If the subsolar point is moving from the equator towards the tropic of cancer, what season of the year is it?

The mean flow stress at the maximum load is 1047 MPa. The correct answer is A.

To find the mean flow stress at the maximum load, we need to find the maximum value of the true stress-true strain curve. This can be done by taking the derivative of the equation and setting it equal to zero:

dσ/dε = 1500(0.45)ε^(-0.55) = 0

Solving for ε, we find that the maximum value occurs at ε = (1500/0.45)^(1/0.55) = 29.27.

Plugging this value back into the original equation, we find the maximum stress:

σ = 1500(29.27)^0.45 = 1047 MPa

Therefore, at the maximum load, the mean flow stress is 1047 MPa, or answer choice A.

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Kettles heated on stoves are used to be made up of copper. This is because copper is a good conductor of heat and electricity.

Copper is used in making kettles. This is because copper is an excellent choice for a tea kettle as it is an excellent conductor of heat and electricity. This means that copper heats up quickly and evenly, making it ideal for the purpose of boiling water and preparing tea. Copper is also a durable material which can last for many years with proper care.

Copper kettles are polished from the outer surface as it is subject to corrosion that is caused by salts and sulfates. If the kettles are not cleaned completely, this corrosion, even as a slight film, will affect the taste of what is prepared in that copper kettle, giving a metallic sensation to taste.

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Answer:

-1.24 m/s

Explanation:

Total momentum before collision = total momentum after collision

Total momentum before collision = (mass of full back * velocity of fullback) + (mass of lineman * velocity of line man).

Mass of full back = 112 kg, mass of line bag = 120 kg, velocity of full back  6 m/s (east), velocity of line back = -8 m/s (west). Hence:

Total momentum before collision = (112 * 6) + (120 * -8) = 672 - 960 = -288 kgm/s

The total momentum after collision = (mass of full back + mass of line back) * velocity after collision.

Let velocity after collision be v, hence:

The total momentum after collision = (112 + 120)v = 232v

Total momentum before collision = total momentum after collision

-288 = 232v

v = -288 / 232

v = -1.24 m/s

Therefore after collision, the two players would move at a velocity 1.24 m/s west (the same direction as the lineman).

I'm pretty sure this poor guy could never have been accepted for astronaut training, much less a mission to the Moon.  

He weighs something like 335 pounds when he's ON THE MOON !

If he has enough fuel, and survives a trip back to Earth, he'll weigh around 9,080 Newtons here.  That's like 2,040 pounds ... durn close to a ton ! !

Answer:

Gravitational field strength:

Moon is 1.6N/kg

Earth is 9.8N/kg or 10N/kg

Moon:

Weight = mass x gravitational field

1500N = m x 1.6N/kg

÷1.6 both sides

937.5 = m

Mass of astronaut is 937.5kg

(Your mass doesn't change, no matter where you go, in space)

Earth:

Weight = mass x gravitational field

= 937.5kg x 9.8 N/kg

= 9187.5N

Or

Weight = mass x gravitational field

= 937.5kg x 10 N/kg

= 9375N

Thus, the astronaut's weight will be 9187.5N or 9375N on Earth.

Hope this helps!

ANSWER

EXPLANATION

Ice is the solid state of water - think about ice cubes you'd use to cool a soda, they are in solid state.

Water at room temperature is always liquid - remember that 'room temperature' is about 25°C.

Answer:

A

Explanation:

Answer:

Distance divided by time

Explanation:

The 6cm far away could another bumblebee detect its presence. An electric field of 60 n/c.

The positive charge at the dot produces an electric field that is directed away from the positive charge. The negative charge at the dot is the target of the electric field that it produces.

The field strength in physics refers to the size of a vector-valued field, such as the electric field E's magnitude expressed in volts per meter, or V/m. For instance, an electromagnetic field produces both a strong electric field and a strong magnetic field.

Given:

Electric field E = 60 N/C

Charge q = 24 pC

Electric field \(E=K\frac{q}{r^2}\)

\(r=\sqrt{K\frac{q}{E} }\)

\(K=8.99*10^9\frac{Nm^2}{C^2}\)

\(r=\sqrt{(8.99*10^9)\frac{24*10^-12}{60} }\)

\(r=6cm\)

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The R-squared value of 0.85 indicates that the model explains 85% of the variability in the data set. Therefore, the linear model is a good fit for this data set.

The R-squared value for a linear model is a measure of how well the model fits the data. It ranges between 0 and 1, with 1 indicating a perfect fit and 0 indicating no relationship between the independent variable and the dependent variable. A high R-squared value means that the model fits the data well.

The R-squared value of 0.85 indicates that the linear model is a good fit for the data. It implies that 85% of the variation in the diamond prices can be explained by the variation in the weight of the diamonds.

The remaining 15% could be due to factors other than the weight of the diamonds, such as cut, clarity, and color.

Therefore, it is essential to consider other factors when predicting diamond prices, rather than relying solely on the weight of the diamonds.

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Answer:

c

Explanation:

The correct statement is: "The vibrations of the fields are perpendicular to the direction of motion of the wave."

To find the correct statement among all the options, we need to know more about the Electromagnetic wave.

What is electromagnetic wave?

How does the electromagnetic wave travel?

Thus we can conclude that the option (C) is correct.

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When the core temperature rises, stars start burning helium to carbon. This rise in temperature is brought on by. creating helium by fusing hydrogen in a shell.

When carbon and helium are combined, oxygen is created. Helium burns to create carbon. The star's surface temperature rises as it develops into a horizontal branch star as its core becomes rich in carbon and oxygen nuclei. When their brilliance remains constant, stars with masses larger than or equal to the Sun shrink and get hotter.

When it becomes heated enough, hydrogen in a shell outside the core can begin to fuse. The exterior is expanding.

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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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The acceleration of the block is 6.4 m/s².

To calculate the acceleration of the block, we need to consider the forces acting on it.

The applied force is 40 N, and since it is the only horizontal force in the direction of motion, it is the net force acting on the block.

The frictional force opposing the motion is 8 N.

The acceleration, we can use Newton's second law, which states that the net force acting on an object is equal to its mass multiplied by its acceleration (F = ma).

The net force is the difference between the applied force and the frictional force:

40 N - 8 N = 32 N.

Now, we can plug the values into Newton's second law:

32 N = 5 kg × a.

Solving for the acceleration (a), we get

a = 32 N / 5 kg

a = 6.4 m/s².

Therefore, the acceleration of the block is 6.4 m/s².

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Answer:

Mechanical Waves

Explanation:Sound waves in air are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves.

Answer:

Mechanical Wave

Explanation:

Sound is an example of a Mechanical Wave.

The wave with the longest wavelength in the electromagnetic spectrum is a radio wave. Radio waves have the longest wavelength and the lowest frequency of all electromagnetic waves. They are used for broadcasting radio and television signals, as well as for communication purposes such as mobile phones and walkie-talkies.

The electromagnetic spectrum consists of various types of waves, each with different wavelengths and frequencies. As the wavelength decreases, the frequency of the wave increases, and the energy carried by the wave increases. After radio waves, the electromagnetic spectrum includes microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

The properties of electromagnetic waves make them versatile and useful in various fields, such as communication, medicine, and astronomy. They can travel through a vacuum, at the speed of light, and their energy can be absorbed or emitted by matter. This makes them useful for studying the properties of matter and the universe, as well as for transmitting information over long distances.

In conclusion, radio waves have the longest wavelength in the electromagnetic spectrum, and they are widely used for communication and broadcasting purposes. The electromagnetic spectrum is a valuable tool for scientists and engineers, allowing them to study and utilize the properties of electromagnetic waves for a variety of applications.

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Answer:

Explanation:

mass (m) = 50 kg

Force (F) = 200 N

Acceleration (a)= ?

WE know

F = m * a

200 = 50 * a

a = 200 / 50

a = 4 m/s²

Hope it will help :)

If the angle of incidence is 30°, the value of the angle of reflection is also 30°.

The law of reflection states that the angle of incidence is equal to the angle of reflection, i.e.,θi=θrwhere θi is the angle of incidence and θr is the angle of reflection. It is valid for both light and sound waves. When a wave encounters a boundary between two media, it undergoes reflection, refraction, absorption, or transmission, depending on the properties of the media involved. If the angle of incidence is 30°, then the angle of reflection is also 30°. This statement is derived from the law of reflection, which states that the angle of incidence is equal to the angle of reflection. It is valid for both light and sound waves.

According to the law of reflection, when a wave encounters a boundary between two media, it undergoes reflection, refraction, absorption, or transmission, depending on the properties of the media involved. When a wave reflects from a surface, it changes direction in such a way that the angle of incidence is equal to the angle of reflection. The incident and reflected rays lie in the same plane that is perpendicular to the surface of the boundary.The law of reflection is valid for both light and sound waves. For instance, when a light wave strikes a plane mirror, it is reflected back to the observer with the same angle as that of incidence. Similarly, when a sound wave strikes a wall, it reflects back with the same angle as that of incidence. Therefore, the law of reflection is a fundamental principle of wave propagation that governs the behavior of waves at boundaries.

The value of the angle of reflection is equal to the angle of incidence, i.e., θi=θr. When a wave encounters a boundary between two media, it undergoes reflection, refraction, absorption, or transmission, depending on the properties of the media involved. The law of reflection is valid for both light and sound waves and is a fundamental principle of wave propagation that governs the behavior of waves at boundaries.

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The pressure exerted on the stone is \(500000 N/m^2.\)

What is pressure?

Formula for pressure = Force / area

\(=50/1.0 X 10^4\\ =500000N/m^2.\)

The required answer is \(500000 N/m^2.\)

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If the mass of earth is 5.98 x 10 ^24 Then magnitude of the earths acceleration towards the apple 6.56 * 10^(-25) m/s²

A key concept in science is the concept of magnitude in physics. The general quantity or distance is referred to as magnitude. When it comes to the elements of movement, we can tie magnitude to an object's size and motion speed.

A particular object's magnitude is determined by its size or quantity. For instance, when it comes to speed, if a car is moving at a quicker rate than a nearby motorcycle, the magnitude of the automobile's speed is greater than the speed of the motorcycle. Although they contain directions as well as magnitude, vector quantities. Vector quantities include things like force, acceleration, speed, velocity, and many others. A vector's absolute value is referred to as its magnitude.

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As we move from left to right across the periodic table, the general trend is that the atomic radii decrease and the electronegativity increases while the metallic character decreases and the nuclear shielding remains constant. The option d is correct

The periodic table is an organized arrangement of elements that are ordered according to the periodic law, which is a basic principle of chemistry. This principle explains that the chemical and physical properties of elements are periodic or repeated based on their atomic structure. The table has been designed to demonstrate the relationship between the chemical and physical properties of elements. It comprises 118 elements in total and is arranged in order of atomic number. Elements have been classified into groups based on their chemical and physical properties. Each group is identified by the number of valence electrons the element has, which plays a significant role in determining the element's behavior.  

As we move from left to right across the periodic table, the trend is that the atomic radii decrease due to the increased nuclear charge that attracts the electrons more strongly to the nucleus. This decreases the size of the atom. Additionally, the electronegativity increases because the effective nuclear charge, which is the net charge an electron feels from the nucleus, increases. The metallic character of the element decreases as we move from left to right because the elements lose their metallic character and become non-metallic. Finally, nuclear shielding remains constant because it remains the same across a period. The option d is correct

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Answer:

i) Power = Force * Velocity = 1100 * 15 = 16500 W = 16.5 kW(ii)  Find the value of k first: F = 400 + k(15^2)                                              k = 28/9    F = 400 +(28/9)(30^2) = 320

Explanation:

Answer:

Neil Armstrong

Explanation:

Answer:

Neil Armstrong.

Explanation:

. PLEASE GIVE BRAINLIEST.

Answer:

sound requires a medium to be propagated

Explanation:

sound is a mechanical wave and thus requires a medium to be propagated.  Air this case is a medium of travel for the ringing bell in the chamber that is why sound can be heard. When air in the chamber it becomes a vacuum that is why sound is not heard

Both given statements are true. An atom has a nucleus, an electron cloud, and subatomic particles.

There are two main parts of an atom i.e. nucleus (protons + neutrons) and the electron cloud which is composed of three subatomic particles: electrons, protons, and neutrons.

An electron is a subatomic particle having a negative charge on it.

While protons are positively charged particles and are found in the nucleus of an atom due to strong nuclear forces.

On the other hand, a neutron, as the name suggests, is a neutral subatomic particle having no charge at all.

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Answer:

Conduction

Explanation:

Because when a molecule is transferred to another molecule then this in going into direct contact

For example if we have a pan and it is boiling well the heat that is on the pan holder that stays in place and it won`t move anywhere else like there is Radiation and Convection but for this question the answer would be Conduction

Weight of the second body is 320n.

Weight of a body is calculated as the force with which it is attracted  by the earth. It is calculated as the product of mass and acceleration due to gravity.

Weight is a vector quantity as it is a force. Its S.I. unit is newton (N).

Weight of two bodies are balanced.

So, Weight of body 1 with mass 40 n = weight of body of unknown mass

                40 × 10×  0.8 = x × 0.1 × 10

Where acceleration due to gravity g = 10

So, x = 40 ×0.8/0.1

          = 320 n

we knew that weight of the second body is 320 n.

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The height of the hill, given the radius and mass of the Earth can be found to be 2.5 km.

We can use the conservation of energy to solve this problem. The potential energy of the stone at the top of the hill is equal to its gravitational potential energy, which is given by:

PE = mgh

Solving for height , we get:

h = (G x M x m) / (R x m x g)

h = (6.67 x 10^-11 x 6 x 10^24 x 40) / ((6.4 x 10^6 + h) x 9.8)

h = 2.5 km

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The solution to the system of equations  sing Gauss elimination is (x, y) = (-1/3, -12).

we will  apply row operations to transform the augmented matrix into row-echelon form.

The system of equations is:

-9x + 3y = 3

y = -12

The augmented matrix form is :

[ -9 3 | 3 ]

[ 0 1 | -12 ]

We will then Swap rows R1 and R2:

[ 0 1 | -12 ]

[ -9 3 | 3 ]

We wil multiply R2 by -9:

[ 0 1 | -12 ]

[ 81 -27 | -27 ]

we also add 9*R2 to R1:

[ 81 -27 | -27 ]

[ 0 1 | -12 ]

We then Divide R1 by 81:

[ 1 -1/3 | -1/3 ]

[ 0 1 | -12 ]

x = -1/3

y = -12

In conclusion, we have obtained the row-echelon form.

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The Sun's power density is spread over a much larger surface area and it radiates a tremendous amount of energy due to its high temperature and mass compared to an individual human body.

(a) To determine the wavelength at which the black body emission from the human body peaks, we can use Wien's displacement law. According to the law, the peak wavelength (λ_max) is inversely proportional to the temperature of the black body. The average surface temperature of the human body is approximately 37°C, which is equivalent to 310 K. Using the equation λ_max = b/T, where b is Wien's displacement constant (approximately 2.898 × 10^−3 m·K), we can calculate the peak wavelength:

λ_max = (2.898 × 10^−3 m·K) / 310 K

λ_max ≈ 9.35 × 10^−6 m

λ_max ≈ 9,350 nm

Therefore, the black body emission from the human body peaks at a wavelength of approximately 9,350 nano meters (in the infrared range).

(b) To estimate the surface area of the human body, we can approximate it as a cylinder. Assuming an average height of 1.7 meters and an average radius of 0.3 meters, the surface area can be calculated using the formula for the lateral surface area of a cylinder:

Surface area = 2πrh + πr^2

Surface area ≈ 2π(0.3 m)(1.7 m) + π(0.3 m)^2

Surface area ≈ 3.38 m^2

To calculate the luminosity, we can use the Stefan-Boltzmann law, which states that the power radiated by a black body is proportional to its surface area (A) and the fourth power of its temperature (T):

Luminosity = σAT^4

where σ is the Stefan-Boltzmann constant (approximately 5.67 × 10^−8 W/m^2·K^4). Assuming a typical skin temperature of 33°C (306 K), we can calculate the luminosity:

Luminosity = (5.67 × 10^−8 W/m^2·K^4)(3.38 m^2)(306 K)^4

Luminosity ≈ 420 W

Therefore, the estimated luminosity of the human body is approximately 420 Watts.

(c) The mass of the Sun is about 2 × 10^30 kilograms. If the Sun were made of people (by mass), we can assume the same luminosity as calculated in part (b) per unit mass. Therefore, the luminosity of the Sun made of people would be:

Luminosity of the Sun = (420 W/kg)(2 × 10^30 kg)

Luminosity of the Sun ≈ 8.4 × 10^32 W

Comparing the power densities, the power density of the Sun is significantly greater than that of the human body since the Sun's luminosity is several orders of magnitude higher. The Sun's power density is spread over a much larger surface area and it radiates a tremendous amount of energy due to its high temperature and mass compared to an individual human body.

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