When a body is placed over a liquid, it will sink down ifa)Gravitation...
The object pushed downward, will stay at the same place till where it's pushed to(neither gets a downward/upward thrust due to gravity) and the pressure on top of the object and below it will also be the same.
More explaination:
The way that objects float is that at any depth in a fluid there is an upward force due to the effect of gravity on the fluid. This results in a pressure applied over an area.If the density of an object in the fluid is greater than the density of the fluid, the object will sink. If the density is less than that of the fluid, the object will float upward due to the buoyancy from the fluid.An object of lower density will float to the top and only be submerged by an amount according to the ratio of the densities.
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When a body is placed over a liquid, it will sink down ifa)Gravitation...
Explanation:
When a body is placed over a liquid, it will sink down if the gravitational force acting on the body is more than the up-thrust of the liquid. This can be explained by Archimedes' principle which states that when a body is fully or partially immersed in a fluid, it experiences an up-thrust which is equal to the weight of the fluid displaced by the body.
- Gravitational force: It is the force with which the earth attracts a body towards its center. The gravitational force acting on a body is directly proportional to the mass of the body and inversely proportional to the distance between the body and the center of the earth.
- Up-thrust: It is the force exerted by a fluid on a body immersed in it, in a direction opposite to the gravitational force. The magnitude of up-thrust depends on the density of the fluid, the volume of the fluid displaced by the body, and the acceleration due to gravity.
If the gravitational force acting on a body is more than the up-thrust of the liquid, then the body will sink down into the liquid. This is because the net force acting on the body is downwards and greater than the up-thrust, which is upwards. As a result, the body experiences a downward acceleration and sinks into the liquid.
If the gravitational force acting on a body is less than the up-thrust of the liquid, then the body will float on the surface of the liquid. This is because the net force acting on the body is upwards and greater than the gravitational force, which is downwards. As a result, the body experiences an upward acceleration and floats on the surface of the liquid.
If the gravitational force acting on a body is equal to the up-thrust of the liquid, then the body will remain suspended in the liquid without sinking or floating. This is because the net force acting on the body is zero and there is no acceleration.
Therefore, option C is the correct answer which states that a body will sink down if the gravitational force is more than the up-thrust of the liquid.
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