The steering wheel, the source, the ocean, the wings, the book is knowledge, the book is power, the book is wisdom, the book is life

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• 1. Book is the ocean of knowledge, the wings of power, the source of wisdom, the steering wheel of life!
• 2. How to prove the Pythagorean theorem of square of a + square of B = C with the paper of right triangle
• 3. What is the difference between the components of the force F along the axis ox, oy and the projection of the force on the two axes?
• 4. When the force is perpendicular to the coordinate axis, does the projection of the force on that axis remain unchanged or equal to zero?
• 5. The force method equation is based on the displacement compatibility condition. Then, can the result obtained by the force method satisfy the equilibrium
• 6. How to judge the positive and negative moment with the right-hand spiral rule in University Mechanics?
• 7. Determination of positive and negative torque in torque diagram of mechanics of materials It is said in the book: according to the right-hand spiral rule, the torque T is expressed as a vector. When the vector direction is consistent with the outer normal direction of the cross section studied, t is positive, otherwise it is negative. I want to ask: first, in the right-hand spiral rule, the four fingers point to the direction of torque rotation, or the direction of axis rotation; second, where does the outer normal direction of the cross section point
• 8. Why don't I know how to write when I finish the mechanical physics analysis?
• 9. What's the difference between the pulling direction of the rope and the rod in the force analysis of high school physics mechanics
• 10. High school physics mechanics force analysis is not very good, how can we improve physics
• 11. If a = B, then the following formula may be wrong is ()? A.A plus C = B plus c.b.a minus C = b minus c.c.a multiplied by C = B If a = B, then the following formula may be wrong is ()? a. A plus C = B plus C b. A minus C = b minus C c. A times C = B times C d. A divided by C = B divided by C
• 12. If events a, B and C are independent, then a, B and C are independent of each other, right
• 13. Let a, B and C be three events, then at least one occurrence of a, B and C is expressed as_________ .
• 14. If events a, B, C satisfy the equation a ∪ B = B ∪ C, is a = B true?
• 15. For example, how to keep two decimal places if there is a number in the middle of two circular section decimals with three decimal places
• 16. What is the specific meaning of decimal
• 17. What is the meaning of decimal
• 18. I can give examples of decimal addition and subtraction in my life and calculate them correctly It's urgent. I really need two
• 19. What are adverse selection and moral hazard? Please give examples in real life
• 20. "People destroy natural resources at will" is illustrated by a living example To give examples It's not the consequence