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Law Incorporation [45]
3 years ago
12

A fireman's water hose shoots 320 kg of water each second against the door of a building. The velocity of the water is 20 m/s an

d the water strikes the door horizontally and doesnt bounce back. What average force is exerted by the stream of water?
Mathematics
1 answer:
NeX [460]3 years ago
3 0

Answer:

6400\ \text{N}

Step-by-step explanation:

\dfrac{m}{t} = Mass flow rate of water = 320 kg/s

m = Mass of water on the door

t = Time

v = Velocity of water on the door = 20 m/s

Force is given by

F=\dfrac{m}{t}v\\\Rightarrow F=320\times 20\\\Rightarrow F=6400\ \text{N}

The average force is exerted by the stream of water is 6400\ \text{N}.

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dedylja [7]

Answer:

For 25, the answer is C

Step-by-step explanation:

How I got the answer for 25 is:

To find the mean absolute deviation of the data, start by finding the mean of the data set.

How you do this is first you need to find the sum of the data values, (add all the numbers together) and divide the sum by the number of data values.(and divide that number by how many numbers you added together in the first place)

In this case, we'd be adding 44 + 39 + 47 + 38 + 38 + 41 + 40, and that equals 287. Now we'll divide 287 by how many numbers we added together, which is 7 numbers. 287 ÷ 7 = 41. That's the mean of the data set.

Next, we'll find the absolute deviation of the mean. How we do this is, we find how far away all the numbers are from 41.

44 is 3 away from 41

39 is 2 away from 41

47 is 6 away from 41

38 is 3 away from 41

41 is 0 away from 41

40 is 1 away from 41

So now, we add all of the distances together (3, 2, 6, 3, 0, and 1), and that equals 15! Now we do 15 ÷ 6, which is 2.5 and the reason we're dividing by 6 is because we're dividing by the number of distances we added together. Now, if you look on your worksheet, the closest answer to 2.5 is C, (2.6) so I'd chose that as the correct answer. I hope that helped!

4 0
3 years ago
Please help will give brainliest
Ronch [10]

Answer:

A+B=180°(linear pair)

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a=180°-52°

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6 0
3 years ago
A jet plane can carry up to 200,000 liters of fuel. It used 130,000 liters of fuel during a flight. What percentage of the fuel
Leto [7]

Answer:

Step-by-step explanation:

65%

Step-by-step explanation:

Given: Full capacity= 200000 litres

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Now, finding percentage of fuel used on the flight.

∴ Percentage of fuel used=  

Solving it, we will get  

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4 0
2 years ago
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Tcecarenko [31]

Answer:

Stan has 13 pencils.

Step-by-step explanation:

s+5=18

  -5 -5

   s=13

Hope this helps! ;)

<em>(plz mark me as brainliest?)</em>

<em>(u don't have to)</em>

8 0
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vampirchik [111]

Answer:

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Step-by-step explanation:

please like and Mark as brainliest

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