Does buoyancy change with depth? 1. Is the object exerting force necessarily the object under force? 2. When the helicopter rises at a constant speed, must the lifting force produced by the propeller be greater than that of the helicopter when it stops in the air?

Does buoyancy change with depth? 1. Is the object exerting force necessarily the object under force? 2. When the helicopter rises at a constant speed, must the lifting force produced by the propeller be greater than that of the helicopter when it stops in the air?

Buoyancy f = ρ GV, so when an object has been falling underwater, its volume is a fixed value, so the volume of liquid discharged by it will be constant from a certain time. If the liquid density is constant, the buoyancy will be constant
The object exerting the force must be the object under the force, because the action of the force is mutual
When the helicopter rises at a constant speed, the lifting force is equal to the gravity of the aircraft; when the helicopter stops in the air, the lifting force of the propeller is equal to the gravity of the aircraft, so it must be equal to

Five eighths of a meter is one eighth of a meter?

5 meters
Because five eighths ／ one eighth = 5
So it's 5
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One eighth of seven meters is as long as one meter

Seven eighths

A piece of steel three eighths of a meter long weighs four fifths of a ton

A piece of steel three eighths of a meter long weighs four fifths of a ton. How many tons does this steel weigh one meter long
4 / 15 / 8 = 32 / 45 (ton)
It is several meters long and weighs one ton
3 / 8 △ 4 / 15 = 45 / 32 (m)

Three eighths of a meter is equal to one eighth of a few meters

3 meters

One eighth of three meters is what part of one meter?

Each piece is one eighth of the wire, and three eighths of a meter can be regarded as three eighths of a meter
What we used to do

1 / 5 of 3 meters is as long as 3 / 5 of 1 meter. Right or wrong?

Yes
It's three fifths of a meter
That is 0.6m

Is seven eighths of one meter as long as one eighth of seven meters?

It's the same length! It's seven eighths of a meter

X to 24 is four and three quarters to seven and one eighth

10: 24 = 4 and 3 / 4: 7 and 1 / 8
X：24=19/4：57/8
57/8X=19/4×24
57/8X=114
X=114×8/57
X=16

How much is three eighths plus one fifth minus one eighth

It's nine out of twenty
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