Does the gravity of the submarine change from a large river to the sea suspended in water ?

suspended in water, indicating that the gravitational force is equal to the buoyancy of the water.

If gravity does not change, buoyancy does not change. (Gravity can be approximated to be only related to mass, which is the amount of matter contained in an object, which can be regarded as constant in this question, so your question itself is wrong and the concept is not clear.) ）

Seawater is denser than river water, and from river to sea, the same volume of displacement will increase the buoyancy obtained (Archimedes' law: the buoyancy of an object is equal to the weight of the liquid discharged), that is, from the river to the sea, the submarine must enter the boat from the surrounding area to maintain balance and maintain a suspended state. Otherwise, the submarine will surface, reducing the displacement while maintaining the balance of gravity and buoyancy.

Therefore, from the river to the sea, the buoyancy of the suspended submarine will increase, the gravity of the submarine will not change, and the water will be introduced to maintain the suspension, so that the total weight of the water in the submarine and the suction boat will increase.

Learn physics, and be clear!

Won't change. The gravity of a submarine is only related to its own mass, not to the concentration of the water in which it is located. But the submarine goes from the river to the sea, and because the concentration of water increases, it will float even more.

In general, the gravity of a submarine remains the same, but its buoyancy increases (the density of seawater is greater than that of a river). If it must be said that its gravity changes, it depends on the geographical location of the great rivers and seas, because the higher the latitude, the greater the gravitational acceleration g, and the gravity may change when the mass of the submarine remains the same.

The mass does not change, and the gravity does not change. Suspension, the displacement volume remains the same, the water density increases, and the buoyancy increases, so the submarine is to reduce the compressed air discharged and suck in water. It stays suspended, so it has more mass and more gravity.

The answer is wrong, don't believe the answer, a bunch of guys who only know what they think are made up!!

The gravity does not change, and the buoyancy = liquid density * g * v row , will change. The density of the sea is greater than that of the river.

Mentally retarded problem! Because it asks whether the gravity of the "submarine" changes, and as long as the gravitational acceleration does not change significantly, the gravity of the same submarine does not change, of course!

Of course, gravitational acceleration varies from place to place. The gravitational acceleration at the poles and the equator is about the same. Aside from these nerdy factors, the gravity of the submarine remains the same no matter where it goes on Earth!!

Far from the center of the earth in the river and close to the center of the earth in the sea (generally the river flows into the sea, the river is higher than the sea above the sea level), strictly speaking, the submarine is subject to the gravitational pull of the earth, that is, gravity, and is smaller in the sea (things on the earth farther from the center of the earth than the submarine do not contribute to the gravitational pull).

The depth of the ocean is greater than the depth of the river, and the density of the sea is less than that of the rocks, so the gravitational force received in the sea is slightly smaller, and the gravity force is slightly smaller (only a theoretical result, completely unobservable)!

If only submarines are counted, there is no change.

But if you add the water inside the submarine, it will get bigger.

Boss. What is the formula for gravity?

f=gm.

How can it change?

The submarine did not change the relationship between buoyancy and gravity. According to Archimedes' principle, the buoyancy experienced by an object in a liquid is equal to the weight of the liquid it distributes, which determines the float and sink of the object in the liquid.

Submarines change their buoyancy by adjusting the tanks or spherical stings inside the submarine. When the submarine wishes to sink, the tank or spher is filled with water, which increases the mass of the submarine, so that the submarine is less buoyant and sinks. When the submersible boat wants to float, the water is pumped out of the tank or ball, which reduces the mass of the submersible boat, so that the buoyancy of the submarine increases, and thus floats.

Therefore, the submarine does not change the relationship between buoyancy and gravity, but the purpose of sinking and floating by controlling its own buoyancy.

The submarine relies on the water absorption and drainage of its own water tank to change its own gravity, and does not change the relationship between gravity and buoyancy, so that it is correct to achieve floating and sinking

So the answer is:

Please note that this is a "submersible" water boat.

So what doesn't change is the volume of drained waterHowever, the mass and gravity of the submarine itself changed

As a result, when a submarine travels from a river to the ocean, its buoyancy becomes greater and its own gravity increases. In this way, it can remain suspended.

Because the density of seawater is larger than that of rivers, the buoyancy provided by seawater to the submarine is greater.

a. The submarine relies on changing its own gravity to achieve floating or diving, so A is wrong;

b. When the submarine is in the suspension city, according to the suspension conditions, the buoyancy at this time is equal to its own gravity, so B is correct;

c. The original submarine is suspended, and the buoyancy is greater than the gravity, so that the submarine will sink with hail, the gravity should be greater than the floating pure sail force, and because the buoyancy of the submarine remains unchanged, the water tank should be filled with water to increase the gravity, so C is correct;

d. To make the submarine float, the gravity should be less than the buoyancy, because the buoyancy of the submarine is unchanged, a part of the water in the water tank should be discharged to reduce the gravity, so D is correct;

So choose A

Submarines float and sink by changing the force of gravity.

The ascent and sinking here refer to the change from a floating or suspended state to a floating state and a floating state to a suspended or sinking state.

Levitating at different depths, gravity equals buoyancy. The volume of the submarine has not changed, and the volume of the water discharged has not changed, so the welfare has not changed, and the gravity has not changed.

Levitation refers to when buoyancy is equal to gravity, upward floating refers to when buoyancy is greater than gravity, and sinking is when gravity is greater than buoyancy, which can be achieved by draining. You may not understand the meaning of this question, as if you say that the change in gravity does not include ascending and sinking.

The submarine dives at a constant speed in the seawater, indicating that it is balanced by force, and the force on the side of the heavy skin is equal to the buoyancy, and because its volume cannot be changed, the buoyancy it is subjected to will naturally not change, so the gravity will not change. To put it simply, burning oak is: the gravity of the dive does not change at a constant velocity.

The book says that the submarine rises and falls by changing its gravity, which is not contradictory to what you said. "Change your own gravity" is an action before "diving at a constant speed", and during "diving at a constant speed", the water injection is completed and the water is no longer filled.

Therefore, when diving at a constant speed, its mass does not change, its velocity does not change, so the kinetic energy does not change.

The volume of the submarine is constant, so the volume of the liquid discharged is the same, and the buoyancy is equal to the density of the liquid The volume of the liquid g, driven from the river to the sea, because the density of the sea water is greater than the density of the river, the buoyancy will increase.

A change in the buoyancy of a boat from the river to the sea means that the buoyancy experienced by the boat does not change.

It can be understood that when the river water with less self-density enters the denser seawater, because the ship's own gravity does not change, it will float in a state, that is, in a state where its own gravity is equal to the buoyancy it is subjected to, the buoyancy must not change.

Due to the change of density, g and g do not change --- constant, and according to the formula, V emission decreases.

F float = g ship. The G ship does not change, and the F float does not change. Although the density increases, the volume of drained water becomes smaller, so it does not change.