All formulas of buoyancy Buoyancy knowledge explains all the variant formulas of buoyancy

All formulas of buoyancy Buoyancy knowledge explains all the variant formulas of buoyancy

The calculation of buoyancy formula assumes that a cube is submerged in water, f floating = ρ GH2 * s - ρ GH1 * s (immersed in water) = ρ GS * Δ H = ρ liquid GV discharge (general) = g discharge. When the object is suspended or floating, f floating = g matter = m matter g indicates that (1) H2 is the distance from the lower surface of the cube to the water surface, H1 is the distance from the upper surface of the cube to the water surface

All the formulas about buoyancy

F = g object (used when the object is floating or suspended)
F = g row (Archimedes principle, can be used at any time)
F = G-F (gravity difference method)

Calculation formula of buoyancy
All formulas

F=p*g*v
F: Buoyancy
p: Liquid density
g: Local acceleration of gravity
v: The volume of the liquid to be drained (that is, the volume to be injected into the liquid)

Mechanical efficiency formula of pulley block!
Yes w have / W total x 100%
Is w FS or GH

Useful work: GH
Total power: FS

Formula for pulley block
There's a pulley that goes up. How much does the rope go up? That formula

The free end movement distance of the rope SF = 2 times of the weight movement distance SG

What are s and h in the formula of pulley block
S = H F: the tension on the free end of the rope
S and H are distance and height. What's the difference between them

S generally refers to the distance of acting force at the free end of pulley block (i.e. the distance that people pull the rope)
And H is the height of the weight hanging under the pulley
The formula should be s = NH, (s = h, f is wrong, s is the distance, n is the constant, f is the force, not the same physical quantity, can't be connected by equal sign)

How to find n in F = NH

In the pulley block, it should be s = NH, and the number of rope strands around the moving pulley is n. generally speaking, if there is a graph, you can directly count the number of rope strands; you can also use n = f / g (you can only use it when you have little extra work), and you can also find the key words in the title, such as: workers use a certain pulley block to stand on the ground to pull objects

Please explain why in the pulley block, the relationship between the moving distance s of the rope end, the lifting distance h of the weight and the number of segments n of the rope is s = NH;

When the weight rises h, each of the N segments of the rope rises s / N, so s = NH

Why is (1 + H) ^ n greater than or equal to 1 + NH

1. Mean inequality
(1+h)^n+(n-1)+(1-n)
=[(1+h)^n+1+1+1+...1]+(1-n)>=n[(1+h)^n]^(1/n)+1-n=1+nh
2. Binomial expansion (1 + H) ^ n = 1 + NH + C (n, 2) H ^ 2 +. > 1 + NH
Hope to be useful to you

Why is n power of (1 + H) greater than or equal to 1 + NH~~~~~~~~~~~~~~~

1. Mean inequality
(1+h)^n+(n-1)+(1-n)
=[(1+h)^n+1+1+1+...1]+(1-n)>=n[(1+h)^n]^(1/n)+1-n=1+nh
2. Binomial expansion (1 + H) ^ n = 1 + NH + C (n, 2) H ^ 2 +. > 1 + NH
Hope to be useful to you