How to calculate the force on the fulcrum of the lever

1.

Conclusion: when the fulcrum is between two forces, the two forces are vertical and the lever is balanced, the force on the fulcrum is always equal to the sum of the two forces

the following is an example:

clipping is shown in the figure. The diameter of pin C and copper wire is d = 5mm. When the applied force P = 200N, calculate the average shear stress of the cross section between the copper wire and the pin τ It is known that a = 30mm, B = 150mm

2. Wechat payment is an innovative mobile payment proct jointly launched by Tencent's well-known mobile social communication software wechat and third-party payment platform TenPay. The following are the related operation methods:
1. Open wechat and open my bank card in my personal information
2. After opening my bank card, click on the top right corner and select transaction record
3. Open "transaction record", select the order to be consulted, such as the first order, and click to enter the order details
4. After entering the order details, we will see the phone after "contact the merchant" to talk with the merchant in detail. If the merchant agrees to refund, the refund will be returned to the bank card you paid for the transaction within 1-15 working days (depending on the bank).

3. Earth element monsters can be killed and mined. There are many Netherland storms

4. Shenzhen North subway station will open on June 22, that is, Wednesday, the day after tomorrow. In addition, lianhuacun subway station is the city section of Longgang line, which will not be opened until the end of this month, that is, June 28. At that time, Shenzhen North Station can take the subway to lianhuacun station. It's the same thing to transfer and take the same line. The ticket price of the subway is calculated according to the mileage. There's no need to leave the station for transfer. The one ticket system is to transfer in the station.

5. Take the subway at Shenzhen North Station
Shenzhen North Station
Longhua line (6 stations)

Civic Center

via 6 stations | estimated time 20 minutes | fare 4 yuan

6. Please use the network map or dial 12580 for more detailed and accurate reply, hoping to help you
take the subway Longhua line, pass 6 stops, reach the citizen center station 382 meters, walk 382 meters, and reach the terminal station

7. Take Metro Line 4 from Shenzhen North Station to citizen center station, transfer to line 2 to Houhai station, take exit E and walk to coastal city

8. Do you remember the refrigerator smashing incident of Haier more than ten years ago? I think Haier has done it. No matter their management mode or their humanistic culture, Haier is now a leader in the instry

9. In fact, Internet Intermediary platforms all have a dream of "decentralization". In terms of instry, home economics, door-to-door service and other o2o are the most prominent, but it is difficult to achieve this dream in reality, because the platform is difficult to solve the problem of information asymmetry. No matter housekeeping, door-to-door service, or real estate (mainly second-hand housing), the Internet platform can't spend a lot of money to collect housing information, because the information is too fragmented, the labor cost is too big, and the gain is not worth the loss. They can only rely on intermediary agencies to do these things, so in my opinion, the intermediary instry is difficult to be subverted within three years.

10. The resultant force is equal to the resultant force of power and resistance. Note that the resultant force is not only added, but also subtracted in the opposite direction. If it is not on the same line, the calculation method is more complicated