![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
In physics, the ratio of the distance an object passes through to the time it takes is called the ratio of the motion of an object_____ It means how fast an object moves in the process
speed
In physics, we describe the speed of an object's movement by "how much distance an object passes through in unit time". In literary works, we often use some idioms to describe the speed of an object's movement. In the following idioms, the most similar way to describe the speed of movement in physics is ()
A. A long way to go
The idioms in these four options are used to describe the speed of an object's movement. Among them, the three idioms "arrow away from the string", "one day a thousand miles" and "the wind blows like lightning" describe the speed of an object's movement, while "late arrival" describes the speed of an object's movement
In daily life, there are two ways to compare the speed of objects: one is to compare time with the same distance; the other is to compare distance with the same time
If we use another way to express it, its unit will become -?
It compares the speed of an object according to the method of comparing the distance at the same time. If it is expressed in another way, its unit will become (M / s) (i.e. s / M)
When the output exceeds 3.5 million yuan, the bonus will be 800 yuan. When the actual sales increase by 100000 yuan, the bonus base will increase by 400 yuan?
=IF(AND(A1>=3500000,A13500000,(INT((A1-3500000)/100000))*400+800,0))
What are the formulas of pursuit problem
Basic concept: the problem of travel studies the motion of an object. It studies the relationship among speed, time and travel
Basic formula: distance = speed × time; distance △ time = speed; distance △ speed = time
Key problem: determine the position during the journey
Encounter problem: speed and X encounter time = encounter distance (please write other formulas)
Encounter problem (straight line): distance of a + distance of B = total distance
Encounter problem (ring): A's distance + B's distance = ring circumference
Pursuit problem: pursuit time = distance difference △ speed difference (write other formulas)
Pursuit problem (straight line): distance difference = distance between pursuer and pursuee = speed difference x pursuit time
Pursuit problem (ring): fast distance - slow distance = circumference of curve
Flow problem: downstream stroke = (ship speed + water speed) × downstream time, upstream stroke = (ship speed water speed) × upstream time
Forward speed = ship speed + water speed, backward speed = ship speed - water speed
Hydrostatic velocity = (downstream velocity + upstream velocity) × 2 water velocity = (downstream velocity - upstream velocity) × 2
Flow problem: the key is to determine the speed of the object, refer to the above formula
Bridge problem: the key is to determine the distance of the object, refer to the above formula
Flow problem = flow velocity + flow velocity △ 2 flow velocity = flow velocity - flow velocity △ 2
What is the formula of pursuit problem?
most urgent!
After someone buys goods in a shop, he rides a bicycle at a speed of 5 m / s along the straight transportation speed. Five minutes later, the owner finds that the customer has forgotten the goods, so he drives a motorcycle to catch up with the customer. If the speed of the motorcycle is 54 km / h, when can the motorcycle catch up with the customer? How far away from the store?
After 5 minutes (300 seconds), the distance between the owner and the customer is: 5 * 300 = 1500 (meters)
Motorcycle speed: 54 km / h = 15 m / S
The time required for the shopkeeper to catch up with the customer: 1500 / (15-5) = 150 (seconds)
When the shopkeeper catches up with the customer, the distance from the store is 150 * 15 = 2250 (m)
Car a starts to move in a straight line with uniform acceleration from standstill with an acceleration of 3m / S2, and car B starts to move in a straight line with uniform acceleration with an acceleration of 4m / S2 at the same place with an acceleration of 2S later. The two cars move in the same direction. Before car B overtakes car a, the maximum distance between the two cars is ()
A. 18mB. 23.5mC. 24mD. 28m
When the speed of two vehicles is the same, the distance is the largest, that is, a a a t a = a b t B, because t a = t B + 2, t b = 6 s, the maximum distance between two vehicles is, △ x = x a - x B = 12a a t a 2 - 12a b t B 2 = 24 M
It takes 10 hours for Party A and Party B to complete a project together. After working together for 4 hours, Party A leaves for some reason, and Party B completes the whole project in 18 hours. If Party A and Party B do this project separately, how many hours will it take?
Work efficiency of Party B: (1-110 × 4) △ 18, = (1-25) △ 18, = 35 △ 18, = 130, work efficiency of Party A: 110-130 = 115, work alone time of Party A: 1 △ 115 = 15 (hours), work alone time of Party B: 1 △ 130 = 30 (hours), answer: work alone time of Party A: 15 hours, work alone time of Party B: 30 hours
Workload (Mathematics)=--------*---------*--------
It's a formula
(Mathematics) workload = number of staff * per capita productivity * working hours
1. For a job, it takes 15 days for Party A to do it alone, and 12 days for Party B to do it alone. If Party A and Party B cooperate, and Party B takes 6 days off at work, how many days will it take to complete it? 2. There are several tons of coal. The original coal consumption is 3T per day. After 15t is used, the equipment is improved, and the daily coal consumption is half of the original. As a result, the original coal consumption is obtained after 10 days of burning
Question 1: the answer must be greater than or equal to 6, so even if two people work for six days at the same time, the workload:
Party B's work efficiency is 1 / 12, which can complete half of the total amount
A's work efficiency is 1 / 15, which can complete 2 / 5 of the total amount
If 1 / 2 + 2 / 5 = 7 / 10 and 3 / 10 of the total is left, M / 12 + m / 15 = 3 / 10 can be solved in M days, then M = 2
So it's going to take eight days
The second problem: suppose that the original total is n tons, then 15 / 3 + (N-15) / 1.5-n / 3 = 10, and N = 45 (tons)
RELATED INFORMATIONS
- 1. If the time and distance of two objects are not the same, what is used to express the speed of motion in physics
- 2. Speed is a physical quantity that describes the speed and direction of an object, Why do some exercises only write "describe how fast an object moves" without mentioning direction
- 3. In English
- 4. All the formulas of physical acceleration are those for time and velocity
- 5. The average speed is a rough description of how fast an object moving at variable speeds moves at -- or
- 6. If the average speed of an object moving in a variable speed straight line is 6m / s in the first half of the distance and 10m / s in the second half of the distance, the average speed in the whole distance is () A. 7.04m/sB. 7.50m/sC. 8m/sD. 8.24m/s
- 7. From the formula of uniform linear motion v = s / T, it can be seen that the velocity is equal to the ratio of displacement to time, which has nothing to do with velocity and displacement. Why is it wrong
- 8. Velocity displacement formula
- 9. According to the velocity formula v = s / T, what is correct in the following statement? A. The speed of an object is proportional to its distance B. The speed of an object is inversely proportional to time C. The speed of an object is directly proportional to its distance and inversely proportional to its time D. The speed of the object is constant and has nothing to do with the distance time reason
- 10. How to find the surface area and volume of a cube or cuboid
- 11. What do the English letters K, l, h and N on the architectural drawings mean?
- 12. In high school physics, the average speed is the displacement divided by time. Then, there are several time periods in the whole process where the displacement is different from the time used. At this time, what is the average speed of the whole process,
- 13. What is the difference between instantaneous velocity and average velocity
- 14. The solution of physical velocity in the first grade of high school After the train starts, it leaves the station for a uniform acceleration and straight-line movement. When people at the front end of the first carriage see the second carriage passing him for 5 seconds, how long does the sixth carriage pass him? Detailed process... First floor 1: √ 2-1: √ 3 - √ 2: Where did you come from? Can you explain it in detail
- 15. What's the image of uniform velocity linear motion
- 16. The formula of velocity is v = △ X / △ T. is v the average velocity or the velocity? What's the difference between the average velocity and the velocity
- 17. In senior high school physics compulsory one, there is an experiment of uniform linear motion, which requires the instantaneous velocity of a point on the paper tape. I know it needs to be estimated when measuring the displacement. But what about the velocity obtained by dividing the displacement by time? What about the acceleration? If the difference between the two displacements is just an integer? Do you want to add. 000 after the velocity
- 18. Is the speed of sound in the air average or instantaneous? Is the speed from Shanghai to Suzhou average or instantaneous?
- 19. Specific physical meaning
- 20. Speed is an object_____ A physical quantity, which is numerically equal to the position of the object_____ .