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A cylindrical container a with a height of 8 cm and a volume of 50 ml is filled with water. Now put a 16 cm long cylinder B vertically so that the bottom of B is in line with a When B is picked up from a, the height of water in a is 6cm, and the volume of cylinder B is calculated
The height of cylinder a is 8 cm. When B is taken out, the height of water becomes 6 cm, that is, three-quarters of the original height, so the volume becomes three-quarters of the original height, that is, the overflow water is one-quarter of the cylinder, which is 12.5 ml. this is the volume of the part B put into cylinder a. the length of B is 16 cm, and only half of it is put into cylinder a, so the volume of cylinder B is 2 × 12.5 = 25 ml
A cuboid glass container, with a bottom area of 250 square centimeters and a height of 12 centimeters, contains 6 centimeters of water
When a stone is put into the water, the water surface rises by 4cm. What is the volume of the stone?
The key to this problem is to understand that the volume of water rising is the volume of stone
Volume of stone = volume of rising water = 250 × 4 = 1000 cubic centimeter
Why is the first layer of the atomic electron cloud 2
The formation of cycle 1 is due to the fact that the k layer can hold up to two electrons. 2,3 is due to the fact that the LM layer can hold up to eight electrons when there are no electrons in 4S. 4,5 is due to the fact that when there are electrons in 4S and 5S respectively, the electrons can enter 3D and 4D, so it takes 18 electrons to enter the outer layer (that is, NS1, which is an alkali metal element) to start a new cycle, The results show that there are 18 elements in the period of 6 s and 7 s. The emergence of lanthanides and actinides is due to the fact that 4f 5F begins to have electrons in the presence of 6S and 7S. Therefore, there are 18 + 14 elements in the period of 6 s (the maximum number of electrons that F can hold) = 32
The 2n2 rule is shown in the table below
The number of layers includes the maximum number of electrons that the orbit can hold
1 S 2
2 S p 2+6=8
3 S p d 2+6+10=18
4 S p d f 2+6+10+14=32
5 S p d f g 2+6+10+14+18=50
6 S P D F G + some 2 + 6 + 10 + 14 + 18 + 22 = 72
7 S P D F G + some 2 + 6 + 10 + 14 + 18 + 22 + 26 = 98
It is observed that if there are more than 112 elements, these elements will also conform to this rule when they constitute the periodic table of elements
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Is acetic acid acetic acid
Yes, they are the same substance. The chemical composition is CH3COOH. It is the component of vinegar in our daily life, but the concentration is relatively thin
When can f – mg = ma be used
When the force F is opposite to the direction of gravity, find out the influence on the object
On the addition, subtraction, multiplication and division of LN. Please master teach, how to calculate?
For example, LN 1 - LN 2; ln 1 + LN 2; ln 1 * LN 2; ln 1 / LN 2
ln 1 - ln 2 = - ln2 = ln(1/2)
ln 1+ ln 2 = ln2
ln 1* ln 2 = 0,ln 1/ ln 2 = 0
Which direction is 10 degrees east longitude at 160 degrees west longitude
What is the longitude difference
East, the longitude difference is 170 degrees
There is a non-zero natural number. If 3 is used to remove less 1, if 5 is used to remove less 3, if 7 is used to remove less 5, what is the minimum natural number?
Because the minimum non-zero natural number is 1, so (x + 1) / 3 = 1, x = 2
(x+3)/5=1 x=2
(x+5)/7=1 x=2
So x = 2, that is to say, the minimum of this natural ripening is 2
Try to judge the number of real number solutions of the equation SiNx = X100 π
The number of real number solutions of the analytic equation SiNx = X100 π is equal to the number of image intersections of the functions y = SiNx and y = X100 π ∵ | SiNx | ≤ 1 | | X100 π | ≤ 1, | x | ≤ 100 π when x ≥ 0, as shown in the right figure, there are 100 intersections of the two lines, because y = SiNx and y = X100 π are odd functions
One hour equals 60 minutes, and 0.6 hours equals 36 minutes, right?
One hour is equal to 60 minutes, and 0.6 hour is equal to 36 minutes, because there are 12 spaces in an hour, not 10 spaces. It can be said that it is in 12 base, that is to say, it doesn't enter 1 until 10, it doesn't enter 1 until 12
If one hour is equal to 60 minutes and 0.6 is equal to 36 minutes, does it mean that one hour is divided into 60 parts and every six parts is 0.1 hours, so 0.6 is 36 minutes and 0.9 is 54 minutes? But have you ever thought that it's time to come? Have you ever seen a clock divided into ten squares
Each grid is also divided into 5 grids, which are 60 base
RELATED INFORMATIONS
- 1. A cuboid glass container with a bottom area of 96 square centimeters and a height of 10 centimeters contains 5 centimeters of water. Now, an iron bead is completely immersed in water In the above, the water level rises by 2 cm. What's the volume of this iron bead? At least a few of these iron beads must be placed before the water overflows the glass container?
- 2. A sealed cuboid glass can, 30cm long, 18cm wide and 12cm high. When it is square, the water depth inside is 9cm. When it is placed on the side, what is the water depth?
- 3. A cuboid glass jar is 40cm in length, 20cm in width and 30cm in height. The water depth is 18cm. Now, an iron ball is completely immersed in the water, and the water surface rises to 25cm to calculate the volume of the iron ball
- 4. A cuboid shaped glass container, 40 cm long, 30 cm wide and 50 cm high, is waterproof and 3 decimeters high. Now there is a piece of iron in it, which is completely immersed in water, and the water level is 35 cm high. How many kg of iron is put in it (7.8 kg of iron per cubic decimeter)
- 5. When a rectangular iron block with a bottom area of 4 square centimeter is put into a glass container with a bottom area of 20 square centimeter, the water in the container rises by 1 centimeter Ask for the height of the iron
- 6. As shown in Figure 1, the water depth in a closed rectangular glass tank is 3 cm. If the glass tank is placed as shown in Figure 2, how many cm is the water depth inside?
- 7. A 40 cm long, 20 cm wide and 30 cm high cuboid glass jar is 18 cm deep. Now an iron ball is completely immersed in the water, and the water surface rises to 25%
- 8. In a 6-decimeter-long, 4-decimeter-wide and 3-decimeter-high rectangular glass jar, the water depth is 2 decimeters, The water depth becomes 2. Find the volume of the iron ball
- 9. There is water in a sealed rectangular glass fiber reinforced plastic. The lengths of the three edges intersecting one vertex of the glass jar are 10 cm, 6 cm and 5 cm respectively. Put the glass jar on the water surface in three different ways. The minimum height of water is 2 cm. What is the maximum height of water? (please draw a sketch and calculate it.)
- 10. Pour 18 liters of water into a rectangular glass tank 4 decimeters long, 3 decimeters wide and 2 decimeters high. How many decimeters is the distance between the water surface and the tank mouth?
- 11. A rectangular tank 30 cm long and 22 cm wide has a water depth of 12 cm. After a stone is placed, the water depth is 19 cm. What is the volume of the stone?
- 12. A 20 cm long, 15 cm wide and 12 cm deep rectangular water tank has a water depth of 6 cm. After a cube stone is put in, the water depth is 10 cm. What is the volume of the stone?
- 13. Pour 1.6 liters of water into two rectangular tanks to make their water level equal. What is the height in centimeters? One rectangle is 12 long and 10 wide, the other rectangle is 8 long and 5 wide,
- 14. Xiaohua read a story book. She read 14 pages on the first day and 20% of the whole book on the second day. At this time, the ratio of the number of pages she has read is 2:3. How many pages does the story book have in total
- 15. (2 of X + 1) (x + 1) (x-1) = necessary process (2a + 1 / 2) (2a-1 / 2) (2 sides of 4A + 1 / 4)= （x+3)(x-3)-2(2-x)(2+x)= (2x+3y)(3x-2y)-(x-2y)(x+2y)= (2-4 of a) (2-5 of a) + (3a + 5) (3a-5)= [(2a-1) (2a + 1) + (a + 2) (A-2) - 4A] (2 of a + 5)=
- 16. The average number of a, B and C is 60. The ratio of a, B and C is 3:2:1. What are the numbers of a, B and C
- 17. There is a batch of cement on the construction site. 40% of the cement is transported in the first time and 35% in the second time. There are 17 tons left. How many tons are there?
- 18. The two passenger and freight cars leave from a and B at the same time. When they meet, the distance ratio of passenger and freight cars is 4:5 After the meeting, the freight car traveled 27 kilometers per hour more than before, and the passenger car still drove at the original speed, and finally arrived at the same time. It is known that the passenger car traveled for 10 hours, and the distance between a and B is calculated Ask to write the process, not too complicated and explain
- 19. The distance between a and B is 360km. A car travels 160km from a to B in four hours. How many hours will it take to reach B?
- 20. Zhuangzhuang and some children went to the fast food restaurant for dinner. They bought 10 hamburgers and French fries, which cost 80 yuan. How many hamburgers and French fries did they buy? You can do it in any way, but don't use the equation with y French fries 5 yuan hamburger 12.5 yuan