Advertisements
Advertisements
प्रश्न
A plastic cube is released into the water. Will it sink or come to the surface of the water?
Advertisements
उत्तर
When a plastic cube is released into water, it will come to the surface and float if its density is lower than the density of water. This happens because of buoyancy. Water exerts an upward buoyant force on the cube, and if this force is equal to or greater than the cube’s weight, the cube floats.
In this experiment, the plastic cube floats because it is less dense than water. In contrast, a glass cube usually sinks because its density is greater than that of water, so its weight is greater than the buoyant force acting on it.
संबंधित प्रश्न
Name the scientist who gave he magnitude of buoyant force acting on a solid object immersed in a liquid.
A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part.
What is the cause of buoyant force ?
The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will
How does the density of a body and that of a liquid determine whether the body will float or sink into that liquid?
How is the unit bar related to the S.I. unit pascal?
A hammer exerts a force of 1.5 N on each of the two nails A and B. The area of cross section of tip of nail A is 2 mm2 while that of nail B is 6 mm2. Calculate pressure on each nail in pascal.
Prove that the loss in weight of a body when immersed wholly or partially in a liquid is equal to the buoyant force (or upthrust) and this loss is because of the difference in pressure exerted by liquid on the upper and lower surfaces of the submerged part of body.
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.
Complete the analogy.
Downward force: Weight:: Upward force offered by liquid: _____
