3 years ago

How do you do this???????

Mathematics

1 answer:

pychu [463]3 years ago

5 0

The answer to the question is A

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A fluid moves through a tube of length 1 meter and radius r=0.006±0.00025 meters under a pressure p=4⋅105±2000 pascals, at a rat

iris [78.8K]

Answer:

Maximum error for viscosity is 17.14%

Step-by-step explanation:

We know that everything is changing with respect to the time, "r" is changing with respect to the time, and also "p" just "v" will not change with the time according to the information given, so we can find the implicit derivative with respect to the time, and since

$n = (\frac{\pi}{8}) (\frac{pr^4}{v})\\$

The implicit derivative with respect to the time would be

$\frac{dn}{dt} = \frac{\pi}{8} ( \frac{r^4}{v} \frac{dp}{dt} + \frac{4pr^3}{v}\frac{dr}{dt} )$

If we multiply everything by dt we get

$dn = \frac{\pi}{8} ( \frac{r^4}{v} dp + \frac{4pr^3}{v} dr})$

Remember that the error is given by $\frac{dn}{n}$ therefore doing some algebra we get that

$\frac{dn}{n} = 4 \frac{dr}{r} + \frac{dp}{p}$

Since, r = 0.006 , dr = 0.00025 , p = 4*105 , dp = 2000 we get that

$\frac{dn}{n} = 0.1714$

Which means that the maximum error for viscosity is 17.14%.

5 0

3 years ago

Roberto tool a test that contained 25 questions. He received an 88% on the test. how many questions did he answer correctly?

iren [92.7K]

He got 22/25 questions right because

if you put X as the number of questions he got right out of 25 and equal it to 88 out of 100 you can cross multiply to get X

x/25=88/100
100x=25×88

25×88=2200
100x=2200

divide 100 on both sides
therefore
2200/100= 22

hope this helps

8 0

3 years ago

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Emily is going to the movies this weekend with some friends. they have a total of $54 to spend. Emily wants a large popcorn that

timurjin [86]

Answer is 7

You have to do

54 - 12= 42

Then divide 42 by 6 which equals 7

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3 years ago

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Find the surface area of a box measuring 4 inches long 3 inches wide and 6 inches tall

Rufina [12.5K]

4*3