in the downward direction.
(ii) The upthrust or the buoyant force that act in the upward direction.
An object floats on the surface of water if the upthrust of water on the object is greater than the weight of the object. An object sinks if the weight of the object is greater than the upthrust of water on the object.
APPEARS IN
संबंधित प्रश्न
In which direction does the buoyant force on an object due to a liquid act ?
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
body C having density 1100 kg m-3
What is the law of floatation?
What is meant by pressure? State its S.I. unit.
Complete the following sentence :
Pressure at a depth h in a liquid of density p is ......................
Complete the following sentence :
Pressure is .................... in all directions about a point in a liquid.
(i) The diameter of neck and bottom of a bottle are 2 cm and 10 cm, respectively. The bottle is completely filled with oil. If the cork in the neck is pressed in with a force of 1.2 kgf, what force is exerted on the bottom of the bottle?
(ii) Name the law/principle you have used to find the force in part (a).
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
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.
Higher Order Thinking Skill.
How does a fish manage to rise up and move down in water?
