Answer:
u need to make a more cleat picture and make it straight please so i can answer
Step-by-step explanation:
If x > 0 and y < 0, where is the point (x, y) located?
A. Quadrant I
B. Quadrant II
C. Quadrant III
D. Quadrant IV
The solution indicates that the point (x,y) is located in the fourth quadrant.
An illustration of the Cartesian system?A horizontal axis known as the x-axis and a vertical axis known as the y-axis are used in the Cartesian coordinate system. The x and y variables will both be present in equations for lines in this system. A line in this system would be, for instance, the equation 2x + y = 2.
What does a math quadrant mean?The x-axis (the horizontally number line) and the y-axis connect to divide the coordinate plane into four equal pieces in the cartesian system (the vertical number line). Due to the fact that each of these four areas takes up one-fourth of the entire coordinate plane, they are referred to as quadrants.
According to the given information:x>0 and y<0 means,
x is positive and y is negative
so, the point (x,y) lies in 4 th quadrant
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if you shift the absolute value parent function, F(x)= IxI, right 9 units, what is the equation of the new function?
A. G(x)=IxI-9
B. G(x)=Ix+9I
C. G(x)=Ix-9I
D. G(x)=IxI+9
What are the coordinates of the center and the length of the radius of the circle
whose equation is-y-12y-20 25-07
a) center (0.5) and radius 7.5
c) center (0-6) and radius 75
b) center (0.12) and radius 45
d) center (-12) and radius 4,5
The equation of the circle, obtained by applying the completing the square method to the specified equation indicates that the center and radius of the circle are;
Center (0, 6) and radius 7.5
What is the general form of the equation of a circle?The general form of the equation of a circle is; (x - h)² + (y - k)² = r², where;
(h, k) = The coordinates of the center of the circle
r = The measure of the length of the radius
The possible equation obtained from a similar question on the internet can be presented as follows;
x² + y² - 12·y - 20.25 = 0
The above equation can be evaluated using the completing the square method and excluding the x² term as follows;
y² - 12·y - 20.25 = 0
y² - 12·y = 20.25
y² - 12·y + (-12/2)² = 20.25 + (-12/2)²
y² - 12·y + (-6)² = 20.25 + (-6)² = 56.25
(y - 6)² = 56.25
Therefore;
y - 6 = √(56.25) = ±7.5
The possible equation of the circle obtained by plugging in the x² term therefore is; (x - 0)² + (y - 6)² = 7.5²
The center of the circle is therefore;
(h, k) = (0, 6)
The radius of the circle, r = 7.5
The possible correction is therefore, option (a), where the 5 is a typing error
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Embáulate the given function for f(8) f(x)=(x-5)2 f(8=
Answer:
f(8) = 9
Step-by-step explanation:
f(x)=(x-5)^2
Let x = 8
f(8)=(8-5)^2
= 3^2
= 9
Radiant Age Berhad acquired 30% of the ordinary shares of Glitter Berhad on 1 January 2022. Radiant Age Berhad holds a substantive option to acquire another 25% of the ordinary shares of Glitter Berhad, but the option can only be exercised in 40 days (12 February 2022). Discuss when Radiant Age Berhad controlled Glitter Berhad. (5 marks)
Control typically arises when an entity has the power to govern the financial and operating policies of another entity to obtain benefits from its activities. In this case, Radiant Age Berhad initially acquired 30% of the ordinary shares of Glitter Berhad on 1 January 2022.
Acquiring 30% of the ordinary shares indicates a significant ownership stake in Glitter Berhad. However, control is not solely determined by the percentage of shares owned. It also depends on the ability to influence the financial and operating policies of the entity.
Given that Radiant Age Berhad holds a substantive option to acquire another 25% of the ordinary shares, it suggests a potential increase in ownership to a total of 55%. However, the option can only be exercised in 40 days, which is on 12 February 2022.
To determine control, we need to evaluate whether Radiant Age Berhad had the ability to govern the financial and operating policies of Glitter Berhad before exercising the option. Factors such as board representation, voting rights, contractual agreements, and the ability to influence key decision-making are crucial in assessing control.
Since the option to acquire the additional 25% of shares can only be exercised after 12 February 2022, Radiant Age Berhad did not have control over Glitter Berhad before that date. Control would only be established if and when the option is exercised, and Radiant Age Berhad obtains the additional shares, bringing their total ownership to 55%.
It's important to note that control is a complex concept, and the specific details of the option agreement and other factors may influence the determination of control. Professional judgment and a detailed analysis of the circumstances would be necessary to arrive at a conclusive assessment of control in this scenario.
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A fifth-degree polynomial equation with rational coefficients has the roots 3, 8i, and 7- radical 5. Which are also roots of the polynomial equation?
Using complex numbers and radicals, it is found that the correct option is C.
When a complex number is a root of a polynomial function, it's conjugate also has to be.
Hence, since 8i is a root of the function, -8i is also a root.The same is valid for radicals, as they are in the \(\pm\) format.
Since \(7 - \sqrt{5}\) is a root, \(7 + \sqrt{5}\) is also a root.Hence, option C is correct.
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Maureen purchased enough carpet to cover a rectangular
The total cost of the carpet is $684.6
How to determine the total costFrom the question, we have the following parameters that can be used in our computation:
Dimension of carpet = 7 meters by 12 meters
Also, we have
Cost per unit square = $8.15
The total amount spent is calculated as
Amount = Cost per unit square * Product of dimensions
Substitute the known values in the above equation, so, we have the following representation
Amount = 8.15 * 7 * 12
Evalyate
Amount = 684.6
HEnce, the total is $684.6
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a subset of outcomes of the sample space is called a(n)
a. event
b. solution set
c. sample set d. probability experiment
The correct answer is (a) event. An event is a subset of outcomes from the sample space. It represents a specific outcome or set of outcomes that we are interested in. Events can be simple, consisting of a single outcome, or they can be compound, consisting of multiple outcomes.
For example, consider rolling a fair six-sided die. The sample space is {1, 2, 3, 4, 5, 6}. Let's say we are interested in the event of rolling an even number. The event in this case would be {2, 4, 6}, which is a subset of the sample space.
Events can also be mutually exclusive, meaning they cannot occur at the same time, or they can be independent, meaning the occurrence of one event does not affect the probability of the other event occurring.
In summary, an event is a subset of outcomes from the sample space and represents a specific outcome or set of outcomes that we are interested in. It is an important concept in probability theory.
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If a car travels 400 miles in 4 hours how fast is it going?
Answer:
100 miles per hour
Step-by-step explanation:
Answer:
100 miles in 1 hour
Step-by-step explanation:
all you have to do is divied 400 and 4
Question 1
n+ 19 = 40
What does n equal?
Answer:
Hey there!
n+19=40
-19=-19
n=21
Let me know if this helps :)
Answer:
\( \boxed{ \bold{ \huge{ \boxed{ \sf{ n = 21}}}}}\)
Step-by-step explanation:
\( \sf{n + 19 = 40}\)
Move 19 to right hand side and change it's sign
⇒\( \sf{n = 40 - 19}\)
Subtract 19 from 40
⇒\( \sf{n = 21}\)
Hope I helped!
Best regards!!
HELPPP PLEASE
Also I used line A as a place holder I don’t know if it’s right
Answer:
Line A is the right answer.
Answer:
a is right linear means straight line
Step-by-step explanation:
Which numbers can be divided by 6 with no remainder? Select all that apply. 114 8 18 204 106 221
Answer:
They are: 114, 18, 204.
if an inequality contains the less than symbol or greater than symbol its graph would be a ___ line.
If an inequality contains the less than symbol (<) or greater than symbol (>), its graph would be a dotted or dashed line.
This is because these symbols indicate that the boundary line is not included in the solution set. For example, the inequality x > 3 would have a dotted line at x = 3, indicating that 3 is not included in the solution set. On the other hand, if the inequality contains the less than or equal to symbol (≤) or greater than or equal to symbol (≥), its graph would be a solid line.
This is because these symbols indicate that the boundary line is included in the solution set. For example, the inequality y ≤ 2 would have a solid line at y = 2, indicating that 2 is included in the solution set.
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Match the correlation to the statement:
I cannot be confident at all.
I can be a little confident; my prediction could be close or way off.
I can be somewhat confident; my predicted value could be close but not exact.
I can be certain that my predicted value will be exact.
-1 -0.645 0 0.347
Also If someone doesnt mind can you please explain this??? I dont understand at all lol.
The correct matching relating the correlation coefficients are given as follows:
0: I cannot be confident at all.0.347: I can be a little confident; my prediction could be close or way off.0.645: I can be somewhat confident; my predicted value could be close but not exact.-1: I can be certain that my predicted value will be exact.What is a correlation coefficient?A correlation coefficient is an index that measures the association between multiple variables.
The closer the absolute value of the correlation coefficient is of 1, the stronger is the association, meaning that the statement has more certainity.
Closer to zero, the correlation coefficient gives no confidence of the assessment, and values above 0.6 are considered as indicating strong correlation.
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What is monomial representations and symmetric presentations?
Answer: A monomial representation is a way to express a polynomial as a product of powers of its variables, where each power is a non-negative integer. For example, the polynomial 2x^3 + 4x^2 - 6x + 8 can be represented as a monomial representation of (2x^3)(x^2)(-6x)(8).
Symmetric polynomials are polynomials that are invariant under permutation of their variables. A symmetric presentation is a way of expressing a symmetric polynomial as a sum of elementary symmetric polynomials, which are defined as the sum of all possible products of variables taken i at a time, where i ranges from 1 to the number of variables. For example, the symmetric polynomial x^3 + y^3 + z^3 can be expressed as a symmetric presentation of x + y + z.
Step-by-step explanation:
Jorge needs to reflect a figure across the line y = negative 4. Which statements are correct regarding steps he could take to complete the reflection? Check all that apply.
The correct statements regarding the steps Jorge could take to complete the reflection are:
1) Jorge should graph in the vertical line with values of -4 for the line of reflection.
2) Jorge could count how far each pre-image point is from the line of reflection along the perpendicular from the point to the line of reflection.
3) Jorge could count how far each vertex of the figure is from the y-axis and count the same distance on the other side.
4) Jorge will not move any point that lies on the line of reflection.
5) Jorge could check his work by seeing if each segment joining a pre-image point with its image has the midpoint on the line of reflection.
6) Jorge could check his work by making sure that the image has the same orientation as the original.
To complete the reflection of a figure across the line y = -4, Jorge can take the following steps:
1) Jorge should graph the vertical line y = -4 as the line of reflection. This line represents the axis of reflection, and all points on this line will remain fixed in their positions after the reflection.
2) Jorge could count how far each pre-image point is from the line of reflection along the perpendicular from the point to the line of reflection. This will help him determine the distance and direction each point should move to reflect across the line.
3) Jorge could count how far each vertex of the figure is from the y-axis and count the same distance on the other side. Since the line of reflection is y = -4, which is parallel to the y-axis, he can use the distance from the vertex to the y-axis as a guide to placing the reflected point on the other side of the line.
4) Jorge will not move any point that lies on the line of reflection. Points on the line of reflection will remain fixed in their positions as they are symmetric to themselves across the line.
5) Jorge could check his work by seeing if each segment joining a pre-image point with its image has the midpoint on the line of reflection. In a reflection, the midpoint of each line segment connecting a point and its reflection will lie on the line of reflection. Checking this property helps ensure the accuracy of the reflection.
6) Jorge could check his work by making sure that the image has the same orientation as the original. The orientation refers to the arrangement or direction of the figure's components (e.g., angles, lengths, shapes). If the image retains the same orientation as the original, it indicates a correct reflection.
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Question
Jorge needs to reflect a figure across the line y = negative 4. Which statements are correct regarding steps he could take to complete the reflection? Check all that apply.
1) Jorge should graph in the vertical line with values of –4 for the line of reflection.
2) Jorge could count how far each pre-image point is from the line of reflection along the perpendicular from the point to the line of reflection.
3) Jorge could count how far each vertex of the figure is from the y-axis and count the same distance on the other side.
4) Jorge will not move any point that lies on the line of reflection.
5) Jorge could check his work by seeing if each segment joining a pre-image point with its image has the midpoint on the line of reflection.
6) Jorge could check his work by making sure that the image has the same orientation as the original.
Write an expression to represent:
Nine less than the quotient of two and a number z.
Answer:
2 / z - 9
Step-by-step explanation:
Don't worry division always goes before subtraction so you don't need any parenthesis.
Tell me if I'm wrong :)
Find the value of
\(\\ \rm\Rrightarrow {6+log_{\frac{3}{2}}\left(\dfrac{1}{3\sqrt{2}}\sqrt{4-\dfrac{1}{3\sqrt{2}}\sqrt{4-\dfrac{1}{3\sqrt{2}}\sqrt{4-\dfrac{1}{3\sqrt{2}}\dots}}}\right)}\)
Options are
\(\sf \circ -4\)
\(\sf \circ 1\)
\(\sf \circ 4\)
\(\sf \circ 2\)
Note:-
Kindly don't answer wrong if you don't know .
Spams/copied from web/short/wrong/irrelevant answers will be deleted on the spot .
Answer:
4
Step-by-step explanation:
Given,
\(6+log\frac{3}{2} (\frac{1}{3\sqrt{2} } \sqrt{4-\frac{1}{3\sqrt{2} }\sqrt{4-\frac{1}{3\sqrt{2} } ...} }\)
Let,
\(x= \sqrt{4-\frac{1}{3\sqrt{2} }\sqrt{4-\frac{1}{3\sqrt{2} }\\\)
By this we get
\(x=\sqrt{4-\frac{1}{3\sqrt{2} }(x) } }\)
On squaring both sides,
\(x^{2} =4-\frac{1}{3\sqrt{2} }(x) } }\\\\x^{2} -4+\frac{x}{3\sqrt{2} } =0\\\\3\sqrt{2} x^{2} -12\sqrt{2} +x=0\\\\x=\frac{-1+\sqrt{1-(-12\sqrt{2})*(3\sqrt{2})*4 } }{2*3\sqrt{2} } \\\\x=\frac{-1+\sqrt{289} }{6\sqrt{2} } \\\\x=\frac{-1+17}{6\sqrt{2} } \\\\x=\frac{8}{3\sqrt{2} }\)
Now,
\(6+log\frac{3}{2} [\frac{1}{3\sqrt{2} } *\frac{8}{3\sqrt{2} } ]+log\frac{3}{2} *[\frac{8}{9*2} ]\\\\6+log\frac{3}{2}(\frac{4}{9} )\\\\6-log\frac{3}{2}(\frac{9}{4} )\\\\6-log\frac{3}{2} (\frac{3}{2})^2 \\\\6-2=4\)
\(\sqrt{4 - \dfrac1{3\sqrt2} \sqrt{4 - \dfrac1{3\sqrt2} \sqrt{4 - \dfrac1{3\sqrt2} \sqrt{\cdots}}}}\)
Starting from the identity
\((x - y)^2 = x^2 - 2xy + y^2\)
take the positive square root on both sides.
\(x - y = \sqrt{x^2 - 2xy + y^2}\)
Note that we must have \(x\ge y\). Rewrite the radicand and substitute \(x-y\).
\(x - y = \sqrt{x^2 - xy - y (x - y)} \\\\ ~~~~ = \sqrt{x^2 - xy - y \sqrt{x^2 - xy - y (x - y)}} \\\\ ~~~~ = \sqrt{x^2 - xy - y \sqrt{x^2 - xy - y \sqrt{x^2 - xy - y (x - y)}}} \\\\ ~~~~ \vdots \\\\ ~~~~ = \sqrt{x^2 - xy - y \sqrt{x^2 - xy - y \sqrt{x^2 - xy - y \sqrt{\cdots}}}}\)
Let \(y=\frac1{3\sqrt2}\). Solve for \(x\).
\(x^2 - \dfrac x{3\sqrt2} = 4 \\\\ x^2 - \dfrac x{3\sqrt2} + \dfrac1{72} = \dfrac{289}{72} \\\\ \left(x - \dfrac1{6\sqrt2}\right)^2 = \dfrac{289}{72} \\\\ x - \dfrac1{6\sqrt2} = \pm \dfrac{17}{6\sqrt2} \\\\ x = \dfrac{18}{6\sqrt2} \text{ or } x = -\dfrac{16}{6\sqrt2} \\\\ x = \dfrac3{\sqrt2} \text{ or } x = -\dfrac8{3\sqrt2}\)
Take the positive solution to ensure \(x>y\). Then the infinitely nested root expression in the logarithm converges to
\(x - y = \dfrac3{\sqrt2} - \dfrac1{3\sqrt2} = \dfrac{4\sqrt2}3\)
and the overall expression has a value of
\(6 + \log_{\frac32} \left(\dfrac1{3\sqrt2} \times \dfrac{4\sqrt2}3\right) = 6 + \log_{\frac32} \left(\dfrac49\right) \\\\ ~~~~ = 6 + \log_{\frac32} \left(\dfrac23\right)^2 \\\\ ~~~~ = 6 - 2 \log_{\frac32} \left(\dfrac32\right) \\\\ ~~~~ = 6 - 2 = \boxed{4}\)
a car is travellling at 60 km/hr on a road such that the coefficient of friction between its tire and road is 0.8. find the minimum turning radius of the car
A car is travelling at 60 km/hr on a road such that the coefficient of friction between its tire and road is 0.8. We need to find the minimum turning radius of the car.
In order to find out the minimum turning radius of the car, we can use the formula mentioned below: \[\text{Turning radius }= \frac{{V^2}}{{g\mu }}\]
Where, V = Velocity of car, μ = coefficient of friction, g = acceleration due to gravity
Putting the given values in the above formula, we get:\[\text{Turning radius }= \frac{{{{\left( {\frac{{60 \times 1000}}{{60 \times 60}}} \right)}^2}}}{{9.8 \times 0.8}} = 625 m\]
Therefore, the minimum turning radius of the car is 625 meters, approximately.
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As an estimation we are told 5 miles is 8 km.
Convert 84 km to miles.
Answer:
52.5 miles
Step-by-step explanation:
5 miles = 8 km
→ Find how many miles in 1 km
8 km = 5 miles
1 km = 0.625 miles
→ Multiply both sides by 84
84 km = 52.5 miles
i hope this work for you
and sory if im wrang
The ponderal indexis a measure of the "leanness" of a person. A person who is h inches tall and weighs w pounds has a ponderal index I given by I = a. Compule the ponderal index for a person who is 76 inches tall and weighs 192 pounds: Round to the nearest hundredth. b. What is a man's weight if he is 77 inches tall and has a ponderal index of 11.56 ? Round to the nearest whole number. a. The ponderal index for a person who is 76 inches tall and weighs 192 pounds is (Round to the nearest hundredth as needed.)
The ponderal index cannot be computed without the value of the constant "a" in the formula. Therefore, the ponderal index for a person who is 76 inches tall and weighs 192 pounds cannot be determined.
To compute the ponderal index, we need the formula and the value of the constant "a."
a) The formula for the ponderal index is given as I = a, where I represents the ponderal index and a is a constant. However, the value of the constant "a" is missing in the provided information. Without knowing the value of "a," we cannot compute the ponderal index for a person who is 76 inches tall and weighs 192 pounds.
b) Similarly, without knowing the value of the constant "a," we cannot determine the weight of a man who is 77 inches tall and has a ponderal index of 11.56.
To compute the ponderal index or determine the weight, we need the specific value of the constant "a" in the given formula.
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Find the area of the given triangles.
Answer: 1125
Step-by-step explanation:
Can somebody plz help me with surveys in math?
Enter the correct answer in the box.
Simplify the expression
Answer:
guy above me is wrigth. If you have any doubts see the picture.
Step-by-step explanation:
Hope it helps and mark as brailiest pleasee
Use Newton's method to find an approximate solution of ln(x)=9−x. Start with x0=10 and find x2. x2 =____ (Do not round until the final answer. Then round to six decimal places as needed.)
x2 ≈ 17.969712 is the approximate solution of ln(x) = 9 - x using Newton's method with x0 = 10.
To obtain an approximate solution of ln(x) = 9 - x using Newton's method, we start with an initial guess x0 = 10 and iterate until convergence.
The formula for Newton's method is:
x_(n+1) = x_n - f(x_n) / f'(x_n)
First, let's obtain the derivative of f(x) = ln(x) - 9 + x.
The derivative of ln(x) is 1/x, so:
f'(x) = 1/x - 1
Now, we can plug the values into the Newton's method formula to obtain x2:
x1 = x0 - (f(x0) / f'(x0))
= 10 - ((ln(10) - 9 + 10) / (1/10 - 1))
= 10 - ((ln(10) + 1) / (-9/10))
≈ 10 - (2.30259 + 1) / (-0.9)
≈ 10 - 3.30259 / (-0.9)
≈ 10 + 3.669544 / 0.9
≈ 10 + 4.077271
≈ 14.077271
Now, using x1 as the new approximation, we repeat the process:
x2 = x1 - (f(x1) / f'(x1))
= 14.077271 - ((ln(14.077271) - 9 + 14.077271) / (1/14.077271 - 1))
≈ 14.077271 - ((2.64748 + 1) / (-0.93644))
≈ 14.077271 - (3.64748 / -0.93644)
≈ 14.077271 + 3.892441
≈ 17.969712
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Find the area of the surface obtained by rotating the curve y=1+5x2 from x=0 to x=2 about the y -axis. computed using the method of disks or washers via an integral
The surface area obtained by rotating about the y -axis is 168.159.
What is Integration?In mathematics, integration is a technique for combining or adding the parts to arrive at the total. It is a form of differentiation in reverse where we break down functions into their component elements. This technique is employed to determine the summation on a sizable scale.
We have the function y=1+5x² from x=0 to x=2 about the y -axis.
So, the Surface are is
S = 2π ∫ R(x) √ (1+ f'(x)²}
Then, f'(x) = 10x
Then, S = 2π ∫ R(x) √ (1+ f'(x)²}
= 2π ∫ (1+5x²) √ (1+100x²)
= 1/150 (401 (√401-1)) π
= 168.159
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Given: tangent A = negative StartRoot 15 EndRoot What is the value of Tangent (A minus StartFraction pi over 4 EndFraction)?
Answer:
( √15 + 8)/7
Step-by-step explanation:
TanA = -√15
.we are to find tan(A-π/4).
In trigonometry
Tan(A-B) = TanA - TanB/1+ tanAtanB
Hence:
tan(A-π/4) = TanA - Tanπ/4/1+ tanAtanπ/4
Substitute tan A value into the formula
tan(A-π/4) = -√15-tanπ/4 / 1+(-√15)(tanπ/4
tan(A-π/4) = -√15-1/1-√15
Rationalize
-√15-1/1-√15 × 1+√15/1+√15
= -√15-√225-1-√15/(1-√225)
= -2√15-15-1/1-15
= -2√15 -16/(-14)
= -2(√15+8)/-14
= √15 + 8/7
Hence the required value is ( √15 + 8)/7
Answer:
Probably D ( -√15-1/1-√15)
Step-by-step explanation:
it was in adidemiokin's answer before they rationalized it. Couldn't find the darn answer anywhere else. I'm on my 3rd attempt on the EDGE precalc Unit test hopefully D is right.
If the two figures are congruent, which statement is true?
A. BCDA ≅ FEHG
B. ABCD ≅ EFGH
C. BADC ≅ EFGH
D. ADCB ≅ HGFE
Answer:
A
Step-by-step explanation:
the order of letter should resemble the same shape
PPPLLLLZZZZZZZ help need this done quick and corrrectly
Part A.
Can you map shape I onto shape II by a sequence of rotations, translations, reflections, or dilations? If so, give a sequence that maps shape I onto shape II.
Part B.Can shape I be mapped onto shape III by a sequence of rotations, translations, reflections, or dilations? If so, give a sequence that maps shape I onto shape III.
Part C.Can shape I be mapped onto shape IV by a sequence of rotations, translations, reflections, or dilations? If so, give a sequence that maps shape I onto shape IV. please answer all parts
Answer:
Part A: rotate 90° counter clockwise
left 2 up 2
Part B: Dilation. 8 units down and 8 units left
Part C: Dilating shape I by a scale factor of 2, then reflecting it across the x-axis, and translating it 1 unit left will map shape I onto shape IV.
Step-by-step explanation:
1. In a radical engine the moving parts have a total moment of inertia of 1 kg m 2
, and this is concentrated in the plane of the single crankpin. The engine is directly connected to an air-screw of moment of inertia 18 kg m 2
, by a hollow shaft having outer and inner diameters of 80 mm, and 35 mm, and a single effective length of 0.30 m. The stiffness of the crank-throw alone is 2.5×10 4
Nm/rad. Estimate the natural frequency of torsional vibration of the custen What percentage is involved if the air-screw mass is assumed to be infinite. G=83000 N/mm 2
HINT The stiffness of the crank-throw may be reduced to an equivalent length of shaft at the same diameter as the engine using q
1
= q 1
1
+ q 2
1
The percentage change in frequency is 0%.Hence, the natural frequency of torsional vibration of the custen is given by f = 25.7 / L₀^(1/2) and the percentage change in frequency is 0%.
We are given that:
Total moment of inertia of moving parts = I = 1 kgm²
Moment of inertia of air-screw = I = 18 kgm²
Outer diameter of hollow shaft = D₀ = 80 mm
Inner diameter of hollow shaft = Dᵢ = 35 mm
Length of hollow shaft = L = 0.30 m
Stiffness of the crank-throw = K = 2.5 × 10⁴ Nm/rad
Shear modulus of elasticity = G = 83000 N/mm²
We need to calculate the natural frequency of torsional vibration of the custen.
The formula for natural frequency of torsional vibration is: f = (1/2π) [(K/L) (J/GD)]^(1/2)
Where, J = Polar moment of inertia
J = (π/32) (D₀⁴ - Dᵢ⁴)
The formula for equivalent length of hollow shaft is given by:
q₁ = q₁₁ + q₁₂
Where, q₁₁ = (π/32) (D₀⁴ - Dᵢ⁴) / L₁q₁₂ = (π/64) (D₀⁴ - Dᵢ⁴) / L₂
L₁ = length of outer diameter
L₂ = length of inner diameter
For the given shaft, L₁ + L₂ = L
Let L₁ = L₀D₀ = D = 80 mm
Dᵢ = d = 35 mm
So, L₂ = L - L₁= 0.3 - L₀...(1)
For the given crank-throw, q₁ = (π/32) (D⁴ - d⁴) / L, where D = 80 mm and d = 80 mm
Hence, q₁ = (π/32) (80⁴ - 35⁴) / L
Therefore, q₁ = (π/32) (80⁴ - 35⁴) / L₀...(2)
From the formula for natural frequency of torsional vibration, f = (1/2π) [(K/L) (J/GD)]^(1/2)
Substituting the values of K, J, G, D and L from above, f = (1/2π) [(2.5 × 10⁴ Nm/rad) / (L₀) ((π/32) (80⁴ - 35⁴) / (83000 N/mm² (80 mm)³))]^(1/2)f = (1/2π) [(2.5 × 10⁴ Nm/rad) / (L₀) (18.12)]^(1/2)f = 25.7 / L₀^(1/2)...(3)
Now, if we assume that the air-screw mass is infinite, then the moment of inertia of the air-screw is infinite.
Therefore, the formula for natural frequency of torsional vibration in this case is:
f = (1/2π) [(K/L) (J/GD)]^(1/2)Substituting I = ∞ in the above formula, we get:
f = (1/2π) [(K/L) (J/GD + J/∞)]^(1/2)f = (1/2π) [(K/L) (J/GD)]^(1/2)f = 25.7 / L₀^(1/2)
So, in this case also the frequency is the same.
Therefore, the percentage change in frequency is 0%.Hence, the natural frequency of torsional vibration of the custen is given by f = 25.7 / L₀^(1/2) and the percentage change in frequency is 0%.
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