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

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• 1. 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
• 2. 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?
• 3. A problem of uniform circular motion in physics As shown in figure a, the acrobat rides a motorcycle to make a uniform circular motion on the inclined circular wall (i.e. running away at high speed). When the speed is V, there is no friction force to provide centripetal force. The inclined circular wall is called o angle with the horizontal plane, and the bottom radius is R. what is the height h of the acrobat from the ground at this time? To find the process, I said I couldn't draw. Come on, please tell me "when the speed is V, there is no friction to provide centripetal force." what does that mean?
• 4. An eighth grade physics problem about pressure, urgent! Give the solution In April 2010, a fire broke out on an undersea oil exploration platform in Mexico. The leaked oil caused a dispute between oil companies and scientists on the amount of leakage. Xiao Ming thought that the oil density should be measured before estimation. He designed a device as shown in the figure, which contained oil in the cup and put a cube with a mass of 5.6 × (10 negative cubic) kg and a side length of CM, 3 / 4 of the volume is immersed in oil, and the depth of oil is 0.1M (g = 10N / kg) 1. What's the density of oil? (keep two decimal places) 2. How strong is oil to the bottom of the cup? Picture - let me describe it It's a cup with a narrow top and a wide bottom. Three quarters of the object is immersed in water OK, I'll add more
• 5. On the problem of physical pressure, we need the whole process -- 1. The average pressure produced by the water jet from the spray gun on the coal seam is 10 to the fifth power Pa. the pressure on the area of 1 square centimeter of the coal seam surface is calculated. 2. Stapler is a common office tool, which applies a lot of pressure knowledge. Find a stapler, carefully observe its structure, and analyze how it applies the pressure knowledge
• 6. A physics problem about pressure When a tornado occurs, the air pressure outside the house drops sharply to 90kpa. When the doors and windows are closed, it can be considered that the indoor air pressure is the standard atmospheric pressure, roughly taken as 100KPA. If the indoor roof area is 100 m2, how much n is the difference between the internal and external pressure on the roof, which is enough to lift the roof
• 7. Put 8N water in a container with a weight of 2n and a bottom area of 0.01m2, and the depth of water in the container is 0.05m. Put it on the horizontal table, as shown in the figure (g = 1On / kg)
• 8. The three solid cubes a, B and C are respectively placed on the horizontal ground, and their pressures on the horizontal ground are equal. It is known that ρ a ＞ ρ B ＞ ρ C. If a force in the same direction along the vertical direction is applied to the center of the three cubes (the applied force is less than the gravity of the cube), so that the pressures of the three cubes on the horizontal ground are still equal, then the pressure is equal The magnitude of the applied force () A. It must be f a ＜ F B ＜ F C B. it must be f a = f b = f C. It may be f a ＞ F B ＞ f C. all the above situations are possible
• 9. The ion smoke sensor mainly used for fire alarm is shown in the figure. There are electrodes 2 and 3 in the net cover 1. A and B are connected to the power supply. 4 is a small piece of radioisotope americium 241, which can emit a kind of particles that can easily ionize the gas. Usually, the particles emitted by americium ionize the air between the two electrodes; a. When a fire breaks out, smoke enters the net cover, and the smoke particles absorb the ions in the air and the particles emitted by americium, causing the current to change. The circuit detects this change and gives an alarm A. Americium 241 emits α particles, and the current increases when there is smoke. B. americium 241 emits α particles, and the current decreases when there is smoke. C. americium 241 emits β particles, and the current increases when there is smoke. D. americium 241 emits β particles, and the current decreases when there is smoke
• 10. Orthogonal decomposition method to teach me How to set up the equation of orthogonal decomposition should be clear How did F1 = sin37 * F, F2 = cos37 * f come from? How did g-sin37 * f come from? How did coordinates come from? I was very careful
• 11. 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)
• 12. 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
• 13. 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
• 14. 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?
• 15. 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.
• 16. 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
• 17. 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
• 18. Decomposition method and principle of force
• 19. 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'?
• 20. 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,