1..A message in a bottle is floating on top of the ocean in a periodic manner. The time between periods of maximum heights is 26 seconds, and the average height of the bottle is 12 feet. The bottle moves in a manner such that the distance from the highest and lowest point is 6 feet. A cosine function can model the movement of the message in a bottle in relation to the height.


Part A: Determine the amplitude and period of the function that could model the height of the message in a bottle as a function of time, t. (5 points)


Part B: Assuming that at t = 0 the message in a bottle is at its average height and moves upwards after, what is the equation of the function that could represent the situation? (5 points)


Part C: Based on the graph of the function, after how many seconds will it reach its lowest height? (5 points)


Show/Explain answer for each Part for the answer please

Answers

Answer 1

Answer:

See below for answers and explanations (along with a graph attached)

Step-by-step explanation:

Part A

The amplitude of a sinusoidal function is half the distance between the maximum and the minimum. It is given to us that the distance from the highest and lowest point is 6 feet, so our amplitude is 6/2 = 3 feet

Part B

The graph's function would be in the form of [tex]y=acos(bx+c)+d[/tex] where [tex]a[/tex] is the amplitude, [tex]\frac{2\pi}{b}[/tex] is the period, [tex]-\frac{c}{b}[/tex] is the phase/horizontal shift, and [tex]d[/tex] is the average/midline.

We already know our amplitude of [tex]a=3[/tex] from part A.

Since our period is given to us as 26 seconds, then we can use the equation [tex]\frac{2\pi}{b}=26[/tex] to find [tex]b[/tex], which happens to be [tex]b=\frac{\pi}{13}[/tex].

Since the cosine function starts at its maximum and we want it to start at the average where the bottle travels up, we would need to use the cofunction identity [tex]sin(x)=cos(x-\frac{\pi}{2})[/tex] which shifts the cosine graph [tex]\frac{\pi}{2}[/tex] units to the right. This means that [tex]c=-\frac{\pi}{2}[/tex], making our phase shift [tex]-\frac{c}{b}=-\frac{-\frac{\pi}{2}}{\frac{\pi}{13}}=6.5[/tex], or 6.5 feet to the right

Our average/midline would be [tex]d=12[/tex] as given as the average height by the problem.

Therefore, the function is [tex]f(x)=3cos(\frac{\pi}{13}x-\frac{\pi}{2})+12[/tex]

Part C

Using our determined function from Part B, by looking at its graph, we see that the bottle will reach its lowest height of 9 feet after 19.5 seconds (see attached graph).

1..A Message In A Bottle Is Floating On Top Of The Ocean In A Periodic Manner. The Time Between Periods
Answer 2

Part A

The distance from the highest and lowest point is 6 feet. Cut this in half to find the amplitude: 6/2 = 3. The amplitude represents the vertical distance from the midline (aka average height) to either the peak or valley points.

The period is 26 seconds because this is the time difference from one max height to the next max height. This is one of a few ways to measure a full cycle. Another way is from min height to the next min height.

Answers:Amplitude = 3 feetPeriod = 26 seconds

==========================================================

Part B

In this case, the template for cosine is

h = Acos(B(t-C))+D

We found the amplitude A = 3 from the previous section.

The period is T = 26 which means B = 2pi/T = 2pi/26 = pi/13

D = 12 because the average height is 12 feet. The average height is always on the midline.

We are told that t = 0 leads to h = 12, so,

[tex]h = A\cos\left(B\left(t-C\right)\right)+D\\\\h = 3\cos\left(\frac{\pi}{13}\left(t-C\right)\right)+12\\\\12 = 3\cos\left(\frac{\pi}{13}\left(0-C\right)\right)+12\\\\3\cos\left(\frac{\pi}{13}\left(-C\right)\right) = 0\\\\\cos\left(\frac{\pi}{13}C\right) = 0\\\\[/tex]

Let's isolate the C term

[tex]\cos\left(\frac{\pi}{13}C\right) = 0\\\\\frac{\pi}{13}C = \arccos(0)\\\\\frac{\pi}{13}C = \frac{\pi}{2}\\\\C = \frac{\pi}{2}*\frac{13}{\pi}\\\\C = \frac{13}{2}[/tex]

Answer:  [tex]h = 3\cos\left(\frac{\pi}{13}\left(t-\frac{13}{2}\right)\right)+12\\\\[/tex]

==========================================================

Part C

A full period is 26 seconds.

At t = 0 the bottle is at a height of 12 feet

26 seconds later, the bottle is back again at 12 feet to repeat another cycle indefinitely.

At every quarter cycle, the object is either at a min point, max point, or at the average (midline).

So every 26/4 = 6.5 seconds the object will be in one of those places.

In this case, the object starts at 12 feet, goes up to the max 15 feet when t = 6.5

Then another 6.5 seconds later it's back to the midline again. Another 6.5 seconds later (total time is now 6.5*3 = 19.5 seconds) the bottle dips down to the min height of 9 feet. You should see that (19.5, 9) is one of the infinitely many minimum points on this particular cosine curve.

Answer: 19.5 seconds

Related Questions

please answer I will give brainliest

Answers

The area of the white circle: S₁ = π(1/2B)² = 3.14 × (14 × 1/2)² = 153.86 cm²The area of the big circle: S₂ = 1/2π(1/2A)² = 1/2 × 3.14 × (28 × 1/2)² = 307.72 cm²The area of the blue shaded figure:S = S₂ - S₁ = 307.72 - 153.86 = 153.86  cm²

Answer: 153.86 cm²

Ok done. Thank to me :>

Seven more than three times a number is greater than thirty-four

Answers

Answer:

3x+7>34

Step-by-step explanation:

more than means+and the times means multiple

A car wash detailed 144 cars in 4 hours. At what rate did the car wash detail cars in cars per hour?

Answers

Answer:

If this car wash took 4 hours to detail 144. 144/4 = 1/36 meaning that every hour they would detail 36 cars, we can double-check this and multiply 36 by 4 and we will get 144 meaning that this is true and that this car wash detailed 36 cars in an hour.

The Smiths bought an apartment for $78,000. Assuming that the value of the apartment will increase in value 5% a year, how much will the apartment be worth in 6 years? Answer to the nearest penny.

Answers

The value of the apartment in 6 years is $104,527.46.

What is the future value of the apartment?

The value of the apartment appreciates (increase in value) by 6% every year. The formula that can be used to determine the future value of the apartment is:

FV = P (1 + r)^n

Where:

FV = Future value P = Present value R = interest rate N = number of years

$78,000(1.05)^6 = $104,527.46

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The worth of the apartment after 6 months is =$23,400

Simple interest

The original amount of the apartment(p) = $78,000

The rate of increase of the value of the apartment is(r)= 5%

Time(t) = 6years

But simple interest =

[tex]si = \: \frac{p \times t \times r}{100} [/tex]

[tex]si = \frac{78000 \times 6 \times 5}{100} [/tex]

[tex]si = \frac{2340000}{100} [/tex]

si = $23,400

Therefore, the worth of the apartment after 6 months is =$23,400

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The number of eggs in the refrigerator e decreased by 2 equals 14.

Enter an equation to represent the situation.

Answers

X-2=15

Explanation: X is the number of eggs. When desecrated by 2, it equals 15


order the numbers least to greatest.

Answers

Answer:

21/50 ,43.7%, 87/200,0.44

Step-by-step explanation:

PLEASE, I NEED HELP. QUESTION WORTH 100 POINTS. FIND X

Answers

Answer:

70

Step-by-step explanation:

The angle at the bottom right of the triangle is linear with the 105, so it is 180 - 105 = 75

The top angle of the triangle is an alternate interior angle with the 35 degrees, so it is also 35.

75 + 35 = 110

x = 180 - 110 = 70

The angle above x is 35° as alternate interior angles are equal.

Angle aside right to x

180-10575°

Measure of x

180-(75+35)180-11070°

f(x) = 3x^2 - 9x + 2
What's the axis of symmetry?
What is the coordinate of the vertex?

Answers

axis of symmetry: x=1.5

vertex: (1.5,-4.75)

Look at the triangles shown below.

What is the value of b?
A)6
B)27T3
C)зVT3
D) 3V14

Answers

Answer:

[tex]b=3\sqrt{13}[/tex]

Step-by-step explanation:

Segment Addition Postulate:

[tex]\bar{PY}=\bar{MP}+\bar{MY}[/tex]

Substitute MP = 4, MY = 9 into PY = MP + MY:

[tex]\bar{PY}=4+9[/tex]

Calculate PY = 4 + 9:

[tex]\bar{PY}=13[/tex]

Representing same angles:

[tex]cos A = leg adjacent to <A/hypotenuse:

[tex]cos(Substitute DY = b, PY = 13 into cos (<DYP)=DY/PY:

[tex]cos(Substitute <DYP=<DYM into cos(<DYP)=b/13:

[tex]cos(cos A=leg adjacent to <A/hypotenuse:

[tex]cos\left(Substitute DY=b, MY=9, cos(<DYM)=b/13 into cos (<DYM)=MY/DY:

[tex]\frac{b}{13}=\frac{9}{b}[/tex]

Calculate b/13=9/b:

[tex]b=3\sqrt{13}[/tex]

I hope this helps you :)

8x-2y = 18
y = 4x - 9
Solve by substitution

Answers

x= 3 y= 3
8(3) -2(3)= 18
24 - 6 = 18
y(3) = 4(3) - 9
3 = 12- 9

Answer:

Infinitely many solutions

Step-by-step explanation:

Given system:

8x - 2y = 18y = 4x - 9

Solve by substitution:

8x - 2(4x - 9) = 188x - 8x + 18 = 1818 = 18

We got correct equation without variables.

It means the equation is correct for any value of variables, the lines are same and overlap.

So there are infinitely many solutions.

I need Help ASAP I will give you brainlest and plus 5 stars ✨✨and plus thanks and 50 points EVeryONe need help this is due today so plz help me I need to turn it in today so plz help I will give everything if you do

Answers

Answer:

see step-by-step below

Step-by-step explanation:

1)  y - 2 > 3

Add 2 to both sides:   y > 5

2) y ≤ 2

Draw a closed circle at y = 2 then shade the numbers to the left

3) y ≥ 250

where y = savings

4) The image isn't very clear, so I can't tell if it's a closed or open circle on -4.

If it is closed, it will be y ≤ -4

If it is open, it will be y < -4

5) -4 < f

Draw an open circle at f = -4 then shade the numbers to the right

6) x < -3.5

Draw an open circle at x = -3.5 then shade the numbers to the left

7) closed circle ... shade to the left of 8 ... make y  equal to or less than 8.

8) F ≤ 6

C - closed circle at 6 with shaded numbers to the left

9) y > 2.75

Betty saved more than $2.75 every month

10) 1 + x < 5

Subtract 1 from both sides:  x < 4

11) x ≥ -2.5

12) 1 ≤ m means that m is equal to or greater than 1

solutions:  4, 1, 2.3

Hi can you Answer this plss I really need it ty in advanced!​

Answers

Given:

[tex]X = {0,1,2,3,4} \\ Y = {2,4,6,8,10,12} \\ Z = {3,6,9,12,15}[/tex]

So,

[tex]X∪Y = (0,1,2,3,4) \: ∪ \: (2,4,6,8,10,12) \\ = > (0,1,2,3,4,6,8,10,12)[/tex]

[tex]X∩Z = (0,1,2,3,4) \: ∩ \: (3,6,9,12,15) \\ = > (3)[/tex]

[tex](X∪Y)∩Z = (0,1,2,3,4,6,8,10,13) ∩ (3,6,9,12,15) \\ = > (3,6)[/tex]

Using the generic set operations, we will see that:

1) X U Y = {0, 1, 2, 3, 4, 6, 8, 10, 12}2)  X ∩ Z = {3}3) Z = {3, 6, 9, 12, 15}

How to operate with sets?

For two given sets A and B, we define:

A ∪ B as the union of the two sets, this is the set that contains all the elements from both A and B.

A ∩ B is the intersection of A and B, this set contains only the common elements of A and B.

Now we want to complete the given table:

1) X U Y is the union of sets X and Y (we do not repeat elements) so this is equal to:

{0, 1, 2, 3, 4, 6, 8, 10, 12}

2) X ∩ Z is the intersection of X and Z, the only common element between these sets is 3, then:

X ∩ Z = {3}

3) (X U Y)∩ Z

Is the set of the common elements between:

X U Y = {0, 1, 2, 3, 4, 6, 8, 10, 12}

Z = {3, 6, 9, 12, 15}

The common ones are:

3, 6, and 12, then we have:

(X U Y)∩ Z = {3, 6, 12}

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2) A certain company charges $7.95 per square foot to lay patio. How much would
they charge to lay a 23 foot by 15 foot patio?

Answers

$2742.75

23•15=345sqft
345•7.95=2742.75

I NEED HELP WITH THIS ASAP!!!

Answers

Answer:

a: 42%

b: don't have the info for

c: 48%

d: don't have info for

e: don't have info for

f: don't have info for

Step-by-step explanation:

sorry I cant answer everything

21 A container in the shape of a triangular prism is used to hold a slice of pizza. The dimensions
of the container are shown in the diagram.
10.8 in.
7.2 in.
1.5 in.
PIZZA
9 in.
What is the volume of the container in cubic inches?

Answers

The volume of the triangular prism is 58.32 in³

Volume

Volume is the amount of space occupied by a three dimensional object.

The volume of a triangular prism is given by:

V = Area of triangle * height

Area of triangle = (1/2) * 10.8 * 7.2 = 38.88 in²

Volume of prism = 38.88 * 1.5 = 58.32 in³

The volume of the triangular prism is 58.32 in³

Find out more on Volume at: https://brainly.com/question/1972490

Answer:

58.32in3

Step-by-step explanation:

i did the test

PLEASE HELP ME I NEED TO DO THIS BY TODAY

Answers

Answer is median because aas you can see as the line if divided by its hald angle it equals a median angle.

Simplify.

–(2x – 3y) + 5x + 2 – 3x + 3y + 2
A.
4
B.
4x + 4
C.
6y + 4
D.
4x + 6y + 4

Answers

Answer:

4x + 6y + 4

Step-by-step explanation:

–(2x – 3y) + 5x + 2 – 3x + 3y + 2

= -2x + 3y + 5x + 2 - 3x + 3y + 2

= -2x + 5x -3x + 3y + 3y + 2 + 2

= 0 + 6y + 4

= 6y + 4 (C)

Hope it helps ⚜

Answer:

D; 4x+6y+4

Step-by-step explanation:

1. Distribute the negative

2. -2×+3y+5x+2-3×+3y+2

2. combine like terms

answer; 4x+6y+4

8
5. At the class party, each student will be given a container filled with 8 ounces of juice. There are
25 students in the class. How many ounces of juice does the teacher need to buy?

Answers

Answer:

Since there is 25 students and 8 ounces there you have to do 25 times 8 which equals 200

I WILL GIVE BRAINLIEST PLS HELP

Answers

Answer: distributive property

Step-by-step explanation:

hope it helps u!!

Pls mark me brainliest

James is contemplating an investment opportunity represented by the function A(t)=P(1.06)t, where P is the initial amount of the investment, and t is the time in years. If James invests $5000, what is the average rate of change in dollars per year (rounded to the nearest dollar) between years 15 and 20?

Enter your answer as a number, like this: 42

Answers

Answer:

Rate of change per year = $5300

Step-by-step explanation:

Step 1: Substitute the variable P for the invested amount

    1. A(t) = 5000(1.06)t

    2. A(t) = (5300)t

Step 2: Substitute the variable t for the first 15 years

    1. A(15) = (5300)(15)

    2. A(15) = 79,500

Step 3: Substitute the variable t for the 20 years

    1. A(20) = (5300)(20)

    2. A(20) = 106,000

Step 4: Find your two ordered pairs and relation

    First ordered pair: (15, 79,500)

    Second ordered pair: (20, 106,000)

    Relation: {(15, 79,500), (20, 106,000)}

Step 5: Find the slope or rate of change between 15 and 20 years

    Let (y₁, x₁) = (15, 79,500)

   

    Let (y₂, x₂) = (20, 106,000)

    1. Use the slope expression: y₂ - y₁/x₂ - x₁

    2. Substitute the correct values into the expression:

         106,000 - 79,500/20 - 15

    3. Simplify: 26500/5 = 5300

    4. Hence, the rate of change in dollars per year is $5300

Khan academy
The graph of the invertible function g is shown on the grid below. What is the value of g^− 1 ( 1 )

Answers

By using the graph and the definition of inverse functions, we will see that:

g⁻¹(1) = 4.

What are inverse functions?

We say that two functions f(x) and g(x) are inverse if:

f(g(x)) = xg(f(x)) = x.

Now, we know that graph of g(x) and we want to find the value of:

g⁻¹(1)

In the graph, we can see that:

g(4) = 1

Then we can replace it:

g⁻¹(1) = g⁻¹( g(4) ) = 4.

So we can conclude that:

g⁻¹(1) = 4.

If you want to learn more about inverse functions, you can read:

https://brainly.com/question/12220962

Answer:

-4

Step-by-step explanation:

Khan Academy

More than twenty people came to a sticker exchange. Every person brought the same number of stickers. Every person brought more than one sticker. In all, there were 141 stickers at the exchange. How many people came to the exchange?

Answers

The amount of stickers bought in the sticker exchange is an illustration of factors

There were 47 people in the sticker exchange

How to determine the number of people

The number of stickers is given as:

Stickers = 141

Next, we list the factors of 141 in pairs

(x,y) = (1,141), (3,47), (47,3) and (141,1)

Each person bought more than 1 sticker.

So, we have:

(x,y) = (3,47) and (47,3)

Hence, we can conclude that there were 47 people in the sticker exchange

Read more about factors at:

https://brainly.com/question/219464

Guys can anyone who knows about this explain i will mark brainliest no links. thanks! :)

Answers

Answer:

PS = 7

SQ = 7.125

m<QTR = 115

m<TQR = 32.5

Step-by-step explanation:

To find PS, you need to take the measurement from QR [stated in the problem] which is 7 feet.

To find SQ, you need to take the measurement from RT [stated in the problem as 3 9/16] and then multiply it by 2 as SQ is 2 times longer than RT, which means SQ = 7 1/8 or 7.125 [since it needs to be a decimal]

To find m<QTR, you need to take the measurement from m<RTS, and since those 2 angles together equal 180, you need to subtract 65 degrees [from m<RTS] from 180, resulting in 115 degrees.

To find m<TQR, you need to know that a triangle has 180 degrees within it.  Then you need to find one angle.  We know the wider angle, <T = 115 degrees, so then we have to do 180 - 115, which equals 65 [that is the total for the 2 remaining equal corners], then we just have to divide by 2, which equals 32.5 degrees.

HELP PLEASE

Meredith borrows $12,560 and pays 2 percent simple interest each year for 4 years. What is the total amount of
interest that she will pay on the loan?
$25120
$1,004.80 $
$11,555.20
$13,564.80

Answers

Answer

$1,004.8

Step-by-step explanation:

hope this helps

[tex]~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\\ P=\textit{original amount deposited}\dotfill & \$12560\\ r=rate\to 2\%\to \frac{2}{100}\dotfill &0.02\\ t=years\dotfill &4 \end{cases} \\\\\\ I = (12560)(0.02)(4)\implies I=1004.80[/tex]

Use the number line below to fill in the blank.
3/4


Answers

3/4 = 2/7
The blank is 2/7

What is the greatest common factor of 7, 4, and 39?

Answers

Answer:

1

Step-by-step explanation:

Answer:

1

Step-by-step explanation:

1 is the greatest common factor of 7, 4 and 39

Perimeter of rectangle floor is 80 feet. Find the dimention of the floor if the length is four times the width

Answers

Answer:

width = 8 ft & length = 32 ft.

Step-by-step explanation:

let the width be x and length be 4x.

we know, Perimeter = 2(l+b)

now,

2(4x + x) = 80

10x = 80

x = 80/10 = 8

x = 8

therefore,

width = x = 8 ft

length = 4x = 4 × 8 = 32 ft.

hope this helps you !

Allison measured a line to be 19.4 inches long. If the actual length of the line is 19.1
inches, then what was the percent error of the measurement, to the nearest tenth of a
percent?

PLZ HELP ASAP

Answers

So it would be 19.4-19.1
—————-
19.1

5:8 equal 42:56 true or false

Answers

Answer:

false

Step-by-step explanation:

42 is not divisible by 5

Answer:

False

Step-by-step explanation:

5 does not go into 42

If (-2, 3), (4, -3) and (4, 5) are the mid-points of the sides of a triangle, find the co-ordinates of its centroid​

Answers

Answer:

[tex]G=(2,\frac{5}{3} ).[/tex]

Step-by-step explanation:

Let the given vertices of a triangle be [tex]A(-2,3)[/tex]and [tex]B (4,-3)[/tex] let the third vertex be[tex]C (4,5)[/tex].

Let Centroid be G = [tex][\frac{x_{1} +x_{2}+x_{3} }{3} , \frac{y_{1}+y_{2}+y_{3} }{3} ][/tex]

⇒ [tex]G=(\frac{-2+4+4}{3} ,\frac{3-3+5}{3})[/tex]

⇒ [tex]G=(\frac{6}{3} ,\frac{5}{3} )\\[/tex]

⇒ [tex]G=(2,\frac{5}{3} ).[/tex]

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