How to calculate the friction moment of rotating shaft? There is mutual pressure between two rotating surfaces, resulting in friction torque. How to calculate this friction torque?

Friction f = μ n, n is the positive pressure, friction moment M = fr, R is the distance from the contact surface to the center of the circle

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1. The calculation of the moment of gear rotation When the cylindrical spur gear rotates, the pitch diameter of the driven wheel d = 30cm, the meshing force F of the driving wheel f = 1kn, the pressure angle a = 20 ° and the transmission moment M. F of the meshing force F to the center of the driven wheel M. f has been solved M. f = M. F1 + M. F2, M. F1 passing through the moment center = 0, then M. f = M. F2 = 1 / 2fcosa = 141n. M, when is this 1 / 2fcosa, and how is this 141 obtained
2. Is it necessary to calculate the moment fulcrum without rotation?
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4. As shown in the figure, the uniform rectangular thin plate with mass m = 1kg and length L = 0.8m is still on the water table, and its right end is flat with the edge of the table. The dynamic friction coefficient between the plate and the table is μ = 0.4. The horizontal force F = 5N is used to push the thin plate to the right to make it turn down the table, and the work done by force F is at least (G is taken as 10m / S2) () A. 1JB. 2JC. 1.6JD. 4J
5. Practical application of moment calculation If the power of the reducer is 0.75KW, the output speed is 5R / min, t = 1432.5n. M. that is to say, the output torque of the shaft is 1432.5n. M (if the shaft meets the strength requirements). The reducer is directly connected with the shaft, how to calculate how much weight can be put on the chain conveyor belt with this 1432.5n. M torque?
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7. It is known that | vector OA | = | vector ob | = | vector OC |, the angle between vector OA, vector OB and vector OC is 120 ° to find the vector OA + vector ob + vector OC
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11. Given. Z = (| Z | - 1) + 5I, find the complex Z
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16. (4 and 3 / 2) - (0.5-3 and 1 / 2)?
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