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A cuboid container, measured from the inside, has a bottom area of 200 square centimeters and a height of 30 centimeters. Pour 1 liter of water into the container to measure the depth of water______ Cm
1 liter = 1 cubic decimeter = 1000 cubic centimeter, 1000 △ 200 = 5 (CM), answer: the water depth in the container is 5 cm
A cuboid container, measured from the inside, has a bottom area of 400 square centimeters and a height of 20 centimeters. Pour 1 liter of water into the container, with a depth of () cm?
1 liter of water = 1000 cubic centimeters
The bottom area is 400 square centimeters
Then 1 liter of water is poured into the container, and the water depth is 1000 △ 400 = 2.5 cm
A rectangular container with a bottom area of 200 square centimeters is 8 centimeters high and contains 4 centimeters of water. Now a stone is placed in a container (the stone is completely immersed)
A rectangular container with a bottom area of 200 square centimeters is 8 centimeters high, and there is 4 centimeters of water in it. Now put a stone into a container (the stone is completely immersed in water), and the water surface rises by 2 centimeters. How about the volume of the stone?
Is it possible to calculate the volume of the stone? If it is, there is one less condition in LZ, that is, the water surface rises by 2cm,
The answer is very simple: 200 * 2 = 400 (CM & # 179;)
I also hope LZ will complete the questions next time
Several computer problems
In the following statements about utilities, the error is_______________ .
A. The utility program completes some tasks related to the management of computer system resources and files
B. Some of the utilities are used to deal with various problems in the process of computer operation
C. Some of the utilities are designed to make it easier and more convenient for users to use the computer
D. The user program is independent of the operating system
In word, the following statement about the operation of tables is incorrect_______________ .
A. The text can be converted into a table
B. The table can be converted to text
C. The text and table can be converted to each other
D. The text and table cannot be converted to each other
3. In powerpoint2002, there are several ways to display views_______________ .
A. General, slide show, outline
B. General, slide show, slide show
C. General, slide show, outline
D. Slide view, slide show, outline
At present, in_______________ With the rapid development of information technology, the process of world informatization is speeding up
A．\x05Internet
B．\x05Nowell
C．\x05Windows NT
D．\x05ISDN
c d a a
If two identical "220 V & nbsp; 100 W" electric lamps are connected in series and then connected in 220 V circuit, the total electric power of the two lamps is ()
A. 200 WB. 100 WC. 50 WD. 25 W
When the voltage at both ends of a bulb is 220 V, the power is 100 W, that is, P = u2r = 100 W, ∵ the specifications of the two bulbs are the same, ∵ the resistance of the two bulbs are R, ∵ the total resistance in the series circuit is equal to the sum of the partial resistance, and the voltage of the power supply remains unchanged, ∵ when the two bulbs are connected in series in the 220 V circuit, the total electric power of the two lamps: P total = u2r + r = u22 r = 12, P = 12 × 100 W = 50 W
It can be easily calculated by dividing 11 / 15 + (2 / 3-3 / 5) by 1 / 4
11 / 15 + (2 / 3-3 / 5) divided by 1 / 4
=11/15+(10/15-1/15)x4
=11/15+4/15
=1
If the potential difference between a and B is 1 V, and an electron moves from a to B, the work done by the electron to overcome the electric field force is 1 eV, then ()
A. The electric potential energy of the electron increases by 1 eV D and the kinetic energy of the electron increases by 1 eV
A. The electric potential of a is higher than that of B, and the electric field strength has nothing to do with the electric potential, but the electric field strength does not necessarily point from a to B, and it is impossible for B to point to A. therefore, AB is all wrong. C. if the work done by the electron to overcome the electric field force is 1eV, then the electric potential energy of the electron increases 1eV. Therefore, C is correct. D. if the work done by the electron to overcome the electric field force is 1eV, according to the kinetic energy theorem, the kinetic energy decreases 1eV Error. So select C
Calculation (9915-16) × 8
(99 15\16)×8
=(100-1/16)×8
=800-½
=799.5
How many kilowatts of heat is a cubic meter of gas?
1 cubic meter of natural gas (2.1 yuan) heat = 10 degrees of electricity (5.5 yuan) heat. If a family uses 200 liters of hot water every day, we can see the cost
The water inlet temperature is 10 ℃ and heated to 45 ℃
The specific heat of water = 1 liter of water to 1 degree requires 1 kcal of heat
The heat required to heat 200 liters of water from 10 ℃ to 45 ℃ is
200 liters * 1 kcal / L * = 7000 kcal
The thermal efficiency of gas water heater is 85%
The minimum heat value of 〈 1 〉 1 cubic meter liquefied gas is 21000 kcal
The highest value is 28000 kcal and 25900 kcal in Jiangsu and Zhejiang
200 liters of water from 10 degrees to 45 degrees, the required liquefied gas is
7000 kcal / < 25900 kcal * 85% > is equal to 0.32 cubic meters
The cost of 1 cubic meter of liquefied gas is 9 yuan 5 yuan
It costs three yuan to heat 200 liters of water from 10 to 45 degrees
The minimum heat value of 〈 2 〉 1 cubic meter natural gas is 7100 kcal
The highest value is 12000 kcal, and the highest value is 9000 kcal in Jiangsu and Zhejiang
The amount of natural gas required to heat 200 liters of water from 10 ℃ to 45 ℃ is
7000 kcal / 9000 kcal * 85% is equal to 0.9 cubic meters
One cubic meter of natural gas costs 2 yuan 4 yuan
The cost of heating 200 liters of water from 10 ℃ to 45 ℃ is 2 yuan and 2 yuan
The thermal efficiency of electric water heater is 80%
The heat of 1 kwh is 860.42 kcal
200 liters of water is heated from 10 to 45 degrees. The electricity required is
7000 kcal / < 860.42 kcal * 80% > is equal to 10.2 degrees
5 cents per kilowatt hour
The cost of heating 200 liters of water from 10 to 45 degrees is $5.6
{x + y = 420,30% x + 40% y = 160 × 80% to solve the equation
x+y=420 (1)
30%x+40%y=160×80% (2)
The simplified formula (2) is as follows
3x+4y=1280 (3)
(1) 4 - (3)
x=400
Substituting (1), the solution is y = 20
By testing, x = 400, y = 20 are the solutions of the equations
Therefore, the solution of the equations is:
x=400
y=20
RELATED INFORMATIONS
- 1. A cuboid container, measured from the inside, has a bottom area of 200 square centimeters and a height of 30 centimeters. Pour 1 liter of water into the container to measure the depth of water______ Cm
- 2. A 150 cubic centimeter iron block is completely immersed in a cylindrical container containing water. The diameter of its bottom is 10 cm. How much has the water surface risen People's education sixth grade matching exercise book page 12
- 3. A cylindrical container with a bottom radius of 5cm is filled with water. Immerse a 157 cubic centimeter iron block in water. When the iron block is taken out, how many centimeters does the water surface drop?
- 4. If a 150 cubic centimeter iron block is completely immersed in a cylindrical container with water, and the bottom diameter of the cylindrical container is 10 cm, then Process to calculate What's the height of the rise of the water? (the number obtained keeps the whole number)
- 5. The cube container with the edge length of 6 decimeters is filled with water. Pour all the water in the container into a cuboid water tank. The water tank measures 6 decimeters long, 5 decimeters wide and 8.5 decimeters high from inside. At this time, what is the depth of water poured into the water tank? How many liters of water should I fill the tank?
- 6. (unit: cm) there is 1 long 15 wide 10 cuboid container with water. Put 4 eggs in it. The water rises by 2. There is a formula for calculating the volume of eggs. Thank you
- 7. The volume of an egg is measured with a cylindrical glass container and a conical glass container. It is known that there is the same amount of water in the two containers, and the area of the bottom of the cylinder The bottom radius of the cone container is 10 cm and the height is 20 cm. The water in the cone glass container is 12 cm high. Put the egg in the cone container and immerse it completely. The water level rises by 6 cm. Then put the egg in the cylinder container and immerse it completely. How many cm does the water rise?
- 8. The diameter of the bottom surface of a cylindrical container is 10 cm. After putting a piece of iron into the container, the water surface rises by 2 cm. The volume of this piece of iron is () cubic cm A. 157B. 628C. 125.6D. 78.5
- 9. A cuboid container with a bottom area of 15 square decimeters contains 3 decimeters of water. After an irregular stone is put into the container (the stone is completely immersed in the water, and the water surface rises by 2 cm). How many cubic decimeters is the volume of the stone?
- 10. A cuboid container, with a bottom area of 4 square decimeters and a height of 10 cm, contains 5 cm high water. Now, a stone is immersed in the water and the water level rises I hope it can be finished today (10.7). It's urgent
- 11. Now there is an empty cuboid container a and a cuboid container B filled with water 24 cm deep. Pour part of the water in container B to a (supplement, bottom) Now there is an empty cuboid container a and a cuboid container B with 24 cm deep water. We need to pour part of the water in container B to container a, so that the water in the two containers is the same height. At this time, how many cm deep is container a? Urgent, want to segment formula, hope to have enthusiastic netizens to help (Note: container a is 40cm long, 20cm high and 30cm wide. Container B is 30cm long, 24cm high and 20cm wide.)
- 12. A cuboid glass jar, measuring from the inside, 50 cm long, 40 cm wide and 20 cm high. Now pour 1 liter of water into the glass jar, and the water depth is 100 cm______ Cm
- 13. There is a cuboid glass container. The container measures 40cm long, 30cm wide and 35cm high from the inside. He injects some water into the container until the water depth is 10cm. Finally, he puts a cube iron block with 20cm edge length into the water and finds that the top of the iron block is still higher than the water surface. So, what is the water depth at this time?
- 14. It is known that the volume of a spherical iron block is measured by a rectangular container with a side length of 8 cm and a height of 16 cm It is known that a rectangular container with a side length of 8 cm on its bottom and a height of 16 cm is used to measure the thickness of the container Measure the volume of a spherical iron block. The water in the container is 2 cm away from the mouth of the cup In the container, some water overflows. When the iron block is taken out, the water surface drops by 5cm Product
- 15. A cuboid with a square bottom is 8 cm high. If its height is increased by 1 / 3, its surface area will be increased by 24 square cm（ emergency
- 16. A horizontal cuboid with a side length of 8 cm and a height of 3.5 cm is on the bottom. What is the surface area and volume of the cuboid?
- 17. The bottom of a cuboid is a square. Unfold the side of the cuboid and it is a square with side length of 8 cm. Calculate the volume of the cuboid
- 18. The volume of a cuboid is 192 square centimeters, the bottom is a square with side length of 8 centimeters, and the surface area of the cuboid is ()
- 19. Make a 5cm deep uncovered rectangular iron box with a 40cm long and 20cm wide rectangular iron sheet. What is the maximum volume of this iron box
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