The index of refraction of a material in which the red-light wavelength is 450 nm is 1.38≤n≤1.67.
What is index of refraction?Refractive Index (Index of Refraction) is a value calculated from ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by letter n or n' in descriptive text and mathematical equations.
The refractive index n is the factor by which wave slows down relative to the speed of light in vacuum c0 . Almost always, frequency of a wave is constant and so it is the speed and wavelength that change as light passes from one medium into another.
So the wavelength λ inside of the medium is related to free space wavelength λ0 through the refractive index n .
λ=λ0/n
Red light has free space wavelength λ0 of anywhere from 620 nm to 750 nm. All of those of wavelengths look red to our eyes. From above equation refractive index is
n1=λ0/λ=620 nm/450 nm=1.38
n2=λ0/λ=750 nm/450 nm=1.67
Based on information you gave, the refractive index could be anything in the range 1.38≤n≤1.67.
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You are preparing to attach wires in a 110 block. You want to connect the wires and trim off the excess at the same time
To connect the wires in a 110 block and trim off the excess at the same time, use a punch down tool with a notched blade and point the cut side of the tool towards the wire end.
A 110 block is used to terminate wiring in a cabling system. It is a type of punch down block. This block has a plastic base and have 50 slots for individual wires, meaning it can terminate 25 pairs.
A punch down tool is used insert wire into insulation displacement connectors present in punch down blocks such as 110 block and also in other electrical panels and modules.
Therefore, to connect the wires in a 110 block and trim off the excess at the same time, use a punch down tool with a notched blade and point the cut side of the tool towards the wire end.
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The work done to compress a gas is 74 j. as a result, 26 j of heat is given off to the surroundings. calculate the change in internal energy of the gas.
The change in internal energy is -48 joule.
We need to know about internal energy to solve this problem. For a closed system, with matter transfer excluded, the changes in internal energy are due to heat transfer and due to thermodynamic work done by the system on its surroundings. It can be determined as
ΔU = Q - W
where ΔU is the change in internal energy, Q is heat and W is work done.
From the question above, we know that
W = 74 joule
Q = 26 joule
By substituting the given parameter, we can calculate the change in internal energy
ΔU = Q - W
ΔU = 26 - 74
ΔU = -48 joule
The internal energy change is negative because the work done on the system is greater than the heat released.
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Find the work done on a 50 Kg student by the elevator in 2 seconds, if the elevator is :
1) Accelerating upwards from rest at a rate of 2 ms-2
2) Accelerating downwards from rest at a rate of 2 ms-2
3) Decelerating upwards from an initial speed of 4 ms-1 at a rate of 2 ms-2
4) Decelerating downwards from an initial speed of 4 ms-1 at a rate of 2 ms-2
5) Moving upwards at a speed of 2 ms-1
6) Moving downwards at a speed of 2 ms-1
( Let g = 10 ms )
The work done on a 50 Kg student by the elevator in 2 seconds if the elevator is accelerating upwards from rest at a rate of 2 ms⁻² would be
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance.
The work done is the multiplication of applied force with displacement.
Work Done = Force × Displacement
As given in the problem we have to find the work done on a 50 Kg student by the elevator in 2 seconds if the elevator is accelerating upwards from rest at a rate of 2 ms⁻²,
Lets us first calculate the displacement of the elevator in 2 seconds if it is accelerating upwards from rest at a rate of 2 ms⁻².
s = ut + 0.5at²
= 0 + 0.5×2×2²
= 4 meters
The work done on the elevator = mgh
=50×9.81×4
=1962 joules
Thus, the work done on the elevator would be 1962 joules.
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Predict the effects of a drug that blocks the sympathetic nervous system on blood pressure and heart rate. how would this drug affect the three factors that determine blood pressure?
It would decrease cardiac output, peripheral resistance, and blood volume.
Cardiac output (CO), the volume of blood the heart pumps each minute, is the mechanism through which blood circulates throughout the body, particularly supplying the brain and other crucial organs with blood flow. When exercising, for example, the body's need for oxygen fluctuates, and changing both heart rate (HR) and stroke volume affects cardiac output (SV).
As a result, a complicated mechanism combining the autonomic nervous system, endocrine, and paracrine signaling pathways is responsible for controlling cardiac output. Every tissue in the body depends on the heart to pump blood to it in order to survive, hence any cardiovascular failure could have a large negative impact on morbidity and mortality.
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A stone dropped from a cliff hits the ground 3.00 s later. Find (a) the speed with which the stone hits the ground, and (b) the distance it fell.
(a) The speed as the stone hits the ground is 29.4 m/s (b) The distance at which the stone fell is 44.1 m.
What is speed?Speed can be defined as the ratio of distance to time.
(a) To calculate the speed at which the stone hit the ground, we use the formula below.
Formula:
v = u+gt............ Equation 1Where:
v = Final speed of the stoneu = Initial speed of the stone = 0 m/st = time = 3 secondsg = acceleration due to gravity = 9.8 m/s²Substitute the values above into equation 1
v = 0+3×9.8v = 29.4 m/s(b) To calculate the distance the stone fell, we use the formula below.
S = ut+gt²/2........... Equation 2Where:
S = DistanceSolving for S by substituting into equation 2
S = (0×3)+(9.8×3²)/2S = 44.1 mHence, (a) The speed as the stone hits the ground is 29.4 m/s (b) The distance at which the stone fell is 44.1 m.
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A tennis ball is dropped from 1.58 m above the
ground. It rebounds to a height of 0.979 m.
With what velocity does it hit the ground?
The acceleration of gravity is 9.8 m/s-
Answer in units of m/s.
The calculated final velocity is Vf = 4.77 m/s
When gravity first exerts force on an object, its initial velocity defines how quickly the object moves. The final velocity, on the other hand, is a vector number that gauges a moving body's speed and direction after it has reached its maximum acceleration. By applying the third equation of motion during the downward motion, we can quickly determine the final velocity or the velocity at which the ball reaches the ground. Following is the third equation of motion:
Where g = the acceleration of gravity = 9.8 m/s², h = the height = 1.16 m, and Vf = the final velocity of the ball =?
Vi = Ball's Initial Velocity = 0 m/s (Since the ball was at rest initially)
As a result, when we use these values in the equation, we obtain:
(2) Vf2 = (9.8 m/s²) (1.16 m) - (0 m/s)
Vf = 4.77 m/s
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What is the magnitude of the resultant vector? 10 meters 50 meters 1200 meters 2500 meters
Answer:
either vector
Explanation:
If the magnitude of the resultant of the two equal vectors is equal to the magnitude is equal to neither both vectors
If gasoline has a density of 0.680 g/cm3, what is the volume of 4,400 g of gasoline?
The volume of gasoline with a density of 0.680 g/cm3 and a mass of 4,400 g is: 6,470.58 cm3
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d= 0.680 g/cm3m = 4,400 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v = 4,400 g/0.680 g/cm3
v = 6,470.58 cm3
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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The weight of cans of fruit is normally distributed with a mean of 1,000 grams and a standard deviation of 50 grams. what percent of the cans weigh 860 grams or less?
The desired outcomes for standard variation are;
a. [tex]P(X < 860) = P(z < -2.80) = 0.0026 = 0.26%[/tex]
b.[tex]P(1055x1100) = P(z2.00-z1.10) = 0.9772-0.8643 = 0.1129 = 11.29%[/tex]
c.[tex]86.17%[/tex]% if [tex]P(860 X 1055) = P(z 1.10) - P(z -2.80) = 0.8643 - 0.0026[/tex]
You will need the probabilities P(X 860), P(X 1055) and P(X 1100) from the cumulative normal probability distribution for the variable X in order to calculate these values (the weight of a can of pears, in this case).
The straightforward approach is to use the connection to reduce the required values of X to the reduced parameter z instead of laboriously deriving this information from the equation for this distribution and the given values for its mean and standard deviation.
z = (X - μ)/σ
which results in X = 860 z = -2.80, X = 1055 z = +1.10, and X = 1100 z = +2.00 in this instance.
You then check a public table for the cumulative standard normal distribution for the fractional probability for the necessary z values.
- To the tabular value P, add 0.5 for positive z. (z)
- To account for negative z, deduct from 0.5 the P(z) value that corresponds to positive z.
[tex]P(z) = 0.4974 for z = 2.80,[/tex] which means that,[tex]P(z -2.80) = 0.5 - 0.4974 = 0.0026.[/tex]
[tex]P(z) = 0.3643[/tex] and [tex]P(z 1.10) = 0.3643 + 0.5 = 0.8643[/tex] for [tex]z = 1.10[/tex] respectively
[tex]P(z) = 0.4772[/tex] and [tex]P(z 2.00) = 0.4772 + 0.5 = 0.9772[/tex] for [tex]z = 2.00.[/tex]
Finally, we can get the desired outcomes.
a. [tex]P(X < 860) = P(z < -2.80) = 0.0026 = 0.26%[/tex]
b.[tex]P(1055x1100) = P(z2.00-z1.10) = 0.9772-0.8643 = 0.1129 = 11.29%[/tex]
c.[tex]86.17%[/tex]% if [tex]P(860 X 1055) = P(z 1.10) - P(z -2.80) = 0.8643 - 0.0026[/tex]
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A local store charges 1.5 each month on the unpaid balance for its credit account. what nominal interst rate is being charged?
The nominal interest rate is being charged is 19.56 %
Nominal and Effective Interest Rate:Interest bearing financial instruments state the rate of interest they pay. this is often the nominal interest rate. The effective rate of interest , on the opposite hand, accounts for the rate of interest compounding effect, thus, it's the actual interest rate an instrument pays during a given period (often a year).
Evaluating :18% is the nominal annual interest rate.
The monthly interest rate is 1.5%. Hence, the nominal interest rate in a year (12 months) is 18% = 12 x 1.5%.
19.56% is the (annual) effective interest rate (EIR).
EIR = ( 1+( r / n))ⁿ − 1, such as r is the annual interest rate and n is the number of periods.
Here, n = 12 and ( r/ n ) = .015 or 1.5%. Therefore,
EIR =( 1 + .015 ) 12 − 1 = .1956 or 19.56%.
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To launch a 100 kg human so that he leaves a cannon moving at a speed of 4 m/s, you need a spring with an appropriate spring constant. This spring will be compressed 2. 0 m from its natural length to launch the person. Which spring constant do you need?.
To launch a 100 kg human at the given speed, the spring constant needed is 400 N/m.
What is spring constant?This is the ratio of applied force on a spring to the extension produced by the spring.
The spring constant of the spring is calculated by applying the principle of conservation of energy.
The elastic potential energy of the spring will be converted into kinetic energy of the human so that the human will be launched at the desired speed.
U = K.E
¹/₂kx² = ¹/₂mv²
k = mv²/x²
where;
m is mass of the humanv is the speed of the cannonx is the extension of the springk is the spring constantSubstitute the given parameters and solve for the spring constant.
k = (100x 4²) / (2²)
k = 400 N/m
Thus, a spring constant of 400 N/m is need to maintain the law of conservation of energy, from elastic potential energy of the spring to kinetic energy of the human,
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Jonathan walks 3 meters to the west, 2 meters south, 5 meters to the east, and 4 meters to the north. Which of the following is true?
a
His displacement was 2.8 meters.
b
His distance traveled was 4 meters.
c
His distance traveled was 12 meters.
d
His displacement was 14 meters.
If Jonathan walks 3 meters to the west, 2 meters south, 5 meters to the east, and 4 meters to the north, his displacement would be 2.8 meters.
The final position of Jonathan is 2 m exact North-East to the starting point. This forms a square. We need the diagonal of the square which is the displacement of Jonathan.
Diagonal of a square = a √ 2
a = Side of the square
a = 2 m
d = 2 √ 2
d = 2.8 m
Displacement is the distance between initial and final position whereas distance travelled is the total distance travelled throughout the given amount of time.
Therefore, Jonathan's displacement was 2.8 meters.
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The kinetic and potential energy of a harmonic oscillator in motion:_________
a. are time-independent
b. are perfectly correlated
c. are independent
d. are perfectly anticorrelated
The kinetic and potential energy of a harmonic oscillator in motion
d) are perfectly anti-correlated.
Explanation:
A restoring force in a harmonic oscillator works in the direction of an equilibrium point.
Simple harmonic motion, which we refer to as repetitive motion, is produced by the force.
The system's mechanical energy, which includes both potential and kinetic energy, is ideally constant.
In actuality, the energy is preserved by allowing one quantity to grow as the other shrinks, and vice versa.
An anti-correlation is a term that describes a negative correlation.
Kinetic energy and potential energy are two types of energy that are frequently found in mechanical systems and are referred to as mechanical energy in physics.
The idea of mechanical energy conservation is based on an even more general principle known as the law of conservation of energy; the only distinction is that in mechanical energy conservation, all of the system's energy is either in the form of kinetic energy, potential energy, or both.
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Can one individual represent an entire population? Why or why not
Answer: No, they cannot
Explanation:
Because every individual has different emotions, different beliefs.
2. Solve graphically, using the
head-to-tail method.
What is the resultant of
these vectors?
12 units S, 6.0 units E,
3.0 units N
The result of two or more vectors is the outcome. it's the outcome of multiplying two or more vectors. The resultant result of adding the displacement vectors A, B, and C are vector R. An appropriately drawn, scaled, vector addition diagram is often used to compute vector R, as illustrated within the diagram.
What do three resultant vectors add up to?
Afbeeldingsresultat for these vectors' offspring
The outcome of multiplying vectors A + B + C is the same as that of multiplying vectors B + A + C or even C + B + A. The resultant result will be the same as long as all three vectors are present with the appropriate magnitude and direction. The resultant of two or more vectors is the outcome.
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Which process requires more energy: completelyvaporizing 1 kg of saturated liquid water at 1 atm pressure orcompletely vaporizing 1 kg of saturated liquid water at 8 atmpressure?
The correct answer would be the first option. That means completely vaporizing 1 kg of saturated liquid water at 1 atm pressure would require more energy.
Enthalpy of VaporizationThe enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the quantity of energy that must be added to a liquid substance in order to transform a quantity of that substance into a gas.
The enthalpy of vaporization decreases as the pressure increases, so it takes more energy to completely vaporize 1 kg of saturated liquid water at 1 atm than at 8 atm.
What is the enthalpy of the vaporization of water?The enthalpy of vaporization depends on the pressure at which that transformation occurs.
40.65 kJ/mol
The heat of vaporization value for water is 40.65 kJ/mol.
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Determine the magnitude of the resultant force fr=f1 f2 and its direction measured clockwise
The value of the resultant force and its direction is Fr = 8.03 kN; Ф = 1.22°
What are forces?
Forces are the definition of Newton's second law, which is stated under the relation:
∑ Force = mass × acceleration.
In other words, force is the origin of motion since it generates acceleration in a system.
We will use the parallelogram method to determine the magnitude of the resultant force, as follows:
Fr = √F2² + F1² - 2(F2×F1)Cos105°
Fr = √6² + 4² - 2(6×4)Cos105°
Fr = 8.03 kN
We apply the law of sines
Sen∅/6 = Sen105°/8.026
∅ = 46.22°
The Ф direction of Fr measured clockwise from the positive u-axis is
Ф = 46.22° - 45°
Ф = 1.22°
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Calculate the amount of extension of a spring with a spring constant of 1 kn/m, if the amount of work done in extending it is 50 j. give your answer in m
Answer:
W = 1/2 k x^2 work done in extending a distance x
x = (2 W / k)^1/2 = (2 * 50 N / 50 kn / m)^1/2
x = (.1 kn / 50 kn/m)^1/2 = .045 m
If this light exerts a total force f = 4.6 nn on the wall, how many photons per second are hitting the wall?
A photon is a tiny particle made up of electromagnetic radiation waves. Photons are simply electric fields traveling through space, as demonstrated by Maxwell. Let the number of photons N.
the surface: F = N (h/λ)
What are photons?A photon is a fundamental particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the electromagnetic force carrier. Because photons have no mass, they move at the speed of light in a vacuum, 299792458 m/s photons are quantized packets of energy. Because photons have a wavelength, their wave nature can be demonstrated. They have both velocity and mass, which gives them molecule nature. Photons and electrons are both fundamental quantum-mechanical particles, but they have very different properties. The photon is a type of elementary particle that acts as an energy carrier, whereas the electron is a subatomic particle that exists in all atoms.Therefore on the surface: F = N (h/λ)
Given F = 4.6 nN
assume λ = 633 nm
N = (4.6 ×[tex]10^{-9}[/tex] × 633 ×[tex]10^{-9}[/tex] )/(6.63 × [tex]10^{-34}[/tex]) photons / s
N = 4.68 × [tex]10^{18}[/tex] photons / s
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Please can someone really smart answer my quetion about physical change??
The properties of physical changes of matter include the following:
no new substances are formedno large heat changes are involved except in processes of change of statethe changes are easily reversibleWhat is physical change?Physical change is a form of change that occurs in matter in which no new substances are formed.
Matter undergoes two types of changes:
physical change, andchemical changePhysical change is a change that affects or changes only the physical properties of a substance.
The physical properties of matter include the following:
densitycolorphysical statevolumeshape, etc.During physical changes of matter, the following are observed:
no new substances are formedno large heat changes are involved except in processes of change of statethe changes are easily reversibleExamples of physical changes include:
evaporation of watermelting of icemelting of candle waxdissolution of sugar in waterdissolution of salt in waterIn conclusion, physical changes are changes which affect only the physical properties of a substance and in which no new substance is formed.
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If the efficiency of a lever 45% and you put in an effort force is 28N. The box is lifted 1.5m, what is the output work done?
The output work done by the lever is 18.9 J.
What is output work?Output work is the product of laod and the distance moved by load.
The S.I unit of output work is Joules (J).
To calculate the output work done by the lever, we use the formula below,
Formula:
E' = (W'/Ey)100......... Equation 1Where:
E' = Efficiency of the machineW' = Output workE = Efforty = Distance moved by effortMake W' the subject of the equation
W' = E'×Ey/100......... Equation 2From the question,
Given:
E' = 45%E = 28 Ny = 1.5 mSubstitute these values into equation 2
W' = (28×45×1.5)/100W' = 18.9 J.Hence, the output work done by the lever is 18.9 J.
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What is the acceleration of the car in section a
Answer:
I am going to make an educated guess and say... B. 3 m/s²
Explanation:
I'm pretty certain that this is the correct answer.
For me, it was a toss-up between B and C, but I don't really think it's C.
But, then again, I am not 100% sure.
I hope you get it right! Have a blessed day! (✿◠‿◠)
I don't know how to work this, I'm very confused
How do I find the distance and displacement? (for both problems)
Answer:Доброе утро, отв
Explanation:
Доброе утро, отвДоброе утро, ответт
If we have 50 reported cases of angina and we want to select 5 for further review, then how many ways can we select these cases if order of selection matters?
We can select the cases in the order of selection matters 254,251,200
Permutation is the act of putting all the members of a set into a sequence or order in mathematics. In other words, if the set is already sorted, the act of reordering its pieces is known as permuting. Permutations may be found in practically every branch of mathematics, at varying degrees of prominence. They frequently appear when alternative orderings on finite sets are examined. The permutation formula is as follows.
nPr = ((n!) )/((n-r)!)
nPr = ((50!) )/((50-5)!)
nPr = ((50!) )/((45)!)
nPr = ((50*49*48*47*46*45)!)/((45)!)
nPr = 11441304000/45
nPr = 254,251,200
Therefore, there are 254,251,200 ways to select these cases if order of selection matters.
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How would you wire together individual solar cells to produce enough voltage to run a small 3.5-v motor? if one solar panel produces 0.5 v?
It is needed to connect seven solar panels in series to get 3.5 volts.
We need to know about the power supply circuit to solve this problem. When the power supply are connected in series, the total voltage is added up. It can be written as
V = V1 + V2 + .... + Vn
From the question above, we know that
V = 3.5 volt
Veach = 0.5 volt
Hence, we can calculate how many solar cells connected in series
V = V1 + V2 + .... + Vn
3.5 = 0.5(n)
n = 3.5 / 0.5
n = 7
Thus, we need to connect seven solar panels in series to get 3.5 volt.
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What is the average amount of teens with cell for the age groups 14, 15, and 16?
The average amount of small-town teens with cell phones for the age groups 14, 15, and 16 would be 348 as the average is given by the total sum divided by the number of items.
What is multiplication?Finding the product of two or more numbers in mathematics is done by multiplying the numbers.
As given in the problem we have to find out the average amount of teens with cells for the age groups 14, 15, and 16,
The average number of teens with cells = (273 + 341 + 430) / 3
The average number of teens with cells = 1044/ 3
=348
Thus, the average number of teens with cell phones for the age groups 14, 15, and 16 would be 348.
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The best leaper in the animal kingdom is the puma, which can jump to a height of 12. 0 feet when leaving the ground at an angle of 45°. With what speed must the animal leave the ground to reach that height?.
To reach a height of 12.0 feet with an angle of 45° the animal must leave the ground with a velocity of: 39.295 ft/s
The formulas for projectile motion that we will use to solve this exercise is:
h max = [vi² * (sinθ)²] / (2*g)
Where:
h max = maximum heightg = gravityvi = initial velocityInformation about the problem:
vi = ?θ= 45ºg = 32.17 ft/s²h max = 12.00 ftApplying the maximum height formula an clearing the initial velocity we have:
h max = (vi² * (senθ)²) / (2*g)
vi= √ [(h max * 2 * g) / (senθ)²]
vi= √ [12 ft * 2 * 32.17 ft/s² ) / (sen 45º)²]
vi= √ [772.08 ft²/s² / 0.5]
vi= √1544.16 ft²/s²
vi = 39.295 ft/s
What is projectile motion?The projectile motion is the motion whose trajectory describes a parabola having a horizontal and a vertical component of motion.
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Convert Kg to g
i. 6.57 Kg
Answer:
Kg to g we multiply by 1000
Explanation:
6.57×1000=6570g
Consider the triangle in the middle and write down the pythagorean rule(h/2)2 (b/2)2=a2. differentiate the equation and note thatdh=x
The differentiated equation for the triangle in the middle as per the Pythagorean rule appears to be as db = dl = -h/b dh = -h/bx
What can be said as The Pythagorean Theorem?The Pythagorean Theorem states that the squares on the hypotenuse (the side across from the right angle) of a right triangle, or, in familiar algebraic notation, a2 + b2, are equal to the squares on the legs.
Who made Pythagoras’s Theorem valid?Book I, Proposition 47, that is also known as I 47 or Euclid I 47, was mentioned and demonstrated for the first time by Euclid. Among all the Pythagorean proposition proofs, this one is arguably the most well-known.
By applying Pythagoras Theorem,
h^2/4 + b^2/4 = a^2
⇒ h^2 + b^2 = 4a^2
Then differentiating the equation, we have
2hdh + 2bdb = 0 (da = 0)
So db = dl = -h/b dh = -h/b x
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______ resources include biodiversity, energy, land and
soil, and water resources.
Answer : Natural
Explanation : Natural resources are the resources that are found in the environment and are developed without the intervention of humans
