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The density of alcohol is 0.8 × 10 & sup3; kg / M & sup3;, and how much buoyancy does a 500 CM & sup3; iron block get when it is immersed in alcohol?
F = ρ alcohol GV = 0.8 × 10 & sup3; kg / M & sup3; × 9.8n/kg × 0.0005m & sup3; = 39.2n
Students, do you know the printing process of primary school mathematics textbooks? 32 pages of textbooks are printed on both sides of a large piece of paper. After folding in half, the area of each side is 344.875 square centimeters. After binding and trimming, it becomes the textbook we see. What is the volume of large paper used to print textbooks? What else can you find when you look at the copyright page of textbooks? How to do it
Area of large paper = 334.875 * 32
=10716 square centimeters
As shown in the figure, △ ABC is an equilateral triangle. Now take a point D on BC and connect ad. rotate △ abd around point a by 60 ° to the position of △ ace and connect de. what kind of triangle is △ ade? Explain the reason (please help,
Delta ade is an equilateral triangle
It can be seen from the rotation of △ abd around point a by 60 ° to the position of △ ace
Angle DAE = 60 ° ad = AE
So delta ade is an equilateral triangle
A + (the square of B) is equal to the square of 12 a plus the square of 7b?
A + (the square of B) is equal to the square of 12a plus the square of 7b
Then 11a ^ 2 + 6B ^ 2 = 0
So a = b = 0
The above formulas are all 0
Missed the sun, missed the moon, now only the stars,
No star is dark
The science topic of grade three!
Dilute hydrochloric acid with equal mass and equal mass fraction reacts with sufficient iron and zinc respectively to release hydrogen
A more iron than zinc B more zinc than iron C as much D can't be sure which one is more
Is it related to the activity of zinc and iron
Choose C
When iron and zinc are excessive, all dilute hydrochloric acid reacts, and all h in dilute hydrochloric acid is replaced
The metal activity is related to the reaction rate, but not to the mass of the product
(x ^ 2 + 5x + 4) (x ^ 2 + 5x + 6) + 1 factorization,
RT
The original formula = ((x ^ 2 + 5x + 5) - 1) ((x ^ 2 + 5x + 5) + 1) + 1
=(x^2+5x+5)^2-1+1
=(x^2+5x+5)^2
A rectangular lawn, 50 meters long and 30 meters wide, with 12000 scale to draw this lawn plan
50 m = 5000 cm, 30 m = 3000 cm, 5000 × 12000 = 2.5 (CM), 3000 × 12000 = 1.5 (CM). Therefore, the length of the rectangular lawn is 2.5 cm and the width is 1.5 cm
Mathematician's story, about 20 words, two,
When Hua Luogeng was in middle school, in a math class, the teacher gave the students a famous problem: "there is a number, three, three, two; five, five, three; seven, seven, two. What's the number?" when we were thinking, Hua Luogeng stood up and said: "23" his answer surprised the teacher
The reciprocal formula of the difference between the squares of two numbers
For example, 1 / (x ^ 2-A ^ 2) = 1 / 2A [1 / (x-a) - 1 / (x + a)] to find the complete formula 1 / (x + b) (x + C) =?
X/(x+b)(x+c)=?
1/(x+b)(x+c)=1/(c-b) *[1/(x+b) -1/(x+c)] !
RELATED INFORMATIONS
- 1. Use the solution of the equation to write the quantitative relationship (equivalent relationship) on both sides of a large paper : a 32 page textbook is printed on both sides of a large piece of paper. After folding it five times, the area of each page is 344.875 square centimeters. What is the area of the large paper used to print textbooks? What else can you find when you look at the copyright page of textbooks? Write the quantitative relation (equivalent relation) with the solution of equation
- 2. Ask for a marketing plan book of XXX enterprise, 5000 words urgent! For a marketing plan of XXX enterprise, 5000 words, thank you!
- 3. Mr. Wang wants to print an article. The number of lines and the number of words per line are shown in the following table: the number of words per line; 16 20 25 32 40 50 lines; 100 80 64 50 40 32 It can be seen from the above table that the number of words printed on each line is the same as the number of lines to be printed
- 4. In the extra-curricular books, the sentences describing the actions, expressions, language and psychological appearance are very complex, and the number of words in each aspect is about 15 I'll give you one
- 5. It takes Xiao Li 6 hours and Xiao Wang 5 hours to print a manuscript. Two hours later, there are still 600 words left. How many words are there in this manuscript?
- 6. A manuscript has been typed for 400 words, and there are still four seventh of this manuscript. How many words are there in this manuscript
- 7. For a manuscript, it takes 14 hours for a to type alone and 20 hours for B to type alone The two work alternately. Then when the manuscript is finished, Party A and Party B need to work together___ Hours
- 8. Let's know the cubic power of a = x + the quadratic power of 2x, the cubic power of Y + 2y-1, the cubic power of B = 3 + y + the quadratic power of 2x, the cubic power of Y + 2x and B + C = 2A to find C Given a = x ^ 3 + 2x ^ 3 y + 2Y ^ 3 - 1 b=3+y^3+2x^2 y+2x^3 And B + C = 2A for C
- 9. -101st power of 6 + (- 6) 100th power =? (expressed by power)
- 10. What is the n-th power of a or what is the power of a negative number? What is the even power of a negative number? What is the power of a positive number? What is the power of 0
- 11. What is the volume of three tons of kerosene? (the density of kerosene is equal to 0.8 times 10 to the third power kg / m3)
- 12. The density of kerosene is 0.8 × 10 ᦉ kg / m ᦉ 179;, a bottle can hold 1 kg kerosene, at most__ Kg of water
- 13. A container that can hold 1kg of water can hold 1kg of kerosene and sulfuric acid
- 14. The bottle can hold 0.5kg water, and the maximum can hold 0.8 × 103kg / m3 kerosene______ kg．
- 15. The total mass of a bottle filled with water is 64kg, the total mass of kerosene is 56g, the known bottle mass is 24g, and the kerosene density is calculated
- 16. The measured volume of Apple immersed in water is 1.2 × 10-4 Power M & #, and the buoyancy of apple is calculated? g=10n/kg
- 17. A substance weighs 49n and has a volume of 5x10 to the negative fifth power M & sup3;. When it is put into water, the buoyancy it receives is
- 18. The mass of the wooden ball is 1 / 2 of that of the iron ball, and the radius of the wooden ball is twice that of the iron ball (both balls are solid). How many times is the density of the wooden ball (it's better to talk about the volume ratio)
- 19. The iron ball with the volume of 5DM & # 179; weighs 39.2n. What is the buoyancy of the iron ball after immersion in water? (the density of iron = 7.9 * 10 & # 179; kg / M & # 179;)
- 20. When a hollow copper ball with a mass of 89g is suspended in water, the volume of the hollow part of the copper ball is? And the density of copper is 8.9 × 10 cubic kg / M & sup3;