F l calculation force

1. As shown in the figure, we know the size relationship between the power arm and the resistance arm, and the size of the resistance g. we can calculate the size of F by using the balance condition of the lever × L 1 =G × So the answer is: 20n

2. The moment is the vertical distance from the line of action of the force to the fulcrum, which should be f × 50. L is the arm of force
when the line of action of the force is perpendicular to the arm of force, the magnitude of the moment is fl

3. Within the elastic limit, the elongation △ l of the spring is proportional to the tension F,
expressed by the formula F = k ·△ L,
where k is the stiffness coefficient of the spring (k is a constant).

4. The original length of the spring is l0, and then it is L Δ l=— F=k Δ L is that the elongation is proportional to the tensile force

5. In the Rubik's cube formula,
u is the top surface, u is the top surface turning 90 degrees clockwise, u & # 39; It means that the top surface turns 90 degrees counter clockwise
F means the front, the face closest to you
L means the left side

this should be a middle-level formula of order 5, if it is a novice, it is recommended to use the reced order formula

6. I = I-beam
25A = dimension = height leg width waist thickness
250mm 116mm 8.0mm
F-L axis I-beam model 25A

7. Festival
English; festɪ VL] beauty [&; fɛ stə və l]
n. festivals; Nodal stage; Banquet, performance;

8. First, the mass of the rod is concentrated in the center. The angle between the rod and the vertical direction is Θ
according to the energy conservation MV & # 178/ 2=mgh
h=L(1-cos Θ)/ 2
v=√gL(1-cos Θ)= f( Θ)
calculation force
F = mgsin Θ= g( Θ)
DV = ADT
F Θ) And G Θ) The results were
DF Θ)=[ g( Θ)/ m]dt
mdf( Θ)/ g( Θ)= DT
integral is
t = ∫ MDF Θ)/ g( Θ)＋ C
0< Θ ≤ π/ 2
bring in the function to try to simplify yourself

ask weakly, what is the level of University, but you seem to have made a mistake.

9. You can understand that a film is like a piece of paper. When the upper surface of the paper contacts with the air, surface tension is generated on the contact surface. When the lower surface of the paper contacts with the air, surface tension is also generated. Therefore, two surface tensions should be calculated.

10. Final
English; faɪ NL] beauty [&; faɪ nə l]
adj; Decisive; decisive; Unchangeable
n.
finals; ending; final exam;