Decomposition method and principle of force

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• 1. When an object is subjected to multiple forces and remains stationary, only one of the forces on the object gradually decreases to zero and then gradually increases, and the other forces remain unchanged until the object returns to the initial force situation, then the object in this process () A. The velocity of an object increases gradually from zero to a certain value B. the velocity of an object increases gradually to a certain value and then decreases gradually to zero C. the velocity of an object increases gradually from zero to a certain value and then decreases gradually to another value D
• 2. On the decomposition of force, the following statement is correct: a. the decomposition of force should be carried out according to the actual effect of known force; B. the object on the inclined plane As for the decomposition of force, the following statement is correct A. The force should be decomposed according to the actual effect of the known force B. The gravity of an object on an inclined plane must be decomposed into the downward sliding force along the inclined plane and the downward positive pressure perpendicular to the inclined plane C. The parallelogram rule restricts the force to be decomposed into two components D. After the force is decomposed into component forces, the component forces and resultant forces should be included in the formula at the same time
• 3. High school physics - force decomposition: when a force is decomposed, it is usually decomposed according to the actual effect of the force "When a force is decomposed, it is usually decomposed according to the actual effect of the force." How to understand this principle? Please explain thank you.
• 4. Decomposition idea of physical force - there are many forces acting on an object. If a force is selected, how to divide the force? 1. Why is the decomposition of academic ability horizontal and vertical at present? (orthogonal decomposition) but I always feel that this method is not acceptable 2. How to decompose a force without knowing its composition?
• 5. How to understand the decomposition of power. I don't know which power to find when I do the problem. Who will teach me There is a circle center and the ground inclined to pull a rope to the left and down, and then there is a horizontal right force F = 100N in the horizontal direction of the circle center. At this time, the angle between the tension of the rope and the ground is 37 ° to find the tension of the rope
• 6. 1. A piece of wood with uneven thickness, 2.4 meters in length. When the left end supports the ground, it needs 540 n to lift up the right end; when the right end supports the ground, it needs 360 n to lift up the left end. Find out (1) the gravity of the wood; (2) the distance from the center of the wood to the right end 2. AB is a straight board (excluding mass), O is the fulcrum, Ao = Bo = 0.65M, there are two balls a and B on the right side of the board, BC = 0.1M, m a = 0.3KG, M B = 0.2kg, the a end of the board is tied with a string, the board is in horizontal balance, if a ball moves at 0.13m/s, B ball moves at 0.1m/s to a at the same time, how long does it take AB to start to rotate around o? I also have the answers, the key is to solve the problem steps, but do not write a series. If you need to use ternary linear equations, please also write the steps of ternary linear equations, because I forgot the ternary linear equations. If you want to score, wait until you choose the best answer, because I'm afraid no one will answer, then the score will not come back
• 7. A problem of uniform circular motion in Physics Under the action of external force, particle a moves in a clockwise circular motion with uniform velocity in the vertical plane. The orbit radius is r, and point P is the highest point in the vertical plane. When particle a passes through point P, a particle B just moves from point P with the velocity v = Gr / 2 (there is an open radical outside, starting to do horizontal throwing motion. After a period of time, two particles collide, Solution: the acceleration of particle A in uniform circular motion. (the acceleration of gravity is g)
• 8. Research on uniform circular motion When an object slides down with a smooth sphere, the velocity at the highest point is 2m / s, and the radius of the sphere is 3M? The answer is that the angle between the object and the center of the circle is 37 degrees
• 9. A physics problem about uniform circular motion On a smooth horizontal plane, there are two balls a and B of the same mass. A and B are connected by a light rope. B ball is connected by a light rope to the fixed point O. A and B balls move uniformly around o point at the same angular velocity Q: what are the forces on balls a and B I want to know how to analyze their stress
• 10. Physics problem: uniform circular motion 4. As for the light rod and light rope, one end of them is connected with a small ball, and the other end is pulled up by hand, so that they can make circular motion in the vertical plane A. It is impossible for a small ball connected by a rope to move in a circle at a uniform speed B. It is also impossible for a ball connected by a rod to move in a uniform circular motion C. The force of the rope on the ball must not work D. The force of the rod on the ball must not work The answer is: why is AC? How does light stick work on the ball? But isn't the supporting force component of the light bar the same as that of the light rope? Can you draw a picture?
• 11. Decomposition of force Two points AB on two vertical wooden poles are equal in height. A smooth light rope is tied at two points ab. a hook is hung on the rope in the middle and a heavy object is tied below. Now, raise the right rope end from point B along the pole to point B '(the rope length is greater than the distance between ab'), and the tension of the light rope between two points ab 'will remain unchanged compared with before moving. Why remain unchanged? Why is the rope length greater than the distance between ab'?
• 12. 6.4 factorization of the simple application of the exercise book, soon! (x^2y-xy^2)÷(x-y)= (a^2-9)÷(a+3)= (m^2+2mn+n^2)÷(m+n)= Calculation (4x ^ 2-4x + 1) / (1-2x)= A.2x+1 B.2x-1 C.1-2x D.-1-2x calculation: (a^2-64)÷(a-8) (3x^3y^2+6x^2y^3)÷(x+2y) (-9m^2+4n^2)÷(3m+2n) Solve the following equation: (process complete) x^2+2x=0 9x^2-4=0 calculation: (4a^2-20ab+25b^2)÷(5b-2a) (1-16a^4)÷(4a^2+1)÷(2a+1) solve equations: -1/2x^2+2x=0 (3a-4)^2=25 Right away,
• 13. (1).x^2+1=2x (2) In factorization, when x ^ 2 + ax + B, Xiaomin misinterprets B, the result of factorization is (x + 2) (x + 4), XiaoCong misinterprets a, the result of factorization is (x + 1) (x + 9), find the value of a and B, and write the correct process of factorization
• 14. A classroom is 8 meters long and 6 meters wide. How many decimeters long square tiles are used to lay the floor? How many tiles do you need?
• 15. Let the population x obey the normal distribution n (μ, σ ^ 2), x1, X2,..., xn be a sample from the population, let u = n ^ (1 / 2) * (x ˉ - μ) / σ, then d (U) =? Ask for detailed explanation
• 16. There are two squares of different sizes. The difference in circumference is 20cm and the difference in area is 75cm. What is the area of the big square?
• 17. What is the root of x ^ 3 + lgx = 18
• 18. As shown in the figure, a circular shear is put together into an approximate rectangle. Given that the perimeter of the rectangle is 33.12 cm, what is the area of the shadow in square centimeter? It's better to make the details clear,
• 19. How to find the maximum value of sine function
• 20. A circle is divided into several parts along the radius to form an approximate rectangle. The circumference of the rectangle is 4cm more than the circumference of the circle. What is the circumference of the circle and its area