Question

решите задачи Электронасос выкачивает из колодца 30 л. воды за 12 с. а)За какое время наполнится водой 800-литровая бочка?А 1000-литровая бочка?б)Сколько воды выкачает насос за 10 с. ?A за 18 с.?А за 2 мин.?пажалуйста

Answer 1

30л-12сек

800л-хсек

800 х12/30=320сек

1000х12/30=400 сек

30л-12с

хл-10с

30х10/12=25л

30х18/12=45л

30лх120/12=300л

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer 2

Problem Analysis

We are given that an electric pump can pump 30 liters of water from a well in 12 seconds. We need to determine the following:

a) The time it takes to fill an 800-liter barrel and a 1000-liter barrel. b) The amount of water pumped by the pump in 10 seconds, 18 seconds, and 2 minutes.

Problem Solution

a) To find the time it takes to fill the barrels, we can set up a proportion using the pump's pumping rate:

Pumping rate = Volume / Time

Let's calculate the time it takes to fill the 800-liter barrel:

30 liters / 12 seconds = 800 liters / x seconds

Cross-multiplying, we get:

30 * x = 12 * 800

Simplifying, we find:

x = (12 * 800) / 30

Now, let's calculate the time it takes to fill the 1000-liter barrel:

30 liters / 12 seconds = 1000 liters / y seconds

Cross-multiplying, we get:

30 * y = 12 * 1000

Simplifying, we find:

y = (12 * 1000) / 30

b) To find the amount of water pumped by the pump in different time intervals, we can use the same proportion:

30 liters / 12 seconds = Volume / Time

Let's calculate the amount of water pumped in 10 seconds:

30 liters / 12 seconds = Volume / 10 seconds

Cross-multiplying, we get:

30 * 10 = 12 * Volume

Simplifying, we find:

Volume = (30 * 10) / 12

Now, let's calculate the amount of water pumped in 18 seconds:

30 liters / 12 seconds = Volume / 18 seconds

Cross-multiplying, we get:

30 * 18 = 12 * Volume

Simplifying, we find:

Volume = (30 * 18) / 12

Finally, let's calculate the amount of water pumped in 2 minutes:

30 liters / 12 seconds = Volume / 2 minutes

Since 1 minute is equal to 60 seconds, we have:

30 liters / 12 seconds = Volume / (2 * 60 seconds)

Cross-multiplying, we get:

30 * (2 * 60) = 12 * Volume

Simplifying, we find:

Volume = (30 * 2 * 60) / 12

Now, let's calculate the values.

Calculation

a) Time to fill the 800-liter barrel: x = (12 * 800) / 30 = 320 seconds

Time to fill the 1000-liter barrel: y = (12 * 1000) / 30 = 400 seconds

b) Amount of water pumped in different time intervals: Amount of water pumped in 10 seconds: Volume = (30 * 10) / 12 = 25 liters

Amount of water pumped in 18 seconds: Volume = (30 * 18) / 12 = 45 liters

Amount of water pumped in 2 minutes: Volume = (30 * 2 * 60) / 12 = 300 liters

Answer

a) The 800-liter barrel will be filled in 320 seconds, and the 1000-liter barrel will be filled in 400 seconds. b) The pump will pump 25 liters of water in 10 seconds, 45 liters in 18 seconds, and 300 liters in 2 minutes.