# 1.5 Conic sections  (Page 10/23)

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For the following exercises, determine the equation of the parabola using the information given.

Focus $\left(4,0\right)$ and directrix $x=-4$

${y}^{2}=16x$

Focus $\left(0,-3\right)$ and directrix $y=3$

Focus $\left(0,0.5\right)$ and directrix $y=-0.5$

${x}^{2}=2y$

Focus $\left(2,\phantom{\rule{0.2em}{0ex}}3\right)$ and directrix $x=-2$

Focus $\left(0,2\right)$ and directrix $y=4$

${x}^{2}=-4\left(y-3\right)$

Focus $\left(-1,4\right)$ and directrix $x=5$

Focus $\left(-3,5\right)$ and directrix $y=1$

${\left(x+3\right)}^{2}=8\left(y-3\right)$

Focus $\left(\frac{5}{2},-4\right)$ and directrix $x=\frac{7}{2}$

For the following exercises, determine the equation of the ellipse using the information given.

Endpoints of major axis at $\left(4,0\right),\left(-4,0\right)$ and foci located at $\left(2,0\right),\left(-2,0\right)$

$\frac{{x}^{2}}{16}+\frac{{y}^{2}}{12}=1$

Endpoints of major axis at $\left(0,5\right),\left(0,-5\right)$ and foci located at $\left(0,3\right),\left(0,-3\right)$

Endpoints of major axis at $\left(0,2\right),\left(0,-2\right)$ and foci located at $\left(3,0\right),\left(-3,0\right)$

$\frac{{x}^{2}}{13}+\frac{{y}^{2}}{4}=1$

Endpoints of major axis at $\left(-3,3\right),\left(7,3\right)$ and foci located at $\left(-2,3\right),\left(6,3\right)$

Endpoints of major axis at $\left(-3,5\right),\left(-3,-3\right)$ and foci located at $\left(-3,3\right),\left(-3,-1\right)$

$\frac{{\left(y-1\right)}^{2}}{16}+\frac{{\left(x+3\right)}^{2}}{12}=1$

Endpoints of major axis at $\left(0,0\right),\left(0,4\right)$ and foci located at $\left(5,2\right),\left(-5,2\right)$

Foci located at $\left(2,0\right),\phantom{\rule{0.2em}{0ex}}\left(-2,0\right)$ and eccentricity of $\frac{1}{2}$

$\frac{{x}^{2}}{16}+\frac{{y}^{2}}{12}=1$

Foci located at $\left(0,-3\right),\phantom{\rule{0.2em}{0ex}}\left(0,3\right)$ and eccentricity of $\frac{3}{4}$

For the following exercises, determine the equation of the hyperbola using the information given.

Vertices located at $\left(5,0\right),\left(-5,0\right)$ and foci located at $\left(6,0\right),\left(-6,0\right)$

$\frac{{x}^{2}}{25}-\frac{{y}^{2}}{11}=1$

Vertices located at $\left(0,2\right),\left(0,-2\right)$ and foci located at $\left(0,3\right),\left(0,-3\right)$

Endpoints of the conjugate axis located at $\left(0,3\right),\left(0,-3\right)$ and foci located $\left(4,0\right),\left(-4,0\right)$

$\frac{{x}^{2}}{7}-\frac{{y}^{2}}{9}=1$

Vertices located at $\left(0,1\right),\left(6,1\right)$ and focus located at $\left(8,1\right)$

Vertices located at $\left(-2,0\right),\left(-2,-4\right)$ and focus located at $\left(-2,-8\right)$

$\frac{{\left(y+2\right)}^{2}}{4}-\frac{{\left(x+2\right)}^{2}}{32}=1$

Endpoints of the conjugate axis located at $\left(3,2\right),\left(3,4\right)$ and focus located at $\left(3,7\right)$

Foci located at $\left(6,-0\right),\left(6,0\right)$ and eccentricity of 3

$\frac{{x}^{2}}{4}-\frac{{y}^{2}}{32}=1$

$\left(0,10\right),\left(0,-10\right)$ and eccentricity of 2.5

For the following exercises, consider the following polar equations of conics. Determine the eccentricity and identify the conic.

$r=\frac{-1}{1+\text{cos}\phantom{\rule{0.2em}{0ex}}\theta }$

$e=1,$ parabola

$r=\frac{8}{2-\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{5}{2+\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$e=\frac{1}{2},$ ellipse

$r=\frac{5}{-1+2\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{3}{2-6\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$e=3,$ hyperbola

$r=\frac{3}{-4+3\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

For the following exercises, find a polar equation of the conic with focus at the origin and eccentricity and directrix as given.

$\text{Directrix:}\phantom{\rule{0.2em}{0ex}}x=4;e=\frac{1}{5}$

$r=\frac{4}{5+\text{cos}\phantom{\rule{0.2em}{0ex}}\theta }$

$\text{Directrix:}\phantom{\rule{0.2em}{0ex}}x=-4;e=5$

$\text{Directrix: y}=2;e=2$

$r=\frac{4}{1+2\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$\text{Directrix: y}=-2;e=\frac{1}{2}$

For the following exercises, sketch the graph of each conic.

$r=\frac{1}{1+\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{1}{1-\text{cos}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{4}{1+\text{cos}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{10}{5+4\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{15}{3-2\phantom{\rule{0.2em}{0ex}}\text{cos}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{32}{3+5\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$r\left(2+\text{sin}\phantom{\rule{0.2em}{0ex}}\theta \right)=4$

$r=\frac{3}{2+6\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$r=\frac{3}{-4+2\phantom{\rule{0.2em}{0ex}}\text{sin}\phantom{\rule{0.2em}{0ex}}\theta }$

$\begin{array}{c}\frac{{x}^{2}}{9}+\frac{{y}^{2}}{4}=1\hfill \\ \hfill \end{array}$

$\frac{{x}^{2}}{4}+\frac{{y}^{2}}{16}=1$

$4{x}^{2}+9{y}^{2}=36$

$25{x}^{2}-4{y}^{2}=100$

$\frac{{x}^{2}}{16}-\frac{{y}^{2}}{9}=1$

${x}^{2}=12y$

${y}^{2}=20x$

$12x=5{y}^{2}$

For the following equations, determine which of the conic sections is described.

$xy=4$

${x}^{2}+4xy-2{y}^{2}-6=0$

Hyperbola

${x}^{2}+2\sqrt{3}xy+3{y}^{2}-6=0$

${x}^{2}-xy+{y}^{2}-2=0$

Ellipse

$34{x}^{2}-24xy+41{y}^{2}-25=0$

$52{x}^{2}-72xy+73{y}^{2}+40x+30y-75=0$

Ellipse

The mirror in an automobile headlight has a parabolic cross section, with the lightbulb at the focus. On a schematic, the equation of the parabola is given as ${x}^{2}=4y.$ At what coordinates should you place the lightbulb?

A satellite dish is shaped like a paraboloid of revolution. The receiver is to be located at the focus. If the dish is 12 feet across at its opening and 4 feet deep at its center, where should the receiver be placed?

At the point 2.25 feet above the vertex.

Consider the satellite dish of the preceding problem. If the dish is 8 feet across at the opening and 2 feet deep, where should we place the receiver?

where we get a research paper on Nano chemistry....?
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
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Good
can you provide the details of the parametric equations for the lines that defince doubly-ruled surfeces (huperbolids of one sheet and hyperbolic paraboloid). Can you explain each of the variables in the equations?