5. A certain dog whistle has a frequency of 35. 1 kHz. A person blows the whistle while riding in the back of a "convertible" airplane with a velocity of 126 m/s, north. With what minimum velocity must a person in a second airplane fly in order for the sound to be shifted into the audible frequency range? (speed of sound in air is 343 m/s)

Yes, clay is an important material for building due to its specific properties. the unique properties of clay make it an important material in construction, providing structural stability, thermal comfort, and moisture regulation to buildings. Clay possesses several characteristics that make it suitable for construction purposes:

Plasticity: Clay exhibits plasticity, which means it can be easily molded and shaped when wet. This property allows for the formation of various construction elements such as bricks, tiles, and sculptures. Cohesion: Clay particles have a strong tendency to stick together, providing cohesiveness and stability to structures made from clay. This cohesion enables the formation of solid and durable clay structures. Low shrinkage: Clay has low shrinkage properties, which means it experiences minimal dimensional changes during the drying and firing process. This quality is crucial for maintaining the structural integrity of clay-based constructions. Clay has excellent thermal insulation properties, making it suitable for creating buildings that provide natural temperature regulation. Clay structures can keep interiors cool in hot climates and retain warmth in colder regions. Moisture regulation: Clay has the ability to absorb and release moisture, allowing it to regulate humidity levels in buildings. This property contributes to a comfortable indoor environment and helps prevent issues such as condensation and mold growth.

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Sound is transmitted through gases, plasma or blood, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.

For example, when you flick the rim of a glass, the glass will vibrate imperceptibly. These vibrations move through the air and strike the ear drum of anyone within hearing range (click here to find out 'How Our Ears Hear'). In fact, these vibrations, or sound waves, can move through any medium: gas, liquid or solid.

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The direction of the magnetic field at the proton's location at this moment in time is out of the page (Option C). This is because the electromagnetic wave consists of oscillating electric and magnetic fields, and the direction of the magnetic field is perpendicular to the direction of the electric field.

As the proton is feeling an upward electric force, the magnetic field should be perpendicular to this force and hence out of the page.

An electromagnetic wave is passing through space, and a proton is present at a particular location. At this moment in time, the proton is experiencing an upward electric force due to the passing electromagnetic wave. To determine the direction of the magnetic field at the proton's location, we need to consider the relationship between the electric and magnetic fields. The magnetic field is perpendicular to the electric field, and as the proton is feeling an upward electric force, the magnetic field should be perpendicular to this force and out of the page. Therefore, the correct option is C, out of the page.

In conclusion, when a proton is feeling an upward electric force due to the passing electromagnetic wave, the direction of the magnetic field at its location is out of the page. This is because the magnetic field is perpendicular to the electric field, and in this case, it should be perpendicular to the upward electric force experienced by the proton.

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A scientist is studying how the temperature of a baseball affects how far it goes when hit by a bat. The scientist aims to make the experiment as repeatable as possible by following specific procedures that will allow for consistency and accuracy. The following steps will make the experiment more repeatable:

1. Standardization of the equipment: The scientist must ensure that the equipment used in the experiment is standardized. They should use the same type of bat, ball, and equipment for every trial to make the experiment as repeatable as possible.

2. Standardization of the environment: The scientist must maintain a standard environment for the experiment. The temperature, humidity, and atmospheric pressure must be the same for every trial.

3. Randomization: The scientist should randomly choose the order of trials to eliminate any potential biases.

4. Multiple Trials: The scientist should repeat the experiment multiple times to obtain accurate and consistent results. This will help to identify any anomalies or errors.

5. Record Keeping: The scientist must maintain accurate records of all the data collected from the experiment. They should record the date, time, and temperature of the ball and any other relevant information that can help to repeat the experiment.

6. Data Analysis: The scientist should analyze the data obtained from the experiment using statistical methods to identify any trends or patterns.

By following these steps, the scientist can make the experiment more repeatable and achieve accurate and consistent results.

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1. The Schrödinger equation is a fundamental equation in quantum mechanics that describes the behavior of particles. The general solution represents the wave function of a particle and provides information about its position and momentum.

3.Tunneling is a phenomenon in quantum mechanics where a particle can pass through a potential barrier even though it does not have enough energy to overcome the barrier classically.

1. The Schrödinger equation is a partial differential equation that was developed by Erwin Schrödinger in 1925 as a mathematical formulation of quantum mechanics. It describes how the wave function of a particle evolves over time. The equation takes the form:

Ĥψ = Eψ

Where Ĥ is the Hamiltonian operator, ψ is the wave function, E is the energy of the particle, and Ĥψ represents the operation of the Hamiltonian on the wave function.

The general solution to the Schrödinger equation represents the wave function of a particle. The wave function provides information about the probability distribution of the particle's position and momentum. It contains both real and imaginary components and is typically represented as a complex-valued function.

The wave function, ψ, can be written as a product of a spatial part and a temporal part:

ψ(x, t) = Ψ(x) * Φ(t)

The spatial part, Ψ(x), represents the probability amplitude of finding the particle at position x, while the temporal part, Φ(t), describes how the wave function evolves over time.

The Schrödinger equation and its general solution are essential tools in quantum mechanics, as they allow us to predict the behavior of particles on a microscopic scale. By solving the equation, we can determine the wave function of a particle and calculate probabilities associated with its position and momentum.

2.Case 1: Particle in a Box

In the case of a particle confined to a one-dimensional box, the potential energy is zero within the box and infinite outside of it. This situation can be represented by the following potential function:

V(x) = 0,  0 < x < L

V(x) = ∞,  x ≤ 0 or x ≥ L

To solve the Schrödinger equation for this case, we need to find the wave function (Ψ) and the corresponding energy levels (E). The general form of the wave function inside the box is given by:

Ψ(x) = A * sin(kx)

Where A is a normalization constant, and k = (2π/L).

Applying the boundary conditions, we find that the wave function must go to zero at both ends of the box (x = 0 and x = L). This leads to the quantization of the wave vector k:

k = nπ/L,  where n = 1, 2, 3, ...

The corresponding energy levels are given by:

E = (ħ²π²/2mL²) * n²

Where ħ is the reduced Planck's constant and m is the mass of the particle.

Case 2: Harmonic Oscillator

In the case of a particle in a harmonic oscillator potential, the potential energy can be described by:

V(x) = (1/2)kx²

Where k is the spring constant. To solve the Schrödinger equation for this potential, we use the harmonic oscillator equation:

- (ħ²/2m) * (d²Ψ/dx²) + (1/2)kx²Ψ = EΨ

The solutions to this equation are given by Hermite polynomials, and the corresponding energy levels are quantized. The wave function for the harmonic oscillator potential can be expressed as a product of a Gaussian function and a Hermite polynomial:

Ψ(x) = (A/π)\(^{(1/4)\) * exp(-αx²/2) * Hₙ(√αx)

Where A is a normalization constant, α = (√(mk/ħ)), and Hₙ is the Hermite polynomial of degree n.

The energy levels in the harmonic oscillator potential are given by:

E = (n + 1/2)ħω

Where n = 0, 1, 2, ... and ω = (√(k/m)) is the angular frequency of the oscillator.

These solutions provide insights into the behavior of electrons traveling in these potential systems, including the quantization of energy levels and the spatial distribution of the wave functions.

3. Tunneling is a phenomenon in quantum mechanics where a particle can pass through a potential barrier even though it does not have enough energy to overcome the barrier classically. This effect arises from the wave nature of particles, as described by the Schrödinger equation.

Tunneling has important implications in various areas of physics, such as nuclear fusion, quantum computing, and scanning tunneling microscopy. It allows for phenomena such as alpha decay, where alpha particles escape from atomic nuclei, and the operation of tunneling diodes in electronic devices.

Overall, tunneling is a fascinating quantum mechanical phenomenon that challenges our classical intuition and plays a crucial role in understanding the behavior of particles in the presence of potential barriers.

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The maximum distance the t-shirt can be fired is approximately 23 meters.

To determine the maximum distance a t-shirt can be fired from a t-shirt gun with an initial speed of 15 m/s, we need to consider the projectile motion of the t-shirt.

Assuming no air resistance, we can use the range formula for projectile motion:

Range = \((initial velocity^2 * sin(2*theta)) / g\)

Where:

initial velocity is the initial speed of the t-shirt (15 m/s)

theta is the launch angle (assume it is 45 degrees for maximum range)

g is the acceleration due to gravity (approximately 9.8 m/s^2)

Plugging in the values:

Range = \((15^2 * sin(2*45)) / 9.8\)

Range = (225 * sin(90)) / 9.8

Range = (225 * 1) / 9.8

Range ≈ 22.96 m

Rounded to the nearest whole number, the maximum distance the t-shirt can be fired is approximately 23 meters.

Therefore, the correct answer is option a. 23 m.

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Answer:

the fast carbon cycle follows the movement of carbon through living (biotic) components of an ecosystem. This occurs faster because life moves more quickly. The fast carbon cycle focuses primarily on the biosphere, while the slow carbon cycle is more involved with the hydrosphere, lithosphere and atmosphere.

Explanation:

ANSWER

False

EXPLANATION

We want to know if the image produced by a convex lens is always real.

A convex lens can form real images but it can also form virtual images. This will only occur when the object is placed in between the focus and optical center of the lens.

In this case, the image is erect and enlarged and magnification is always greater than 1.

The answer is false.

Since, ABCDEF is a regular hexagon,

The measure of the central angle of a regular polygon = \(\frac{360}{n}\)

where n = number of sides of the polygon

The measure of the central angle of a regular hexagon =\(\frac{360}{6}\) = 60°

That means when we rotate a regular hexagon by an angle in the multiple of 60°, the hexagon overlaps itself.

Therefore, by the rotation of 240° clockwise, point C will replace the position of point A.

The image of hexagon ABCDEF will become CDEFAB.

A rotation matrix is a transformation matrix in linear algebra that is used to make a rotation in Euclidean space. Rotation matrices depict rotations about the origin since matrix multiplication has no effect on the zero vector (the coordinates of the origin). Rotation matrices provide an algebraic description of such rotations and are widely utilized in geometry, physics, and computer graphics computations. In some publications, the term rotation is broadened to cover improper rotations, which are defined by orthogonal matrices with determinants of 1 (rather than +1). These incorporate appropriate rotations and reflections (which invert orientation). In other circumstances, where reflections are not taken into account, the label proper may be omitted. This article adheres to the later convention.

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At t = 2.1 s, the velocity of the slider is 0.392 m/s in the x-direction and -0.371 m/s in the y-direction, and the acceleration of the slider is -0.544 m/s² in the x-direction and -0.192 m/s² in the y-direction.

To determine the velocity and acceleration of the slider, we need to find its position as a function of time

To calculate the velocity and acceleration of the slider at t = 2.1 s:

1. Velocity calculation:

- x-component velocity (vₓ) = -0.18 m/s

- y-component velocity (vᵧ) = (0.66 - 0.062 * 2.1) * 1.47 m/s

= -0.371 m/s

2. Acceleration calculation:

To determine the acceleration, we differentiate the velocity function with respect to time. The x-component of acceleration (aₓ) is the derivative of vₓ with respect to t, which gives aₓ = 0 m/s². The y-component of acceleration (aᵧ) is obtained by differentiating vᵧ with respect to time and multiplying it by the radial distance r.

- x-component acceleration (aₓ) = 0 m/s²

- y-component acceleration (aᵧ) = -0.062 * 1.47 m/s²

= -0.091 m/s²

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The height of the image will be 0.32 cm and 0.3328 cm, respectively, and the image will be inverted in both cases.

To answer this question, we need to use the thin lens equation, which relates the distance of an object from a lens to the distance of its image from the lens and the focal length of the lens. The equation is:

1/f = 1/d_o + 1/d_i

where f is the focal length, d_o is the distance of the object from the lens, and d_i is the distance of the image from the lens.

First, let's find the size of the image of the candle flame on the wall without the lens. We can use similar triangles to find that the height of the image is:

h_i = h_o * (d_i / d_o)

where h_o is the height of the object (the candle flame), which is 2.0 cm, and d_i is the distance of the image from the wall, which is 2.0 m. The distance of the object from the wall is the same as the distance of the image from the wall, so d_o = 2.0 m. Plugging in these values, we get:

h_i = 2.0 cm * (2.0 m / 2.0 m) = 2.0 cm

So the image of the candle flame on the wall without the lens is also 2.0 cm tall.

Now, let's consider the lens. We want to find the places where we can put the lens to form a well-focused image of the candle flame on the wall. A well-focused image is one where the image is sharp and clear, and the height and orientation of the image are similar to the object.

To find the places where we can put the lens to form a well-focused image, we need to solve the thin lens equation for d_i for various values of d_o, which will give us the distances of the image from the lens for different positions of the lens. We can then use the equation for the height of the image to find the height and orientation of the image for each position of the lens.

Let's start by solving the thin lens equation for d_i when d_o = infinity. This corresponds to the case where the lens is very far away from the candle flame, so we can treat the light rays from the candle flame as parallel. The thin lens equation becomes:

1/f = 1/d_i

Solving for d_i, we get:

d_i = f

Plugging in f = 32 cm, we get:

d_i = 32 cm

This means that if we place the lens 32 cm away from the candle flame, we will get a well-focused image of the candle flame on the wall. The distance of the image from the lens will be the same as the focal length of the lens, which is 32 cm. The height of the image will be:

h_i = h_o * (d_i / d_o) = 2.0 cm * (32 cm / 200 cm) = 0.32 cm

So the image will be much smaller than the object, and it will be inverted (upside down) because the object is closer to the lens than the focal point.

Now, let's solve the thin lens equation for d_i when d_o = 2.0 m. This corresponds to the case where the lens is right next to the candle flame, so the light rays from the candle flame are converging toward the lens. The thin lens equation becomes:

1/f = 1/d_o + 1/d_i

Plugging in f = 32 cm, d_o = 2.0 m, and solving for d_i, we get:

d_i = 33.28 cm

This means that if we place the lens 33.28 cm away from the candle flame, we will get a well-focused image of the candle flame on the wall. The height of the image will be:

h_i = h_o * (d_i / d_o) = 2.0 cm * (33.28 cm / 200 cm) = 0.3328 cm

So the image will be slightly smaller than the object, and it will be inverted (upside down) because the object is closer to the lens than the focal point.

We can put the lens in two places to form a well-focused image of the candle flame on the wall: 32 cm away from the candle flame, and 33.28 cm away from the candle flame. The height of the image will be 0.32 cm and 0.3328 cm, respectively, and the image will be inverted in both cases.

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Answer:

40m

Explanation:

Your total displacement would be 40m! Let me explain.

Going 30m north adds 30 to 0... so your total right now is 30m.

if you turn around and walk 10 m you have to add that 10 to the 30.

so your total displacement is 40m.

Option b) sets an upper limit to the amount of energy  that can be absorbed or emitted is the correct choice for Planck's constant.

Planck's constant, denoted by h, is a fundamental constant in quantum mechanics. It relates the energy of a photon or a quantum of electromagnetic radiation to its frequency. According to the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency, Planck's constant determines the proportionality between energy and frequency.

Option a) relates mass to energy is incorrect because that relation is described by Einstein's famous equation, E = mc², where E is energy, m is mass, and c is the speed of light.

Option c) sets a lower limit to the amount of energy that can be absorbed or emitted is also incorrect. Planck's constant does not impose a lower limit on energy but rather quantizes energy, meaning it can only exist in discrete packets or "quanta."

Option d) relates mass to velocity is unrelated to Planck's constant and is not a correct description.

Therefore, option b) sets an upper limit to the amount of energy that can be absorbed or emitted is the accurate characterization of Planck's constant.

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Answer:

ANION is the answer

The description of the nature of image formed 2nd if the object X distance from the pole of mirror then find image distance from the pole 3rd if the radius of curvature of mirror is are then write the relation between object distance image distance and focal length of the mirror give one use of concave mirror is given below

A concave mirror is a mirror with a curved, inwardly facing surface. When an object is placed in front of a concave mirror, the mirror will form an image of the object. The nature of the image formed depends on the position of the object relative to the mirror.

To find the image distance from the pole of the mirror, you can use the mirror equation:

1/image distance + 1/object distance

= 1/focal length.

If the object is X distance from the pole of the mirror, you can substitute this value for the object distance in the mirror equation to find the image distance.

The relationship between the object distance, image distance, and focal length of a concave mirror can be expressed using the mirror equation:

1/image distance + 1/object distance

= 1/focal length.

This equation tells us that the sum of the reciprocals of the object distance and image distance is equal to the reciprocal of the focal length.

Therefore, One use of a concave mirror is as a reflector in a flashlight or car headlight. The concave mirror focuses the light to a point in front of the mirror, creating a bright beam of light that can be directed at a specific location.

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Answer: B) 42

Explanation: You can see that it's the lowest number out of the 4 answers.

The implied annualized risk-free rate of return for holding the futures contract is approximately 8.51%.

In this scenario, the futures price of the ABC index is higher than the spot price, indicating a positive cost of carry. To calculate the implied annualized risk-free rate of return, we can use the formula:

Implied Annualized Risk-free Rate = (Futures Price - Spot Price) / Spot Price * (365 / Time to Expiration)

Given the spot price of 1302, the futures price of 1335, and a 6-month expiration period, we can plug these values into the formula:

Implied Annualized Risk-free Rate = (1335 - 1302) / 1302 * (365 / 0.5)

Calculating the expression yields approximately 0.0851 or 8.51%. This implies that holding the futures contract on the ABC index would yield an annualized risk-free return of 8.51% if the current market conditions persist.

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The above given question is incomplete, below a complete question is written:

The (hypothetical) ABC index spot price is currently at 1302, and the continuously compounded risk-free rate is 6% per annum. The 6-month observed futures price on the index is 1335. What is the implied annualized risk-free rate of return for holding the futures contract?

Net force on the image is 0 Newton.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Net upward force is balanced by net downward force so net force is zero.

Net force on the image is 0 Newton.

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Answer:

c) affects

Explanation:

im like 90% sure

Answer:

FN is the forces acting on a body. When the body is at rest, the net force formula is given by, FNet = Fa + Fg.

Im in 7th and thats all I know so I hope it's enough

Evolution, is a process that results in changes in the genetic material of a population over time.

Answer:

Explanation:

To solve this problem, we can use the equation for the centripetal force experienced by a charged particle moving in a magnetic field:

F = (mv^2) / r

where:

F is the centripetal force,

m is the mass of the electron,

v is the velocity of the electron,

r is the radius of the circular path.

We also know that the centripetal force is provided by the magnetic force:

F = |q| * v * B

where:

|q| is the magnitude of the charge of the electron,

B is the magnitude of the magnetic field.

Setting the two equations equal to each other and solving for the radius (r), we have:

(mv^2) / r = |q| * v * B

Simplifying and rearranging for r:

r = (mv) / (|q| * B)

Given:

m = 9.11 x 10^-31 kg (mass of the electron)

v = 1.26 x 10^7 m/s (velocity of the electron)

|q| = 1.6 x 10^-19 C (charge of the electron)

B = 1.90 x 10^-3 T (magnetic field)

(a) Calculating the radius (r):

r = (9.11 x 10^-31 kg * 1.26 x 10^7 m/s) / (1.6 x 10^-19 C * 1.90 x 10^-3 T)

r ≈ 0.00296 m

Converting the radius to centimeters:

r = 0.00296 m * 100 cm/m

r ≈ 0.296 cm

The radius of the circular path is approximately 0.296 cm.

(b) To find the time it takes for the electron to complete one revolution, we can use the equation for the period (T) of circular motion:

T = 2πr / v

Given the radius (r) and velocity (v), we can calculate T:

T = (2π * 0.00296 m) / (1.26 x 10^7 m/s)

T ≈ 1.48 x 10^-7 s

The time it takes for the electron to complete one revolution is approximately 1.48 x 10^-7 s.

Given that An electron moves in a circular path with a speed of 1.26 ✕ 10^7 m/s in the presence of a uniform magnetic field with a magnitude of 1.90 mT. The electron's path is perpendicular to the field. The task is to find the radius (in cm) of the circular path and how long (in s) it takes the electron to complete one revolution.

(a) To calculate the radius of the circular path, we need to use the formula that is used to find the radius of the circular motion under the influence of a magnetic field.

The seismic magnitude scale is used to describe the overall strength or "size" of an earthquake. It is distinguished from the seismic intensity scale which categorizes the intensity or severity of ground shaking caused by earthquakes at a specific location.

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A coin is sitting on a vinyl lp. if the coefficient of static friction is 0.57, The fastest rate of rotation with which the vinyl LP can rotate without slipping off the edge is 0.033 m/s.

This is because the static friction force Fs is related to the normal force Fn and the coefficient of static friction μs by the equation:


Fs = μs * Fn

Given that the coefficient of static friction is 0.57, the static friction force Fs is equal to 0.57 * the normal force Fn.


The normal force Fn is equal to the mass of the coin times gravity, Fn = mg.


Therefore, the static friction force Fs is equal to 0.57mg.


The maximum torque Tmax is equal to the static friction force Fs times the radius of the vinyl LP r, or Tmax = Fs * r.


Therefore, the maximum torque Tmax is equal to 0.57mg * r.


The angular velocity ω is equal to the maximum torque Tmax divided by the moment of inertia I, or ω = Tmax / I.


Therefore, the angular velocity ω is equal to 0.57mg * r / I.


Finally, the fastest rate of rotation with which the vinyl LP can rotate without slipping off the edge is equal to the angular velocity ω in m/s. Converting from radians per second to m/s yields 0.033 m/s.

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A 9.3 kilogram block is perched on an incline that slopes downward at a 27° angle from the horizontal. There is no resistance between the block and the incline for the first question. once there

What does the word "resistance" mean?

The obstruction to the flow of current through an electrical circuit is measured by resistance. A Greek letter omega () represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm (1784–1854), a German physicist that investigated the connection between voltage, current, and resistance, is the name given to the unit of resistance.

What is a circuit's electrical resistance?

The relationship between both the voltage applied and the current flowing thru a circuit determines its electrical resistance. Ohms is the symbol for electrical resistance. Some materials permit the flow of electric charge more easily than others. The electrical resistance gauges how much the circuit restricts the flow of this electrical charges.

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Answer:

20 m/s

Explanation:

Average Speed will equal to total distance over total time. We are given our total distance equal to 180 meters and total time as 9 seconds.

Apply the formula of speed:

\(\displaystyle{v=\dfrac{s}{t}}\)

where v is average speed, s is total distance and t is total time. Therefore:

\(\displaystyle{v=\dfrac{180}{9}}\\\\\displaystyle{v=20 \ \, \sf{m/s}}\)

Hence, the average speed for a soccer ball is 20 m/s.

Explanation:

R = \(\sqrt{(12.0)^{2} + (9.00)^{2}}\) = 15 UNIDADES

Answer:B

Explanation:

The statement that summarizes the paragraph is northern hemisphere has more daylight hours.

The Earth is part of the nine planet and it comprises of the equator, northern and southern hemisphere.

It is the most suitable place for living because it have water,oxygen and other gases that support life.

Therefore, The statement that summarizes the paragraph is northern hemisphere has more daylight hours.

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The maximum possible efficiency of an engine operating between the given two temperatures is 10.38%.

Maximum efficiency that is obtained when the heat engine is operating between two temperatures is called Carnot Efficiency.

The efficiency of heat engines generally increases with the operating temperature. Advanced structural materials that helps engines to operate at higher temperatures is an active area of research.

The efficiency of Carnot engine = 1

No engine has 100 % efficiency as per the Kelvin Planck statement. Sink temperature is always  less than the source temperature, therefore  of Carnot cycle efficiency becomes less than 100 %.

Given T1 = 35°C , T2= 3°C

Efficiency =( (T1 - T2)/T1) × 100

T1= 35+273 = 308 K

T2 = 3 +273= 276 K

Efficiency = ( 308 - 276)/308×100

=( 32×100)/308

Efficiency = 10.38 %

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Answer:

Carbon dating only works for objects that are younger than about 50,000 years, and most rocks of interest are older than that. ... Scientists can determine how long ago an organism died by measuring how much carbon-14 is left relative to the carbon-12.

Explanation:

Answer:

Through testing them on elements of different atomic number

Explanation:

Answer:

Inorganic.

Explanation:

The chemical change which describes the reactions of elements and compounds that, in general, do not involve carbon and typically take place in laboratories or industries is inorganic.

In Chemistry, an inorganic chemical reaction can be defined as a type of chemical reaction that occurs without a carbon-hydrogen bond.

On the other hand, organic chemistry deals with reaction that occur in the presence of carbon-hydrogen bonds such as hydrocarbons.