The diameter of steel bar is 32 mm. What is the weight per meter

The diameter of steel bar is 32 mm. What is the weight per meter

[structural designer]
The 32mm steel bar you said should be rebar, with a weight of about 6.31kg/m
Hope the answer will help you!

The diameter of cross section is two centimeters. How much is the steel bar per meter

What is the weight per meter of steel bar with diameter of 28?
What's the weight of 32mm diameter steel bar per meter?

Name = hot rolled round steel standard = GB / T 702-1986 -------- D / mm = 28 round steel cross section area / cm ^ 2 = 6.16 round steel weight / kg / M = 4.83 D / mm = 32 round steel cross section area / cm ^ 2 = 8.04 round steel weight / kg / M = 6.31

What is the buoyancy of a 100 cubic meter hydrogen balloon in the air_____ Cattle, it can carry at most________ The density of air is 1.29 kg / m3, the density of hydrogen is 0.09 kg / m3, the density of hydrogen is 0.09 kg / m3, regardless of buoyancy, g = 10 N / kg
The first blank is 1290 cattle, and the second blank is 1200 cattle
The first empty space is calculated as 1290 n according to the row of ρ - empty GV, but if the floating object f is calculated as G, it should be 90 n. why is it contradictory?

First empty: F floating = ρ empty GV row = 1.29x10x100 = 1290n
The second space: g hydrogen = m hydrogen, g = ρ hydrogen, V sphere, g = 0.09x100x10 = 90N
The ball is balanced by force, upward buoyancy, downward gravity of the ball and gravity of the heavy object
F = g ball + G object
1290n = 90N + G
So g = 1200 n
There is no contradiction
Which point is not clear

A properly loaded hydrogen balloon can hover at 500 meters under gravity, but I don't know how to balance the density of air and hydrogen as the height decreases

Let's take a closer look at the explanation. He said that the buoyancy of a properly loaded hydrogen balloon is equal to that of a gravity balloon. It can hover at an altitude of 500 meters. The air is thin, and its density is reduced, so its buoyancy will drop. However, the weight of a hydrogen balloon is still so much, as long as f buoyancy = f gravity, it will be balanced

The volume density of a hydrogen balloon in the air is 10.0 cubic meters, regardless of the hydrogen balloon itself
Buoyancy (air density: 1.29 kg / m3)

The buoyancy of hydrogen balloon in the air f = ρ air · g · V ball = 1.29 × 10 × 10 = 129n

Use a densimeter to measure the density of alcohol and salt water, and the buoyancy of the densimeter in alcohol_____ Buoyancy in salt water
Why~

Use a densimeter to measure the density of alcohol and salt water. The buoyancy of the densimeter in alcohol is equal to that in salt water
Because no matter in salt water or alcohol, the densimeter is floating on the liquid surface. When floating, the buoyancy of the two times is equal to the gravity of the densimeter itself, so it is equal

The density of an object is 900kg / m3. Put it into kerosene and water. The density of kerosene is 800kg / m3. Calculate the buoyancy ratio and V row ratio

Because ρ matter > ρ oil, the object sinks to the bottom, V row = V matter
Because of ρ

When an object is put into water and alcohol respectively, the buoyancy of the object at rest is 6N and 5N respectively, then the density of the object is______ Kg / m3. (alcohol density is 0.8g/cm3)

(1) If the object is completely immersed in water and alcohol, the buoyancy ratio of the object is: F floating water: F floating wine = ρ water VG: ρ alcohol VG = ρ water: ρ alcohol = 1 × 103kg / m3: 0.8 × 103kg / m3 = 5:4, and the buoyancy of the object at rest is 6N and 5N respectively, then the object is still in water and alcohol

What is the buoyancy of a 450 g paraffin wax when it is placed in water and alcohol respectively? (the alcohol density is 1.03 * 10 ^ 3kg / m ^ 3; the alcohol density is 1.03 * 10 ^ 3kg / m ^ 3);
The density of paraffin is 1.03 * 10 ^ 3kg / m ^ 3)
It's urgent

Because the density of paraffin is the same as that of alcohol, paraffin will be suspended in alcohol. Buoyancy is equal to the gravity of paraffin
F=G=mg=0.45kg*10N/KG=4.5N
When paraffin is in water, because its density is greater than that of water, it will sink into the bottom of water. The buoyancy is equal to the weight of water
Volume = mass / density
Then use the buoyancy formula: buoyancy = density of water * volume of boiled water * G
Think about the formula for yourself and figure it out for yourself