Power generation technologies such as coal-fired power plants nuclear reactors and wind turbines offer various strengths and weaknesses to power generation companies and their customers.
Renewable Energy Technologies is an umbrella term for energy production from renewable sources such as solar wind, hydro hydroelectric tidal biomass biofuels, and waste and geothermal. In my opinion, the most important technical need related to energy is to make energy sources cheaper safer, and more socially acceptable.
This is reflected in an inexhaustible resource that is environmentally friendly and cheap to process to generate energy. Renewable energy sources play an important role in ensuring sustainable energy with low emissions. It is already recognized that renewable energy technologies can significantly meet power demand and reduce emissions. The country has developed sustainable methods for its energy supply in recent years.
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A girl throws a basketball vertically into the air. What is true about the basketball at the highest point?
Which of the following statements is NOT true about wave packets and their use in describing particles?
a. A wave packet is fundamentally a region over which a number of waves of different frequencies and amplitudes are added together to form a non-zero result.
b. The movement and travel of a wave packet is governed by the phase velocity.
c. An important property of a wave packet describing a particle is the superposition of many different waves.
d. The particle can be described using Fourier series and a Fourier integral.
e .An important property of a wave packet describing a particle is the localization of wave amplitude.
Answer:
b) is not true - the movement and travel of a wave packet is governed by the "group" velocity of the packet not the phase velocity
The movement and travel of a wave packet are governed by the "group" velocity of the packet, not the phase velocity, so option B is not a true statement.
What are wave packets?
A collection of waves with roughly the same momentum is referred to as a wave packet. Localization of particles can be achieved by combining waves into wave packets. The area where the particle is most likely to be discovered is indicated by the wave packet's envelope. This region spreads at the speed of a classical particle.
According to Heisenberg's principle, some uncertainty in the momentum must be permitted in order to gain some localization of the position of a paragraph. Therefore, you must assume that the initial quantum space wave function is nonzero for at least a brief range of various quantum values. A wave packet is a combination of constituent waves of this kind.
The movement and travel of a wave packet are governed by the "group" velocity of the packet, not the phase velocity.
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Can someone Please help me? One of the main disadvantages of incandescent lights is that _________.
the light they cast is hard on the eyes
only 10% of the energy makes light
they need extra sockets to be used in a normal house
Answer: Only 10% of the energy makes light
Explanation:
how does the force of friction for a sliding object vary with speed?
The friction and the velocity of the object are inversely proportional to each other.
The velocity of the object sliding over a rough surface decreases with the increase in friction.
Let us assume that ab object is sliding over a rough surface.
Now, if the object is at rest, the static friction completely keeps the object at rest.
While sliding, the friction opposes the motion of the body.
If an object is sliding on a surface with some velocity and no external force is applied. The velocity will decrease in sometime and will become zero.
If an external force is applied in the direction of motion of object, the friction will be in work but it will work only as a opposing force. So, it will always try to decrease the velocity.
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HELP PLEASE ASAP!!!
How many moles are in 7.60g of water, H₂O?
Answer: 24
Explanation: because my brain said..
In an element’s square on the periodic table, the number with the greatest numerical value represents the
The table shows the values of two quantities for an astronaut on Earth and Venus.
Astronaut's Details
Venus
Quantity A 80 units
80 units
Quantity B 784 units 709.6 units
Earth
Which of the following names the quantity and correctly explains why that represents the astronaut's weight?
O Quantity A, because it remains the same throughout
O Quantity B, because it is independent of other quantities
O Quantity B, because it changes with gravitational strength
O Quantity A, because it measures the force acting on the astronaut
The correct statement is - Quantity B, because it changes with gravitational strength.
Quantity B is Weight
Quantity A is the Mass - because it remains constant throughout.
What is Weight and Mass?Weight represents the amount of gravity exerted on a person's body. Given that weight is a force, its SI unit is also a force; hence, the SI unit of weight is the Newton (N). Because the earth's shape is not completely spherical but rather an oblate spheroid, someone standing at the equator is farther from the earth's center than someone standing at the north pole. Because the acceleration of gravity is proportional to the square of the distance between two objects, a person at the north pole would feel more weight because he is closer to the earth's center than someone at the equator. Since weight is a force Since it uses the same SI unit as force, the weight SI unit is the Newton (N).The amount of matter that makes up an object is measured in terms of mass, whereas the gravitational pull of an object is measured in terms of weight.To learn more about Weight and Mass, refer to:
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20 points please help and explain thank you so much!!!A car traveling north at a velocity of 15m/s needs to pass a slower moving vehicle. The driver of the car speeds up to 20 meters per second to get around the slower vehicle. The passing time is 5.8 seconds. What is the car's acceleration?
The acceleration of the car when get around the slower vehicle is 0.86m/s².
The initial velocity U of the car is 15m/s.
The final velocity V of the car is 20m/s.
The time taken by the car to overtake the slow vehicle is 5.8 seconds.
To find the acceleration of the car, we can use the equation of motion,
The equation is,
V = U + at
Where,
V is final velocity of object,
U is the initial velocity if the object,
a is the acceleration of the body,
t is the time taken by the body to accelerate,
Putting all the values of find the acceleration a of the car,
V = U + at
20 = 15 + a5.8
5 = a5.8
a = 5/5.8
a = 0.86 m/s².
So, the acceleration of the car is 0.86 m/s
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What is the wavelength in picometers of light with a frequency of 9. 3 × 10^18 hz?.
The wave length in picometers for above problem was 32pm
What is wavelength?
Have you ever given any thought to why it is possible for humans to perceive colour? The explanation is that different light wavelengths of electromagnetic radiation are what give colours their distinct appearance. The visible portion of the electromagnetic spectrum is also known as visible light. These colours also come in a variety of wavelengths. Learn more about wavelength and visible light's wavelength in this article. The distance between the two crests or troughs of the light wave is known as the wavelength of light. Using the Greek letter lambda (λ), it is identified. As a result, wavelength refers to the separation between one wave's crest or trough and the following wave.
v=c/λ
v: 9.3 × 10^18 Hz c: 3.00*10^8 λ:
9.3 × 10^18 Hz
λ = 3.0010^8 m/s /9.3× 10^18
The calculated wavelength is in unit of meter. use the relationship between meter and nanometer to convert to the correct units.
= 32 nm
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what is wg , the work done on the block by the force of gravity as the block moves a distance l up the incline? express the work done by gravity in terms of the weight w and any other quantities given in the problem introduction.
Work done on the block by the force of gravity as the block moves a distance L up the incline is - m*g*l*sinФ.
To move an object, it should be first transferred to energy. Transferring energy may be in the method of force. The quantity of energy transferred by the force to move an object is known as work done.
To express mathematically, work is equal to the force times the distance W = fd.
If force is exerted at an angle θ to the displacement then the work done is given by W = fd cos θ
Given,
applied force=F
angle=Ф
We have to evaluate work done by the force due to gravity,
We know that g= 9.8 m/s^2
Work done= m*g* sinФ * l *cos 180° +m*g* l *cos 90°
w = -m*g* sinФ* l + m*g *cosФ* l *0
As we know, cos 180° = -1
and cos 90° = 0
w = - m*g*l*sinФ
Hence, the work done on the block by the force of gravity as the block moves a distance L up the incline= - m*g*l*sinФ
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You place a box weighing 307.4 N on an inclined plane that makes a 44◦ angle with the horizontal.
The vertical component of the box's weight is 221.1 N.
What is the vertical component's of the box weight?
The vertical component of the box's weight is the weight of the box acting along the vertical direction of the inclined plane.
Mathematically, the formula for calculating the vertical component of the box's weight is given as;
Wn = mg cosθ
where;
m is mass of the boxθ is angle of inclination of the planeg is acceleration due to gravityWn = W cosθ
where;
W is weight of the boxWn = 307.4 N x cos(44)
Wn = 221.1 N
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The complete question is below;
You place a box weighing 307.4 N on an inclined plane that makes a 44◦ angle with the horizontal. Find the vertical component of the box's weight.
a laser pointer is placed on a platform that rotates at a rate of 1616 revolutions per minute. the beam hits a wall 8 m8 m away, producing a dot of light that moves horizontally along the wall. let thetaθ be the angle between the beam and the line through the searchlight perpendicular to the wall. how fast is this dot moving when theta
When a laser pointer is placed on a platform that rotates at a rate of 1616 revolutions per minute and beam hits a wall 8 m away, producing a dot of light that moves horizontally along the wall, then speed is calculated as, v= 430.88πsec²Ф
A small handheld device with a power source and a laser diode that emits very narrow coherent low-powered laser beam of visible light is a laser pointer.
As angle made with the vertical is given so we can write,
tanФ = x/8
x= 8 tanФ
differentiating both sides with time
v= dx/dt= 8 ω sec^²Ф* d/dt
As we know that;
ω= 2πf
=2π/1616/60
= 53.86π
v= 8*53.86π*sec²Ф
= 430.88πsec²Ф
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Determine the required radius for the Sun to become a Black Hole. Write the name for the radius
Given:
The mass of the sun is
[tex]M_{sun}=1.989\times10^{30}\text{ kg}[/tex]The universal gravitational constant is
[tex]G\text{ = 6.67}\times10^{-11}\text{ Nm}^2\text{ /kg}^2[/tex]The speed is
[tex]c=\text{ 3}\times10^8\text{ m/s}[/tex]To find the required radius for the sun to become a black hole.
Explanation:
The radius can be calculated as
[tex]\begin{gathered} r=\frac{2GM}{c^2} \\ =\frac{2\times6.67\times10^{-11}\times1.989\times10^{30}}{(3\times10^8)^2} \\ =2948\text{ m} \end{gathered}[/tex]The name of the radius is Schwarzschild radius.
the most severe diffuse brain injury caused by rotational acceleration is most likely to be located in the: a. medial portion of the brainstem. b. diencephalon to the brainstem. c. diencephalon. d. entire brainstem.
The most severe diffuse brain injury caused by rotational acceleration is most likely to be located in the option (d) entire brainstem is correct.
What is rotational acceleration?Angular acceleration is the term used to describe the temporal pace at which angular velocity varies.
The SI of measurement is radians per second per second.
v = ω × r . The equation of angular velocity can be obtained by rewriting this expression as follows: = r v / |r|2, where all of these variables are vectors and |r| stands for the absolute value of the radius.
Rotational acceleration is a type of brain damage brought on by a traumatic event in which the body's pace is disrupted and the head moves freely, out of step with the body's neck, chest, and/or lower limbs.
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saturn is an average distance of 1.4×109 km from the sun. estimate the length of the saturnian year using the fact that the earth is 1.50×108km from the sun on the average.
Answer:
Kepler's third law:
P^2 = K R^3 the period squared is proportional to the cube of the radius
Ps^2 = K Rs^3
Pe^2 = K Re^3
Ps^2 / Pe^2 = Rs^3 / Re^3 dividing equations
Ps = (Rs / Re)^3/2 * Pe
Ps = (1.4E9 / 1.5E8)3/2 * 1 yr
Ps = 28.5 yrs
(Actual = 10759 da / 365.25 da = 29.5)
Determine the weight on the moon of a person whose weight on the earth is 190 pounds.
Answer: Weight = 140.05 N
Explanation:
The formula for calculating weight of an object on the moon is expressed as
weight = mg
where
m = mass of the object
g = acceleration due to gravity of the moon
From the information given,
m = 190 pounds
We would convert 190 pounds to kg
1 pound = 0.45359237 kg
190 pounds = 190 x 0.45359237 = 86.183 kg
g = 1.625 m/s^2
Thus,
w = 86.183 x 1.625
w = 140.05 N
all of its output energy is absorbed in a detector that measures a total energy of 0.53 j over a period of 34 s . how many photons per second are being emitted by the laser?
Given that detector measures total energy of 0.53 J over a period of 34s. Photons per second emitted by the laser is 7.84 x 10¹⁶ photons/s
Device that emits a beam of coherent light through an optical amplification process is called Laser. Types of lasers include gas lasers, fiber lasers, solid state lasers, dye lasers and diode lasers .
Given total energy = 0.53 J
period = 34 s
As we know Wavelength of the Photon = 989 nm
Energy of single photon is given by formula,
E= hc/λ
Total energy= (6.626* 10^-34*2.998*10^8)/(989*10^-9)
= 2.01 *10^-19 J
Time period = 34s
Energy absorbed per sec = 0.53/34= 0.0155 J/s
Energy of a photon= 2.01*10^-19 J
Number of photons emitted per second is = 0.0155/2.01*10^-19
= 7.711* 10^16 J/photon
Number of photons = 7.771 x 10¹⁶ photons/s
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a tsunami question 1 options: a) is a special kind of tidal wave caused by the gravitational attraction of the sun not the moon. b) can get big but never bigger than 30 feet high. c) is dangerous near its source but dies out within about 200 miles. d) may be just a broad, gentle swelling out at sea but grows as it approaches shore.
A tsunami may begin as a broad, gradual swelling at sea but grows closer to land.
The tsunami is what?Ocean waves called tsunamis are caused by: large earthquakes that take place near or beneath the ocean. lava outbursts. landslides underwater. Onshore landslides that release a lot of debris into the water
What is a landslide catastrophe?Landslides happen when sloped ground becomes unstable. Earth, rocks, mud, and any other debris that may be trapped in its wake can all be found in the unstable terrain that collapses and pours down the side of a hill or mountain. Landslides can cause significant harm if they happen close to populated areas.
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What is the meaning of E = MC2, and why is it very famous everywhere?
The meaning of E = MC² is a energy. It is important because it helps us to calculate the amount of energy required.
What is energy?Energy is defined as the capacity to exert a force causing the displacement of an item, which is the ability to do work.
There are mainly two types of energy.
Potential energy - It is defined as the energy that an object retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.Kinetic energy - It is defined as a type of energy that a particle or an object has as a result of its motion.Thus, the meaning of E = MC² is a energy. It is important because it helps us to calculate the amount of energy required.
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A boy throws a tennis ball 90 degrees from the horizontal with initial velocity of 2.2 m/s. Find the maximum height of the ball.
Answer:
Explanation:
Given:
α = 90°
V₀ = 2.2 m/s
__________
H - ?
H = V₀² / (2*g) = 2.2² / (2*10) ≈ 0.24 m
The maximum height obtained by the ball is 24 cm.
What is velocity?The pace at which an object's position changes in relation to a frame of reference and time is what is meant by velocity. Since it is a vector quantity, the definition of velocity requires both magnitude (speed) and direction. Its SI unit is the meter per second (m/s).
Given parameters:
Initial velocity of the tennis ball, u = 2.2 m/s.
And the ball is thrown at 90 degrees from the horizontal .
So, acceleration due to gravity acts on the ball in opposite direction of motion and value of it is 9.8 m/s².
At maximum height H; final velocity (v) is zero.
Using v² = u² - 2as we get,
0² = 2.2² - 2×9.8×H
⇒ H = 2.2²/(2×9.8)
⇒ H = 0.24 m.= 24 cm.
Hence, the maximum height of the ball is 24 cm.
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A cheetah can run at a maximum speed 105 km/h and a gazelle can run at a maxi- mum speed of 73.5 km/h. if both animals are running at full speed, with the gazelle 99 m ahead, how long before the cheetah catches its prey?
If both animals are running at full speed, with the gazelle 99 m ahead, cheetah will catch its prey after 331 m
v = d / t
v = Velocity
d = Distance
t = Time
Let the distance covered by the gazelle be x.
For cheetah,
v = 105 km / h
d = ( 99 + x ) m
t = d / v
t = 105 / ( 99 + x ) s
For gazelle,
v = 73.5 km / h
d = x m
t = d / v
t = 73.5 / x
The time taken by both cheetah and gazelle will be the same when the cheetah catches its prey.
105 / ( 99 + x ) = 73.5 / x
105 x = 7276.5 + 73.5 x
31.5 x = 7276.5
x = 231 m
Distance travelled by cheetah = ( 99 + x ) m
Distance travelled by cheetah = ( 99 + 231 ) m
Distance travelled by cheetah = 331 m
Therefore, the cheetah will catch its prey after 331 m
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An object has a kinetic energy of 180 J and a mass of 45 kg, how fast is the object
moving?
Your answer
An object has a kinetic energy of 180 J and a mass of 45 kg, The object is moving fast with 2.83 m/sec
What is kinetic energy?Kinetic energy is the energy of motion, which can be observed as an item, particle, or collection of particles moving. Kinetic energy is used by any moving object: a person walking, a baseball being thrown, a crumb falling off a table, and a charged particle in an electric field are all instances of kinetic energy at work.
Given that,
Kinetic energy (K.E) = 180 J
Mass (m) = 45 kg
As we know, K.E = [tex]\frac{1}{2}mv^{2}[/tex]
Now we have to calculate the speed or velocity (v)
v = [tex]\sqrt{(2*K.E.)/m}[/tex]
v = [tex]\sqrt{(2*180)/45}[/tex]
v = 2.83 m/sec
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help me with this please full calculations
Helping is melting please
f(x) means a function of x. In this case, the function of x is 3x - 5
So if you have f(2), apply the function with the value of x equal to 2. In this case, just plug 2 into the equation where x is :
f(x) = 3x - 5
f(2) = (3)2 - 5
f(2) = (3 . 2) - 5
f(2) = 6 - 5
f(2) = 1
The function is shown in the figure below. Since this is a linear function we can see that the graph intersects the x-axis at only one point. This equation is a linear equation with two variables. Since there is a unique value of y for every value of x, we find them accordingly and set x = 0, then y = 5. So (0.5) is the answer you get. F values are used in the analysis of variance (ANOVA). It is calculated by dividing the two mean squares. This calculation determines the ratio of explained to unexplained variance. The F distribution is a theoretical distribution.
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what is a way for scientists to find out about the internal parts of life science specimens
Scientists find out about the internal parts of life science specimen by a method called fixation and the examination of sample under microscope.
Specimen is the whole or a part of an organism, plant or rock collected and preserved as an example of its class and species. It is further used to study the properties of the whole population of the species.
Specimen is collected by withdrawing blood, collecting urine, or swabs from mucosal surfaces. Specimen collection is performed using aseptic techniques to avoid contamination from bacteria or other bodily fluids.
After the liquid is added to the slide, a coverslip is placed on top and then the specimen becomes ready for examination under the microscope. Another method of preparing specimens for light microscopy is “fixing” that refers to the process of attaching cells to a slide.
There are 5 steps for the preparation of samples:
Fixation is done immediately after the removal of the sample that is to to be observed.
Embedding is done by fixation in a fixative solution.
Sectioning is carried out using microtomy
Staining and also immunolabeling
Finally mounting.
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its is but also not a math question
The distance travelled by the car on the first hour of the trip is 80 km, the average speed for the first hour of the trip is 80 kmph and for the first four hours of the trip is 92.5 kmph
v = d / t
v = Velocity
d = Distance
t = Time
For the first one hour,
d = 80 km
t = 1 hr
v = 80 / 1
v = 80 kmph
For the first four hours,
d = 370 km
t = 4 hr
v = 370 / 4
v = 92.5 kmph
Therefore,
Distance travelled in first 1 hour = 80 kmAverage speed in first hour = 80 kmphAverage speed in first four hours = 92.5 kmphTo know more about average velocity
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A visible light wave has a wavelength of 450 nm (i.e. 4.5 x 107 m)
Calculate its frequency using the equation v= fxλ
Show your working and give your answer to 3 significant figures.
Frequency: .......
Hz
Answer:
Approximately [tex]6.67 \times 10^{14}\; {\rm Hz}[/tex], assuming that the wavelength was measured in vacuum.
Explanation:
Let [tex]v[/tex] denote the speed of the wave, [tex]f[/tex] the frequency of the wave, and [tex]\lambda[/tex] the wavelength of this wave. It is given that [tex]v = \lambda\, f[/tex].
It is given that the wavelength of this light is [tex]\lambda = 450\; {\rm nm} = 4.50 \times 10^{-7}\; {\rm m}[/tex]. Assume that this wavelength is measured when the light beam is in vacuum, where the speed of light (wave speed) is [tex]v = c \approx 3.00 \times 10^{8}\; {\rm m\cdot s^{-1}}[/tex].
Rearrange the equation [tex]v = \lambda\, f[/tex] to find the frequency [tex]f[/tex] of this wave:
[tex]\begin{aligned} f &= \frac{v}{\lambda} \\ &\approx \frac{3.00 \times 10^{8}\; {\rm m\cdot s^{-1}}}{4.50 \times 10^{-7}\; {\rm m}} \\ &\approx 6.67 \times 10^{14}\; {\rm s^{-1}}\end{aligned}[/tex].
Note that [tex]1\; {\rm Hz}[/tex] is equivalent to [tex]1\; {\rm s^{-1}}[/tex]. Therefore, the frequency of this wave would be [tex]f \approx 6.67 \times 10^{14}\; {\rm Hz}[/tex].
A quarterback throws the football to a stationary receiver who is 28.4 m down the field.
The football is thrown at an initial angle of 38.6 to the ground.
The acceleration of gravity is 9.81 m/s?.
a) At what initial speed must the quarterback throw the ball for it to reach the receiver?
Answer in units of m/s.
The following question is about football movement and can be answered by using the equations of projectile launch :
Initial speed is: v = 16.89 m / s
Maximum height is: y = 14.26m
Given parameters
Horizontal distance x = 28.4 m
Launch angle tea = 38.6º
To find,
The initial speed and the maximum height
R = [tex]v^{2}[/tex]sin2θ/g
[tex]v^{2}[/tex]= g*r/sin2θ
calculating,
v² = 9.8 *28.4 / sin (2 *38.6)
=[tex]\sqrt{278.32/0.9751}[/tex]
v = 16.89 m / s
The vertical speed is zero when height maximum.
v² = v² - 2 g y
0 = v² - 2g y
y = v²/2g
y = 14.26m
Initial speed is: v = 16.89 m / s
Maximum height is: y = 14.26m
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young stars that vary erratically in luminosity and have especially strong stellar winds are called
Young stars that vary erratically in luminosity and have especially strong stellar winds are called T-Tauri stars.
What is luminosity physics?The entire amount of energy generated by various celestial bodies (stars, galaxies) per unit of time is referred to as luminosity, which would be essentially measured in joules per sec or watts in SI units.
Does luminosity mean light?The characteristic of something that emits light or glows with reflected light is called luminosity. The brilliance of a huge, sparkling diamond is what is most striking. You might use the word "luminosity" to describe a vivid and colorful oil painting or to praise the brightness of a spectacular sunset.
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Differences between mercury and alcohol as thermometric liquid
Help me ASAP please
Answer:Mercury has a greater coefficient of thermal expansion than alcohol. This means a column of mercury will expand and rise more than a column of alcohol for the same temperature change. As a result, you can get finer readings with mercury
Explanation:
a runner 2.88m/s north she accelerates at 0.350m/s^2 at a -52 degree angle. at the point in the motion when she is running directly east, what is her Delta y ?
The motion when she is running directly east is Δx = 11.7 and Δy = 15.
To determine the slope of a line select two points on the line and calculate the delta y change in y value to determine the change in elevation. Divide the change in x value by the delta x to determine the change in width. The derivative of y is the square of x with respect to y.
So the derivative of something squared with respect to something is multiplied by the derivative of that thing with respect to x. That's exactly the chain rule. Yes, it means exactly the same. y in Newton notation and dy/dx in Leibniz notation. Newton and Leibniz independently invented calculus at about the same time, so in this case, they used different notations to express the same rate of change.
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