Detailed explanation of physical displacement formula in grade one of senior high school The more detailed the better ~ ~ there is a reward ~ ~ ~ if you don't give a detailed answer, there will be no reward

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1. Explain to me how to use these physical formulas and their significance (I'm a senior one) 1. F = ma and f-f = ma 2. F = friction coefficient n = friction coefficient mg How are they used, how are they equal, what are the differences in usage and what are the meanings in physics? The symbol "friction coefficient" can't be worked out
2. Excuse me: how to prove the pendulum length formula t = 2 π √ (L / g)? I'm a freshman in high school, thank you!
3. A simple mathematical operation problem (81.3-81.38×0.9)÷0.25
4. Simple operation problem of adding positive and negative numbers from one to mathematics （+1）+（-2）+（3）+（-4）+.+（2005）+（-2006）+2007
5. 37×1/4+18×0.25+45×25% 2 / 15 △ 1 / 4 + 80% × 2 / 15 as soon as possible
6. How many integers have the same quotient and remainder after being divided by 13?
7. Zhang Ming and Li Gang both eat in the canteen. The ratio of their meal tickets is 4:3. Zhang Ming uses 6 yuan meal tickets every day, and Li Gang uses 5 yuan meal tickets every day. When Li Gang's meal tickets are used up, Zhang Ming still has 10 yuan meal tickets. It turns out that each of them has () yuan meal tickets
8. What is the product of 888888... 88888 (50 8) * 6666... 666 (50 6) divided by seven?
9. Ask mathematical experts to help me calculate a single unknown number, including the calculation of the third power~ The equation is: d3=4175.92d+149.14d2+233.776*106 What's the answer to the calculator?
10. What is a term without unknowns
11. All the useful formulas in Chapter 2 of physics are best explained and explained
12. All the formulas in the physics, chemistry and mathematics book of grade one of senior high school should be complete! Thank you~
13. What's the formula for a 90 degree triangle? A 90 degree triangle The first line is 2.03 meters The second line is 23 meters Excuse me? How long is the third line? What are the other two angles?
14. Mathematical trigonometric formula In the triangle ABC, ab = AC, SINB = 5 / 13, find the value of sina, cosa and Tana?
15. Mathematical inverse trigonometric formula What is 30 ° cotarctan
16. Seeking trigonometric formula in Mathematics cos(A+B)= Want to correspond to a few, there are half angle formula and so on
17. What are the numbers in mathematics?
18. What are the numbers in math? Please 3Q Prime numbers. Prime numbers
19. Number games in Mathematics Step 1: take a natural number N1 = 5 and calculate N2 / 1 + 1 to get A1; Step 2: calculate the sum of the numbers of A1 to get N2, and calculate N2 / 2 + 1 to get A2; Step 3: calculate the sum of the numbers of A2 to get N3, and then calculate N2 / 3 + 1 to get A3; . And so on, then a2011=____________ .
20. What is the definition of digital