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Lake Lanier in Georgia, USA, is a reservoir creat…

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Problem 69 Medium Difficulty

The graph of the acceleration $ a(t) $ of a car measured in $ ft/s^2 $ is shown. Use the Midpoint Rule to estimate the increase in the velocity of the car during the six-second time interval.


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Frank Lin

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Amrita Bhasin

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Calculus 1 / AB

Calculus: Early Transcendentals

Chapter 5

Integrals

Section 4

Indefinite Integrals and the Net Change Theorem

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Integration

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Problem 1
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Problem 7
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Problem 9
Problem 10
Problem 11
Problem 12
Problem 13
Problem 14
Problem 15
Problem 16
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Problem 18
Problem 19
Problem 20
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Problem 22
Problem 23
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Problem 25
Problem 26
Problem 27
Problem 28
Problem 29
Problem 30
Problem 31
Problem 32
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Problem 34
Problem 35
Problem 36
Problem 37
Problem 38
Problem 39
Problem 40
Problem 41
Problem 42
Problem 43
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Problem 45
Problem 46
Problem 47
Problem 48
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Problem 50
Problem 51
Problem 52
Problem 53
Problem 54
Problem 55
Problem 56
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Problem 74

Video Transcript

Okay, let's go ahead and do the calculation in this problem. We're asked to basically find the area under the curve. Okay? Using the midpoint rule. Now, the points are not given to you exactly. And we don't know what the exact function is. So the best that we can do here is to use our eyes to estimate the values. So each individual, what may have a slightly different opinion on what the values are, so the answer is could differ a little bit, but I'll do my best in order to help you solve these kind of problems. No, What I did was split the bottom into equal parts so that the bottom with is equal to one. And of course, the more, Uh um rectangles that you will have, the better the estimation is going to be. I used 66 rectangles simply because it was easy. Mhm. Now the first hike from 0 to 1. It's insignificant. When you plug in the height at 0.5, it's nearly close to zero. I know that it's going to be positive, but I will just use zero. Okay, I indicated zero plus just to keep in mind that it's not exactly zero. Okay, the next height, I am going to use the height at 1.5, which in my eyes looked like it was the height of two. So because the base length is, one area of this rectangle is going to be a two. Similarly, the next point at 2.5, the height to me looked like it was a seven. The next point I used looked like it was the height of 12. Similarly, because it's symmetric, the next point also looked like it ended up being 12. Keeping chart is 345 and when I plug in 5.5, the height seemed like it was around six, and that exhaust all of the rectangles that I have. So the area under the curve using the midpoint rule in my eyes it looked like it was going to be zero plus two plus seven plus 12 times two and a six, so that number adds up to 39. So if your answer is somewhere between I would say 38 to 41 then that is totally acceptable. In my opinion, I think the calculation is probably going to be an underestimate. So it's more likely that you will get 40 or 41 if you'd used more rectangles. Okay. And that is how you answer this question.

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Video Thumbnail

40:35

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In mathematics, integration is one of the two main operations of calculus, with its inverse operation, differentiation, being the other. Given a function of a real variable (often called "the integrand"), an antiderivative is a function whose derivative is the given function. The area under a real-valued function of a real variable is the integral of the function, provided it is defined on a closed interval around a given point. It is a basic result of calculus that an antiderivative always exists, and is equal to the original function evaluated at the upper limit of integration.

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