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What will be centre of gravity of sphere full of water and it is leaking?
Wiki User
∙ 13y ago
If the sphere of water remains a sphere as it leaks, and the water leaving the boundary of the sphere are no longer considered part of the sphere, the center of gravity will be the center of sphere.
If the sphere does not have to remain a sphere as it leaks, if it was in a spherical container, the center of gravity would move downward from center, approaching the source of leakage.
Wiki User
∙ 13y ago
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Why the center of pressure of a submerged body lies below the center of gravity?
The upward thrust which the surrounding fluid exerts on an object is referred to as the force of buoyancy. This thrust acts through the centroid of the displaced volume, referred to as the centre of buoyancy. The centre of buoyancy is not the same as the centre of gravity which relates to the distribution of weight within the object. If the object is a solid with a uniform density exactly the same as water and the body is immersed in water the force of buoyancy will be exactly equal to the weight and the centre of buoyancy will be the same as the centre of gravity. The object will be in equilibrium with the surrounding fluid.
How to calculate centre of buoyancy with diameter 10m .height 100 m and thickness 2inch with density 7850kg per meter cube?
The centre of buoyancy (COB) of an object is the centre of gravity (COG) of the water that is displaced when the object is submerged. So to calculate the COB of an object you first need to calculate the COG of the object and the mass of the object in order to find out how the object will sit in the water and the shape of the water it displaces. Once the shape of the displced water is known, then the COG of the displaced water is then the COB of the object. Easy no? The centre of buoyancy (COB) of an object is the centre of gravity (COG) of the water that is displaced when the object is submerged. So to calculate the COB of an object you first need to calculate the COG of the object and the mass of the object in order to find out how the object will sit in the water and the shape of the water it displaces. Once the shape of the displaced water is known, then the COG of the displaced water is then the COB of the object. Easy no?
Do objects fall at the same speed through water?
No. The speed an object will fall in water depends on: 1) The mass of the object compared to the volume of water displaced 2) The hydrodynamic friction between the water and the objects motion 3) The local gravity. For example: A 10cm sphere of iron has a density of 7.8 and a mass of 4.08kg. The mass of water displaced is 0.52kg. Gravity exerts a downward force of 40.0N downwards on the sphere, while the water exerts an upwards force of 5.1N due to bouyancy. This means that there is an initial downward force of 34.9N downwards on the iron sphere. A 10cm sphere of glass has a density of 2.5 and a mass of 1.31kg. Gravity exerts a downward force of 12.8N downwards on the sphere, while the water exerts the same 5.1N upward bouyancy force. This means that there is an initial downward force of 7.7N downwards on the glass sphere. Both spheres will accelerate in water according to F=ma, where (F) is the force exerted, (m) is the mass and (a) is the acceleration. For the iron sphere, the initial acceleration is 8.6m/s2 while for the glass sphere the initial acceleration is 5.9m/s2. This difference is due to the bouyancy force of the water which is the same for both spheres, even though the masses are different. As the spheres accelerate, the drag force of the water will increase from zero to some value which equals the net gravity force calculated above. The drag coefficient will vary somewhat with the speed but it can be considered the same for both spheres if they are both the same smoothness. Since the forces are different, the steady state speed (terminal velocity) will be different for each sphere. A 10cm sphere of balsa wood has a density of 0.1 and a mass of 0.05kg. Gravity exerts a force of 0.5N downwards while the water exerts the same bouyancy force of 5.1N upwards. Thus the balsa sphere accelerates upwards rather than downwards because the water it displaces is heavier than it and squashes it up. It will have a terminal velocity in the upwards direction. By contrast, in a vacuum, there is no bouyancy force as nothing is being displaced so (F) is proportional to (m) and thus (a) is constant. In this case all the spheres would accelerate at the same speed. In our atmosphere, the bouyancy force of air is very small, so objects may appear to fall at the same rate when in fact they are very slightly different. A hydrogen sphere would rise in air, just like a balsa sphere rises in water.
Does gravity hold water?
If pool/lake/ocean water floats up: then no, gravity does not hold water. If pool/lake/ocean water does not float up: then yes, gravity does hold water.
What causes a water drop to form a sphere as it falls?
surface tension , water molecules trying to stick together will form the easiest shape a sphere
How ocean water stays in your sphere globe?
Gravity holds it on.
What is the Effect of zero gravity on water?
Without any other influences (air current, pokey fingers) water forms a sphere in zero gravity. Most astronauts like to play with spheres of water (or juice or other liquids).
Why can liquids change their shape for example why can water flow?
Gravity causes water to flow downhill. A blob of water released inside a spacecraft under zero gravity, will form a floating sphere. On earth, If there are no sides to retain the water, the water spreads out and forms a puddle.
Why the center of pressure of a submerged body lies below the center of gravity?
The upward thrust which the surrounding fluid exerts on an object is referred to as the force of buoyancy. This thrust acts through the centroid of the displaced volume, referred to as the centre of buoyancy. The centre of buoyancy is not the same as the centre of gravity which relates to the distribution of weight within the object. If the object is a solid with a uniform density exactly the same as water and the body is immersed in water the force of buoyancy will be exactly equal to the weight and the centre of buoyancy will be the same as the centre of gravity. The object will be in equilibrium with the surrounding fluid.
Can earths gravity increase or decrease?
Yes, it is not a constant. The force of gravity is related to the distance from the centre of the earth so that the force of gravity will be slightly reduced at altitudes. Also, the earth is not a perfect sphere - it bulges at the equator and is flatter at the poles. So the force of gravity will be greater at the poles. The force of gravity is also affected by what is under the surface: if standing over dense rocks, the force will be greater. Finally, the force of gravity is also higher after heavy rainfall. [I guess that is because the water fills up all the air gaps in the soil and so increases its density.]
Can earths gravity increase or decrease explain?
Yes, it is not a constant. The force of gravity is related to the distance from the centre of the earth so that the force of gravity will be slightly reduced at altitudes. Also, the earth is not a perfect sphere - it bulges at the equator and is flatter at the poles. So the force of gravity will be greater at the poles. The force of gravity is also affected by what is under the surface: if standing over dense rocks, the force will be greater. Finally, the force of gravity is also higher after heavy rainfall. [I guess that is because the water fills up all the air gaps in the soil and so increases its density.]
Why does water flow downward?
Gravity Gravity is the force that pulls everything downwards towards the centre of the earth. There are no scientific explanations to why and how this force works - it's God's perfect design.
When was Water Sphere created?
Water Sphere was created in 2005.
The water sphere of earth is known as what?
The water sphere of earth is the HYDROSPHERE.
Leaking coolant from water outlet?
Your engine may have a leaking hose connection or a leaking gasket at the water outlet. It could also be a leaking hose.
What is metasentric height?
A centre of buoyancy is the centre of gravity of the water displaced by the hull at a given angle of heel. For small angles of heel, up to about 15o, the vertical lines through the centres of buoyancy intersect through a point known as the metacentre. The distance between the boat's centre of gravity and its metacentre is its metacentric height. For more on this topic you might consider the wikipedia article.
The upward force of displaced fluid causing flotation?
Liquids, primarily water on the earth, and gasses, air, tend to form spheres in the absence of altering forces. The sphere is created by gravity naturally, where the forces acting around the center of gravity on the surface of the sphere are in equilibrium anywhere on the surface of the sphere. By introducing a solid mass on the surface of the sphere, which is less dense than the material of the sphere, it displaces that material creating a new surface further from the center of gravity of the sphere. The gravity acting on this new layer wants to pull the fluid back to it's original spherical shape by attempting to displace the solid object. Thus this downward force created is countered by an upward force of the fluid on the solid object it is trying to displace. **If the object were more dense than the fluid it would be drawn to the center of gravity, sink, thus the new surface of the fluid would again be in equilibrium.
