What is the force on the fishing rod
Publish: 2021-05-14 11:54:20
1. bitcoin mining is a process of using computer hardware to do mathematical calculation for bitcoin network to confirm transactions and improve security. As a reward for their service, miners can get the Commission included in the transaction they confirm, as well as the newly created bitcoin. Mining is a professional and competitive market. The bonus is divided according to the amount of calculation
the mining method of ant miner is the same as that of Avalon miner, but at present, you need to join a mining pool for mining. If you use your 180g miner to dig ore alone, it is difficult to dig bitcoin.
the mining method of ant miner is the same as that of Avalon miner, but at present, you need to join a mining pool for mining. If you use your 180g miner to dig ore alone, it is difficult to dig bitcoin.
2. The fulcrum is the center of mass of the lever, the force lever must be balanced, otherwise it is a variable force, the lever balance conditions: 1. All forces move to the center of mass, the resultant force is 0. 2. The sum of moments is 0
3. Unknown_Error
4. This question is actually about the fishing weight of the fishing rod. Here's what it means:
the so-called fishing weight of the fishing rod is marked on the barrel, that is, the fishing force, which means that the bending angle of the fishing rod is fixed at 45 degrees, the fishing rod is bent directly below, the tip of the fishing rod is bent to the horizontal position of the end of the grip, and the lifting force of the fishing rod is measured in kilogram, which is not the maximum value of destroying the strength of the fishing rod. Fishing weight is an important indicator of fishing rod, but it is not necessary to pay too much attention to this indicator when the basic net fishing weight is available (both for general and better fishing rods). The main reasons are: 1. Fishing (especially for bigger fish) is actually to lead the fish to the side, not to hang the fish up. Fishing is not to hang the fish!!! Since it is a fishing rod, it is not only the strength of the fishing rod, but also the elasticity and resilience of the fishing rod. Therefore, no one thinks that a piece of hemp rope and steel bar is a good fishing rod. 2. Net fishing weight and rod weight are basically a pair of contradictions. Generally, the net fishing weight of heavy rod is greater than that of light rod. Therefore, there is no fundamental relationship between net fishing weight and the quality of fishing rod. Otherwise, the crane boom will be used for fishing. In addition, it's not very interesting to study the static breaking force of the fishing rod, because fishing is a dynamic process. The skill of adjusting the position and the stress angle of the fisherman often determines whether to cut the line and break the rod when fishing. Otherwise, there will be no technical level of fishing. The performance of a rod is comprehensive. It's inappropriate to overemphasize net fishing weight, or even take it as the only index to measure the fishing rod. It's also a trick for some people who can't make a good rod to mislead their fishing friends. Because it's much easier to make a net fishing rod than to make a rod with good comprehensive performance.
the so-called fishing weight of the fishing rod is marked on the barrel, that is, the fishing force, which means that the bending angle of the fishing rod is fixed at 45 degrees, the fishing rod is bent directly below, the tip of the fishing rod is bent to the horizontal position of the end of the grip, and the lifting force of the fishing rod is measured in kilogram, which is not the maximum value of destroying the strength of the fishing rod. Fishing weight is an important indicator of fishing rod, but it is not necessary to pay too much attention to this indicator when the basic net fishing weight is available (both for general and better fishing rods). The main reasons are: 1. Fishing (especially for bigger fish) is actually to lead the fish to the side, not to hang the fish up. Fishing is not to hang the fish!!! Since it is a fishing rod, it is not only the strength of the fishing rod, but also the elasticity and resilience of the fishing rod. Therefore, no one thinks that a piece of hemp rope and steel bar is a good fishing rod. 2. Net fishing weight and rod weight are basically a pair of contradictions. Generally, the net fishing weight of heavy rod is greater than that of light rod. Therefore, there is no fundamental relationship between net fishing weight and the quality of fishing rod. Otherwise, the crane boom will be used for fishing. In addition, it's not very interesting to study the static breaking force of the fishing rod, because fishing is a dynamic process. The skill of adjusting the position and the stress angle of the fisherman often determines whether to cut the line and break the rod when fishing. Otherwise, there will be no technical level of fishing. The performance of a rod is comprehensive. It's inappropriate to overemphasize net fishing weight, or even take it as the only index to measure the fishing rod. It's also a trick for some people who can't make a good rod to mislead their fishing friends. Because it's much easier to make a net fishing rod than to make a rod with good comprehensive performance.
5.
Force calculation of scaffold pole:
the design value n of axial force of the pole section shall be calculated according to the following formula:
1, when the wind load is not combined,
n = 1.2 (ng1k + ng2k) + 1.4 Σ Nqk
2, combined wind load
n = 1.2 (ng1k + ng2k) + 0.85 × one point four Σ Nqk
where:
ng1k - axial force proced by standard value of self weight of scaffold structure
ng2k -- axial force proced by standard value of self weight of components
Σ Nqk is the total axial force generated by the standard value of construction load, and the value of inner and outer vertical poles can be taken as 1 / 2 of the total internal and external loads of a longitudinal distance (span)
extended data:
the advantages and disadvantages of fastener scaffold are as follows:
1, advantages
1). When the geometric dimension and structure of the scaffold meet the relevant requirements of the specification, the bearing capacity of the single pipe column of the scaffold can reach 15kn ~ 35KN (1.5tf ~ 3.5tf, design value) in general
(2) it is easy to assemble and disassemble and flexible to set up. Because the length of the steel pipe is easy to adjust and the fastener is easy to connect, it can adapt to the scaffolds for buildings and structures of various planes and facades3) relatively economic, simple processing and low one-time investment cost; If the geometric size of scaffold is carefully designed and the turnover rate of steel pipe is improved, the material consumption can also achieve better economic results. Fastener steel pipe frame is about 15kg per square meter of construction steel
The fastener (especially its screw) is easy to lose The tightening torque of bolts should not be less than 40 n · m and not more than 65 n · M2) the members at the joints are eccentrically connected, and the load and internal force are transferred by the anti sliding force, so the bearing capacity is reced
The connection quality of fastener nodes is significantly affected by the quality of fastener itself and workers' operation6. The bearing capacity of the screw is related to many factors, mainly considering the following points:
1. The service life can be calculated according to the actual load and the rated dynamic load of the screw
2. The static load of the screw, that is, the maximum deformation of the ball and raceway contact surface under the static state of the screw, is not greater than the axial load of one tenth of the ball diameter
3, When the axial force of the screw rod increases to a certain extent, it will cause serious radial deformation of the screw rod, which is the buckling load
1. The service life can be calculated according to the actual load and the rated dynamic load of the screw
2. The static load of the screw, that is, the maximum deformation of the ball and raceway contact surface under the static state of the screw, is not greater than the axial load of one tenth of the ball diameter
3, When the axial force of the screw rod increases to a certain extent, it will cause serious radial deformation of the screw rod, which is the buckling load
7. The method and skill of the hand line:
the length of the hand line is related to the fishing ground and fishing method. The common wiring methods are as follows: long pole short line, long pole medium long line, full pole line and super long line. They have their own advantages and disadvantages< (1) long rod, short line, long rod, fixed-point fishing mostly use 8-10m long medium hard rod; For multi-point fishing, e to frequent change of fishing position and fishing point, and the need to always hold the fishing rod with both hands, it is not suitable to use the long rod. Generally, the medium long rod of 6-7 meters is more suitable. The long rod is difficult and inconvenient, and the accuracy of hook delivery will also be affected. The short line means that the wind line from the pole tip to the float is relatively short, which depends on the height of the embankment and the depth of the water body - the bank is high and the water is shallow. The wind line is long, otherwise the wind line is short, generally about 0.5m. The length of the line depends on the depth of the water; The water body is shallow or fishing float is short. This method is suitable for fishing in the still water area where there are many aquatic plants. Long rod and short line are used to poke arch and catch grass
the advantages of long rod and short line are obvious: because the line is vertical up and down, the position of the lower hook is quite accurate. At the same time, because of the short fishing line, fast rod lifting and sensitive response, it has obvious advantages in fishing small fish or shallow water
the drawback of long rod and short line lies in its short line. Because of the short line, every time you change food, take fish and adjust the drift, you have to retract or take off the last few sections of the rod. It's very troublesome to pull out or install the last few sections after changing food and taking off the fish. And then when you catch a big fish, because the line is short, you can't get through the fish, so you often break the hook
(2) long rod medium long line long rod medium long line is the most suitable for multi-point fishing, generally 7 m rod with 5 m line, 6 m rod with 4.5 m line. Because the line is shorter than the pole, the line is very convenient. In addition, with centipede drift, you can avoid the trouble of going up and down again every time you change the fishing point, so it has obvious advantages for multi-point fishing and swimming fishing
(3) as the name suggests, the line with the same length as the pole, but not necessarily. Many fishermen in the use of this method, mostly take slightly shorter than the length of the rod fishing line (generally short 20-30 cm), in order to line convenient. The reason why most of the hand rod fishing uses the line with the same rod is that the operation is very convenient: changing the t to get the fish, raising the rod with one hand, and reaching the hook with the other hand, it only takes three or two times to finish the work. Qigan line is most suitable for fishing in deep water area without weeds. The fishing point can be near or far away, and you don't have to be afraid to catch big fish. With the advantage of line length, you can work with big fish as much as possible
the deficiency of the parallel line is also e to the long line and the far fishing point, which makes it difficult for the t to fall accurately
(4) super long line means that the fishing line is as long as the fishing rod, which is suitable for circling in large water surface and deep water area. For example, the fishing spots in rivers, lakes and reservoirs are more than ten meters away from the shore (plus the water depth is nearly 20 meters). Without the sea pole, we have to use this method to solve the problem. This kind of super long line is quite troublesome to operate. Whether it's lowering the hook, changing the t or taking the fish, it's not as easy and convenient as the full pole line. If it's not done well, there's even the danger of hanging the hook. However, it also has advantages: in deep water area with large water surface, no matter how long the rod is, it is difficult to detect. Only this kind of super long line can break through this difficulty. Another point is that the length of the fishing line can not be changed because the fishing rod must be supported when throwing, which creates conditions for accurate fishing point (distance).
this method is generally used to catch big fish, big hook and big t, and the rod can only be raised when the fish information is accurate. Because it's too much trouble to lift the rod and change the t, it's not easy to lift the rod.
the length of the hand line is related to the fishing ground and fishing method. The common wiring methods are as follows: long pole short line, long pole medium long line, full pole line and super long line. They have their own advantages and disadvantages< (1) long rod, short line, long rod, fixed-point fishing mostly use 8-10m long medium hard rod; For multi-point fishing, e to frequent change of fishing position and fishing point, and the need to always hold the fishing rod with both hands, it is not suitable to use the long rod. Generally, the medium long rod of 6-7 meters is more suitable. The long rod is difficult and inconvenient, and the accuracy of hook delivery will also be affected. The short line means that the wind line from the pole tip to the float is relatively short, which depends on the height of the embankment and the depth of the water body - the bank is high and the water is shallow. The wind line is long, otherwise the wind line is short, generally about 0.5m. The length of the line depends on the depth of the water; The water body is shallow or fishing float is short. This method is suitable for fishing in the still water area where there are many aquatic plants. Long rod and short line are used to poke arch and catch grass
the advantages of long rod and short line are obvious: because the line is vertical up and down, the position of the lower hook is quite accurate. At the same time, because of the short fishing line, fast rod lifting and sensitive response, it has obvious advantages in fishing small fish or shallow water
the drawback of long rod and short line lies in its short line. Because of the short line, every time you change food, take fish and adjust the drift, you have to retract or take off the last few sections of the rod. It's very troublesome to pull out or install the last few sections after changing food and taking off the fish. And then when you catch a big fish, because the line is short, you can't get through the fish, so you often break the hook
(2) long rod medium long line long rod medium long line is the most suitable for multi-point fishing, generally 7 m rod with 5 m line, 6 m rod with 4.5 m line. Because the line is shorter than the pole, the line is very convenient. In addition, with centipede drift, you can avoid the trouble of going up and down again every time you change the fishing point, so it has obvious advantages for multi-point fishing and swimming fishing
(3) as the name suggests, the line with the same length as the pole, but not necessarily. Many fishermen in the use of this method, mostly take slightly shorter than the length of the rod fishing line (generally short 20-30 cm), in order to line convenient. The reason why most of the hand rod fishing uses the line with the same rod is that the operation is very convenient: changing the t to get the fish, raising the rod with one hand, and reaching the hook with the other hand, it only takes three or two times to finish the work. Qigan line is most suitable for fishing in deep water area without weeds. The fishing point can be near or far away, and you don't have to be afraid to catch big fish. With the advantage of line length, you can work with big fish as much as possible
the deficiency of the parallel line is also e to the long line and the far fishing point, which makes it difficult for the t to fall accurately
(4) super long line means that the fishing line is as long as the fishing rod, which is suitable for circling in large water surface and deep water area. For example, the fishing spots in rivers, lakes and reservoirs are more than ten meters away from the shore (plus the water depth is nearly 20 meters). Without the sea pole, we have to use this method to solve the problem. This kind of super long line is quite troublesome to operate. Whether it's lowering the hook, changing the t or taking the fish, it's not as easy and convenient as the full pole line. If it's not done well, there's even the danger of hanging the hook. However, it also has advantages: in deep water area with large water surface, no matter how long the rod is, it is difficult to detect. Only this kind of super long line can break through this difficulty. Another point is that the length of the fishing line can not be changed because the fishing rod must be supported when throwing, which creates conditions for accurate fishing point (distance).
this method is generally used to catch big fish, big hook and big t, and the rod can only be raised when the fish information is accurate. Because it's too much trouble to lift the rod and change the t, it's not easy to lift the rod.
8. The reasons are as follows: 1. Under the same unit load, the internal force of vertical bar, small cross bar and large cross bar decreases; 2. As the small cross bar becomes shorter, the line stiffness increases, and the constraint of the opposite bar is strengthened, so as to improve the stability of the scaffold. From the above, and through the relevant tests, it is shown that the critical load of the scaffold decreases with the increase of the transverse distance of the vertical pole. If the transverse distance is changed from 1050 mm to 1200 mm and other erection parameters remain unchanged, the scaffold erected in this way does not meet the safety requirements. It should be recalculated, the internal force of the member increases, and the calculated length of the upright pole becomes longer. If it has been erected, it can be solved by densifying the spacing of the wall connecting members (two steps and two spans) and adding double upright poles at the lower part
according to the height of the house, load type (structure construction or decoration construction), wind load and number of operation floors, the scaffold erection size should be determined according to the specifications and previous experience, and then the relevant erection parameters should be checked after calculation.
according to the height of the house, load type (structure construction or decoration construction), wind load and number of operation floors, the scaffold erection size should be determined according to the specifications and previous experience, and then the relevant erection parameters should be checked after calculation.
9. There are many principles involved here. It is said that the Japanese pole is designed according to the derivative equation. In addition, it has something to do with the strength of the carbon cloth itself. The mechanics of materials is amazing. Then those big manufacturers also have their own exclusive technology. For example, Jizhou and Gan choose a certain section of a certain kind of bamboo to splice. Dawa's plant theory and v-grafting technique. All in all, various factors and a lot of tests determine the proction process of a rod
in addition, fish can't be pulled up with a rod. It can only be said that they are pulled over with a rod, and the bigger fish are copied from the net
from the section of your hand to the mouth of the fish and the section of the rod, it's just a section in the middle of the power transmission. The fish line further forward is thinner, it just plays a brick in a bridge between you and the fish. It's not the rod that pulls the fish
the common reasons for breaking the rod are that the rod is slightly bent and the included angle is too small. For example, flying fish do not need to the net when they come up. For example, when the fish do not want to put down the rod, they still hold it. For example, when a fish struggles to pick up the fishing line, it is easy to break the rod.
in addition, fish can't be pulled up with a rod. It can only be said that they are pulled over with a rod, and the bigger fish are copied from the net
from the section of your hand to the mouth of the fish and the section of the rod, it's just a section in the middle of the power transmission. The fish line further forward is thinner, it just plays a brick in a bridge between you and the fish. It's not the rod that pulls the fish
the common reasons for breaking the rod are that the rod is slightly bent and the included angle is too small. For example, flying fish do not need to the net when they come up. For example, when the fish do not want to put down the rod, they still hold it. For example, when a fish struggles to pick up the fishing line, it is easy to break the rod.
10. (1) If other conditions remain unchanged, the longer the length of the fishing rod, the larger the resistance arm, while the power arm remains unchanged. According to the lever balance condition, the greater the power, that is, the greater the force of the hand-held fishing rod 2) The fisherman raises a fish weighing 5N from the water surface by 2m. He overcomes the gravity of the fish to do work, and then moves 1m horizontally. In this process, he does not do work, so he overcomes the gravity of the fish to do work w = GH = 5N × 2m = 10J 2 10
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