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A road team built a road, 186 meters in total in the first six days. At this speed, it took nine days to finish. How long is the road? To use the solution proportion solution, list the relationship, such as X * y = K
Let this road be x meters long
According to a certain work efficiency, the total amount of work and working hours are listed in a positive proportion
x：（6＋9）＝186：6
6x＝（6＋9）×186
6x＝2790
x＝465
Find the eighth grade volume II physics on the density of pressure strength of a variety of super difficult problems, there are many~
If you can [email protected] Better have an answer~
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Two identical springs with neglected mass are connected with an object with mass m in the middle and placed vertically, as shown in the figure. The length of the upper spring is L1 = 5cm, and the length of the lower spring is L2 = 3.5cm. Now, slowly raise the upper end of the upper spring for a distance D and stop. At this time, the supporting force of the lower spring to the object, etc
How to calculate the slope of 1:2
For example, if the height is 1 and the width is 2, the slope is 1:2
Volume II density of matter
In "exploring the relationship between the mass and volume of an object", the physical quantities to be measured are as follows_____ 、_____ The experimental instruments used to measure these physical quantities are_____ 、______ .
Mass, volume
Scales, meters,
What is the slope of 1:0.1 or 1:0.2?
The slope is equal to the tangent of the slope and the result is 1:0.1
How many mols of chlorine are consumed when 1 mol ethylene is completely added (reacted) with chlorine and then completely replaced with chlorine?
I know it's 5mol, but after I write out the reaction equation, I get the answer: 3.5mol.4c2h4cl2 + 10cl2 --- c2h3cl3 + c2h2ci4 + c2hcl5 + C2Cl6 + 10cl2 1mol -- 2.5mol 2.5 + 1 = 3.5
C2H4+Cl2→C2H4Cl2
C2H4Cl2+4Cl2→C2Cl6+4HCl
C2H4～(1+4)Cl2～5Cl2
The total consumption of chlorine is 5mol
How to calculate the slope gradient of 1:1.5?
Slope of 1:1.5 refers to the ratio of slope height and transverse width of 1:1.5
Slope calculation depends on subgrade design specifications
1 mol methane reacts with 1 mol chlorine to form several moles
Why is the substitution reaction between 1 mol methane and 1 mol chlorine under light conditions, if the amount of four substances is the same, then the amount of each substance is 0.25 mol?
Understand the generation of 2.5mol of hydrogen chloride, the same as the consumption of 2.5mol of chlorine?
The one on the second floor is not very clear, and it's a substitution reaction, not an addition reaction, between methane and chlorine. The carbon atom of methane is single bond
How do you look like there is something wrong with this question? I've seen this question before. It seems that Cl2 doesn't say 1mol, does it?
If it's not 1mol, I'll solve the problem correctly
If so, I'll do it again
Product: CH3Cl, CH2Cl2, CHCl3, CCl4, etc. according to the conservation of C, there is always 1mol of C in methane
Divide into four parts, each 0.25mol
Pay attention to the principle of substitution reaction: a Cl in a Cl2 molecule is substituted into the organic molecule, and a Cl combines with the substituted h to form HCl, with the ratio of 1:1:1
0.25 mol CH3Cl and 0.25 mol CL were substituted to form 0.25 mol HCl
0.25mol CH2Cl2 and 0.5mol CL were substituted to form 0.5mol HCl
0.75 mol CL was substituted by 0.25 mol CHCl3 to form 0.75 mol HCl
0.25 mol CCl4 was substituted by 1 mol CL to produce 1 mol HCl
The total amount of HCl was 2.5mol
Which is steeper, 1:1.5 or 1:2.0
Slope ratio is the tangent value of slope angle. The larger the value is, the steeper the slope is
How many moles of electrons are transferred by 1 mol of chlorine?
The above formula is reversible reaction
Should it be 2mol?
If 1mol chlorine is added to the reaction, 2mol electrons will be transferred
RELATED INFORMATIONS
- 1. It took 50 seconds for the train to cross a 1140 meter long bridge and 80 seconds for the train to cross a 1980 meter long tunnel
- 2. It took 50 seconds for a train to cross a 1230 meter long bridge and 70 seconds to cross a 1830 meter long tunnel at the same speed To solve the equation Find the length again
- 3. How many kilometers is it from one place to another? Is it the straight-line distance between the two places or the length of the highway route?
- 4. An engineering team built a 1200 meter long highway, which took 8 days to build 4 / 15 of the total length. According to this calculation, how many days will it take to complete the highway
- 5. An engineering team has built a highway, which is 1200 meters long. At this time, the ratio of the length of the highway to that of the highway is 3:10, What's the length of this highway?
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- 8. Taian Wuyue Special Purpose Vehicle Co., Ltd. is a large-scale production base of special purpose vehicle. In the vehicle type test, a special purpose vehicle of this factory runs 5.6km on a straight road evenly, and the resistance is 30000N, which consumes fuel
- 9. In the model test of a special vehicle of junior high school physics, it drove at a constant speed of 80km / h for 6km on a straight road, consuming 1.5L of fuel, In the model test, a special purpose vehicle runs at a constant speed of 80km / h on a straight road for 6km. The fuel consumption is 1.5L. It is known that the density of gasoline is 0.7 * 10 cubic kg / M cubic, and the calorific value of gasoline is 4.5 * 10 seventh power J / kg. Assuming that the fuel is completely burned and the efficiency of gasoline engine is 40%, how much resistance does the vehicle receive in the process of driving at this speed
- 10. It is known that a domestic car consumes 8 liters of gasoline for every 100 km. What is the mass of gasoline consumed by the car for 100 km
- 11. After six days of building a highway, it is more than 120 meters above the midpoint, and the rest will continue to be built at the original speed. It can be completed in five days. How long is the highway?
- 12. A highway subgrade is 100km long and 50m wide. How many square kilometers and hectares does the highway subgrade cover? No wrong number
- 13. The subgrade of a highway is 100 kilometers long and 50 meters wide. How many hectares and square kilometers does the subgrade cover
- 14. In our country, the maximum speed limit is 120km / h. someone is supposed to drive along the straight road at the highest speed, The acceleration of the car when braking is 5m / S2, and the driver's reaction time (from the time when he realizes to stop to operate the brake) is 0.6-0.7s?
- 15. How to calculate the area of highway subgrade cross section? For example: 3.10m subgrade width left: 10.75 right: 10.75 slope 1:1, what's the excavation area
- 16. (2 / 2) m, width of road
- 17. What is the appropriate width of sidewalks for all levels of urban roads
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