The topic of buoyancy, the topic of buoyancy

The solution to the problem of buoyancy.

f=density*g*v-row;

Therefore, density (wine) * v row = density (water) * v row = density (copper sulfate) * v row;

v Row (water) = Row (wine); wine) = 1*s;

wine); So Mi (copper sulphate) - Mi (wine) =;

Dense (copper sulphate) =

b. Float upward, and some candles are exposed to the water.

Because at the beginning, F floats = g wax, after cutting off a part, G wax decreases, F floats > G wax'

So the candle will float;

It should be b. The iron sticking sheet is only used to keep it floating upright, and does not significantly change the specific gravity of the whole body, so an upright candle with a specific gravity less than water will have the phenomenon described in b after the head is cut off.

It is the answer to choose C, inhalation, which causes the gas problem in the bottle to decrease, the air pressure decreases, and the water tightens the skin inside the bottle from the lower catheter, which is the average mass of the bottle as a whole increases, and the gravity becomes larger. The buoyancy of the bottle is related to the volume of the water discharged, the volume remains the same, the buoyancy remains the same, so the gravity is greater than the buoyancy to sink (that is the cork, there are two holes on the cork, one wears a long conduit and the other is a short conduit, and if it is not plugged, the short conduit connects the inside and outside of the bottle).

I hope it will help you, if you don't understand, you can ask again, I wish you progress in your studies.

Sink. And the buoyancy remains the same. Inhalation, which causes the air pressure inside the bottle to decrease, and water from the outside enters the bottle, causing gravity to increase. And buoyancy is related to the volume of the bottle, the volume does not change, the buoyancy does not change, so it sinks. Beg.

Sinking, its buoyancy remains unchanged, the volume of water discharged remains unchanged, its own gravity increases, and the buoyancy "gravity, sinks."

Small. Decline.

The bowl sinks into the water, indicating that the buoyancy of the harvest at this time is less than the specific gravity, and the weight of the drainage when floating is equal to the weight of the bowl, and the sinking into the water only increases the volume of the bowl, and the density of the bowl is greater than that of water, so the water surface will fall.

The key to this topic is actually two: "at this time", which refers to sinking to the bottom. Since it is formed at the bottom, the bowl is subjected to 3 forces, buoyancy, gravity, and support.

That is: buoyancy + support force = gravity, so buoyancy is less than gravity. Since the buoyancy is less than the gravitational force, the V-row becomes smaller, so the liquid level drops.

Set the volume of ice to v

g ice = f float.

Ice * g * v = water * g * (v-1000) substitute data to find v=10000f float = water * g * (v-1000) = 1 10 3 * 10 * (10000-1000) =