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I found an answer from www.quora.com

Why is lifting things so much easier when submerged in water ...

Because when you push the submerged object upwards, the surrounding water falls downwards. Suppose a boy wants to lift his sister. He tries simply picking ...

For more information, see Why is lifting things so much easier when submerged in water ...

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I found an answer from en.wikipedia.org

Buoyancy - Wikipedia

Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an ... Thus, among completely submerged objects with equal masses, objects with greater volume have greater buoyancy. This is also ... It is generally easier to lift an object up through the water than it is to pull it out of the water. Assuming ...

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Buoyancy | HowStuffWorks

Buoyancy - Buoyancy, the upward force needed from water to stay afloat, is the main reason why life jackets work ... As an object is submerged in water, it moves , or displaces, water according to how much it weighs ... Objects that displace an amount of liquid equal to their weight will float ... A life jacket provides this extra lift.

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I found an answer from www.britannica.com

Archimedes' principle | Description & Facts | Britannica.com

Here a 5-kg object immersed in ... The weight of the displaced portion of the fluid is equivalent to the magnitude of ... As the ship is loaded, it sinks deeper, displacing more water, and so the ... vessel to the brim with water, put the silver in , and found how much water the .... Easy unsubscribe links are provided in every email.

For more information, see Archimedes' principle | Description & Facts | Britannica.com

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I found an answer from www.britannica.com

Archimedes' principle | Description & Facts | Britannica.com

Here a 5-kg object immersed in ... The weight of the displaced portion of the fluid is equivalent to the magnitude of ... As the ship is loaded, it sinks deeper, displacing more water, and so the ... vessel to the brim with water, put the silver in , and found how much water the .... Easy unsubscribe links are provided in every email.

For more information, see Archimedes' principle | Description & Facts | Britannica.com

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I found an answer from www.bbc.com

Forces - Revision 2 - KS3 Physics - BBC Bitesize

Forces are pushes or pulls. They can be balanced or unbalanced. If unbalanced they can change the shape of objects and change the way they are moving.

For more information, see Forces - Revision 2 - KS3 Physics - BBC Bitesize

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Refraction in water (video) | Khan Academy

Refraction in Water. ... When light exits the refractive material the interference no longer occurs so the ... So does different gases do also affect the speed of light? .... so waves with longer wavelength can penetrate substances better but since .... yes, they all do those things, but, such x-rays and gamma; they are very short ...