微积分I(标准路径) · 免费预览

§4.4 The Fundamental Theorem of Calculus (continued)

如何在不取黎曼和的极限的情况下求出定积分的精确值?

1. Summary

Summary

2. Average of a piecewise function

A piecewise function ff on [0,5][0,5] is built from three parabolic or linear pieces, and direct computation of the pieces gives ∫05f(x) dx=52\int_0^5 f(x)\,dx = \frac{5}{2}. Its average value on [0,5][0,5] is

3. Climbing time from a reciprocal table

An aircraft's climb rate table gives c(h)c(h) in feet per minute. To estimate total time to climb to 1000010000 feet, the right move is to

4. Two averages that must agree

For an object with position ss and velocity v=s′v = s', the average velocity s(b)−s(a)b−a\frac{s(b)-s(a)}{b-a} and the average value of vv on [a,b][a,b] satisfy

5. Boosting a distance by a constant

An object's velocity on [12,24][12,24] integrates to 150150 meters. If velocity is increased everywhere by a constant cc, the value of cc making the distance traveled on [12,24][12,24] equal 210210 meters is

6. Peak acceleration from a velocity graph

On 0<t<40 \lt t \lt 4 the velocity obeys v(t)=−14t3+32t2+1v(t) = -\frac{1}{4}t^3 + \frac{3}{2}t^2 + 1, so a(t)=−34t2+3ta(t) = -\frac{3}{4}t^2 + 3t, and on 12<t<1612 \lt t \lt 16 the velocity is linear with slope 32\frac{3}{2}. The greatest acceleration is

7. Average value from an integral

For the piecewise function with average value 12\frac{1}{2} on [0,5][0,5], compute ∫05f(x) dx\int_0^5 f(x)\,dx as a decimal.

8. Average velocity on a late window

For the object with velocity graph on [0,24][0,24] minutes, the accumulated displacement on [12,24][12,24] is 150150 meters. Compute the average velocity on that window.

9. Exact distance over the curved stretch

With v(t)=−14t3+32t2+1v(t) = -\frac{1}{4}t^3 + \frac{3}{2}t^2 + 1 on [0,4][0,4] and antiderivative −116t4+12t3+t-\frac{1}{16}t^4 + \frac{1}{2}t^3 + t, compute the exact distance traveled in meters.

10. Antiderivative of reciprocal on the negative side

For x<0x \lt 0, the function ln⁡(−x)\ln(-x) is a valid antiderivative of 1x\frac{1}{x}.

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