Advertisements
Advertisements
Question
A piece of wood if left under water comes to the surface. Explain the reason.
Advertisements
Solution
A piece of wood if left under water comes to the surface of water because the upthrust on body due to its submerged part is equal to its own weight.
APPEARS IN
RELATED QUESTIONS
When does an object float or sink when placed on the surface of a liquid ?
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
(a) body A having density of 500 kg m-3
For a floating body, how is its weight related to the buoyant force?
Why does a piece of ice float on water?
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just Below the free surface of water. State and explain your observation.
Two spheres A and B, each of volume 100 cm3 is placed on water (density = 1.0 g cm−3). The sphere A is made of wood of density 0.3 g cm−3 and sphere B is made of iron of density 8.9 g cm−3.
- Find:
- The weight of each sphere, and
- The upthrust on each sphere.
- Which sphere will float? Give reason.
A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer.
The blood pressure reading of a patient is recorded 160/100. Express the lower pressure in SI units.
[Take density of mercury as 13.6 × 103 kgm−3 and the value of ‘g’ as 10 ms−2]
Write the SI units of Buoyant force
