Exam 5: Key Concept- the Definite Integral

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If f(x)=x2+4f(x)=\frac{x}{2}+4 and g(x)= x + 1, how do 812f(x)dx\int_{8}^{12} f(x) d x and 812g(x)dx\int_{8}^{12} g(x) d x compare?

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The average value of a function g on 0 \le x \le 2 is a constant gˉ\bar{g} given by gˉ=12002g(d)dx\bar{g}=\frac{1}{2-0} \int_{0}^{2} g(d) d x .Also, 02(g(x)gˉ)2dx0\int_{0}^{2}(g(x)-\bar{g})^{2} d x \geq 0 , since (g(x)gˉ)2(g(x)-\bar{g})^{2} is a square.Which of the following must be true?

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The figure below shows the graph of the velocity, v, of an object (in meters/sec.).If the graph were shifted up two units, what would it mean for the motion of the object? The figure below shows the graph of the velocity, v, of an object (in meters/sec.).If the graph were shifted up two units, what would it mean for the motion of the object?

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At time t, in seconds, the velocity, v, in miles per hour, of a car is given by v(t)=8+0.8t2v(t)=8+0 .8 t^{2} for 0t80 \leq t \leq 8 .Use Δ\Delta t = 2 to estimate the distance traveled during this time.Give the right-hand sum.

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How can the quantity f(a)h be represented in the picture? How can the quantity f(a)h be represented in the picture?

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The velocity of an object is given by v(t)v(t) , and the acceleration is given by a(t)a(t) .What is the relationship between the total change in v(t)over the interval 0 \le t \le 10 and a(t)?

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Does the quantity  Does the quantity      \int_{a}^{a+h} f(x) d x  represent a length or an area in the picture?    Does the quantity      \int_{a}^{a+h} f(x) d x  represent a length or an area in the picture?   aa+hf(x)dx\int_{a}^{a+h} f(x) d x represent a length or an area in the picture?  Does the quantity      \int_{a}^{a+h} f(x) d x  represent a length or an area in the picture?

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Consider a sports car which accelerates from 0 ft/sec to 88 ft/sec in 5 seconds (88 ft/sec = 60mph).The car's velocity is given in the table below. t 0 1 2 3 4 5 V(t) 0 30 52 68 80 88 In which time interval is the average acceleration smallest?

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Below is the graph of the velocity, in feet per second, of a hat that is thrown up in the air from ground level.Positive velocity means upward motion. [Note that this is the graph of velocity, not distance.] Below is the graph of the velocity, in feet per second, of a hat that is thrown up in the air from ground level.Positive velocity means upward motion. [Note that this is the graph of velocity, not distance.]   About how big is the average speed over the first 4 seconds? About how big is the average speed over the first 4 seconds?

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What is the value of acf(x)dx\int_{a}^{c} f(x) d x if the area of A = 15 and the area of B = -4?  What is the value of  \int_{a}^{c} f(x) d x  if the area of A = 15 and the area of B = -4?

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Consider a sports car which accelerates from 0 ft/sec to 88 ft/sec in 5 seconds (88 ft/sec = 60mph).The car's velocity is given in the table below. t 0 1 2 3 4 5 V(t) 0 31 53 69 81 88 Find the lower bound for the distance the car travels in 5 seconds.

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Two greyhound racing dogs, A and B, start at the same time and travel in the same direction along a straight track.The figure below gives the velocity, v, of each dog as a function of time t.Which dog travels the farthest? Two greyhound racing dogs, A and B, start at the same time and travel in the same direction along a straight track.The figure below gives the velocity, v, of each dog as a function of time t.Which dog travels the farthest?

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Suppose abg(x)dx=7\int_{a}^{b} g(x) d x=7 , ab(g(x))2dx=8\int_{a}^{b}(g(x))^{2} d x=8 , abh(x)dx=1\int_{a}^{b} h(x) d x=1 , and ab(h(x))2dx=4\int_{a}^{b}(h(x))^{2} d x=4 .Find abg(x)dx(ab(2h(x))dx)2\int_{a}^{b} g(x) d x-\left(\int_{a}^{b}(2 h(x)) d x\right)^{2} .

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Explain in words what 26v(t)dt\int_{2}^{6} v(t) d t means if v(t)v(t) is velocity in miles/hour and t is time, in hours.

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If 05f(x)dx=11\int_{0}^{5} f(x) d x=11 and 510f(x)dx=16\int_{5}^{10} f(x) d x=16 , what is 010f(x)dx\int_{0}^{10} f(x) d x ?

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What is the value of aax7dx\int_{-a}^{a} x^{7} d x ?

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Using the following figure, calculate the value of the right-hand Riemann sum f on the interval 0 \le t \le 12 with Δ\Delta t = 6.  Using the following figure, calculate the value of the right-hand Riemann sum f on the interval 0  \le  t  \le  12 with  \Delta t = 6.

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Suppose A = the area under the curve y=ex2y=e^{-x^{2}} over the interval -5 \le x \le 5.Which of the following is/are true?

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A potato is cooking in an oven.Explain in words what 1350035F(t)dt300\frac{1}{35-0} \int_{0}^{35} F(t) d t \approx 300 means if F(t)F(t) is the temperature of the potato, in degrees Farenheit, and t is time, in minutes.

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Suppose f(t)is given by the graph below.If F(x)=0xf(t)dtF(x)=\int_{0}^{x} f(t) d t , what is F(4)F(4) ?  Suppose f(t)is given by the graph below.If  F(x)=\int_{0}^{x} f(t) d t  , what is  F(4)  ?

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