Identify scalar or vector quantity:

The football player was running 10 miles an hour towards the end zone.

Explanation:

1A. The visible light portion of the electromagnetic spectrum shows the rainbow of colors, with violet and blue having shorter wavelengths, and therefore higher energy. At the other end of the spectrum toward red, the wavelengths are longer and have lower energy.

so its option 2

2A. Atom and molecules

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The ice melts because Thermal energy from Jan’s hand is transferred to the ice.

Thermal energy is the energy due to temperature difference.

Thermal energy flows from hotter to colder bodies.

The ice Jan is holding melts because heat is transferred from his hands t the ice.

In conclusion, thermal energy flow causes melting.

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Answer:

its b

Explanation:

because the heat from your hand makes the ice melt!

According to the question the speed of the skater's hands is 528 m/min.

To calculate the speed of the skater's hands, we can use the formula:

Speed = Circumference * Revolutions per minute

Given that the skater's hands are 140 cm apart and she spins at 120 rpm, we need to calculate the circumference of the circle formed by her hands.

The circumference of a circle is given by the formula:

Circumference = 2 * π * radius.

In this case, the radius is half the distance between the skater's hands, which is 140 cm / 2 = 70 cm.

Converting the radius to meters, we have 70 cm = 0.7 m.

Now we can calculate the circumference:

Circumference = 2 * π * 0.7 m = 4.4 m (rounded to one decimal place).

Finally, we can calculate the speed of the skater's hands:

Speed = Circumference * Revolutions per minute

     = 4.4 m * 120 rpm

     = 528 m/min.

Therefore, the speed of the skater's hands is 528 m/min.

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Answer:

Explanation:

neautrons and protons

A collision that is fully elastic is one where there is no kinetic energy lost during the contact. In an inelastic collision, a proportion of the energy is converted into another kind of energy during the contact.

In elastic collisions, kinetic energy and momentum are both conserved. Consider two similar trolleys that are moving in the same direction at the same pace. With no loss of speed, they collide and bounce off one another. Since no power has been lost, this collision is fully elastic.

photo of A description of completely elastic collision

When a system's maximal quantity of kinetic energy is equal to zero, a relatively inelastic collision takes place.

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A collision that is fully elastic is one where there is no kinetic energy lost during the contact. In an inelastic collision, a proportion of the energy is converted into another kind of energy during the contact.

In elastic collisions, kinetic energy and momentum are both conserved. Consider two similar trolleys that are moving in the same direction at the same pace. With no loss of speed, they collide and bounce off one another. Since no power has been lost, this collision is fully elastic.

photo of A description of completely elastic collision

When a system's maximal quantity of kinetic energy is equal to zero, a relatively inelastic collision takes place.

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Answer:

It would spin ifintely

Explanation:

Answer: 4. Infrared radiation

Explanation: Both carbon dioxide and methane are excellent absorbers of heat. The heat energy causes the molecule of carbon dioxide and methane to vibrate. As a result of this, the molecules gives up the extra energy by emitting  infrared photon.

Therefore, the Evidence that supports the idea that increases in carbon dioxide and methane in Earth's atmosphere are major contributors to global warming is primarily based on the fact that carbon dioxide and methane are excellent absorbers of infrared radiation

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Electromagnetic radiation is a sort of energy emission. This has two components, electrical and magnetic components, as is clear from the name. The radiation is hence known as electromagnetic radiation. In Fig. 1.1, it is depicted. From a very low frequency of 3 Hz to a very high frequency of 300 EHz (1 EHz = 1018 Hz), this radiation has a wide frequency range. Table 1.1 lists the metric prefixes along with their symbols.

The magnetic and electric vectors are perpendicular to one another and to the path of propagation. In Fig. 1, this is depicted. 1. Depending on the frequency, this electromagnetic spectrum is separated into different section

 Wavelength and Frequency Relationship

Wavelength

According , a wavelength is the separation between two crests or troughs. It is described in the "electronic spectrum" in terms of nm. 1 nm = 10−9 m. Radiation's energy and wavelength are inversely related. In other words, energy increases when the wavelength lowers and decreases when the wavelength grows.

In the IR spectrum, wavenumber, which has the SI value of cm1, is used in place of or v.

 The relationship between frequency and wavelength

where is the wavenumber, is the wavelength, c is the speed of light, and is the frequency of the radiation.

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The transformation of Polaroid in recent years has been characterized by a shift from analog instant photography to embracing digital technologies and modernizing its product offerings. This transformation has allowed Polaroid to adapt to the changing market and cater to the needs and preferences of today's consumers.

In recent years, Polaroid has introduced a range of digital instant cameras that combine the nostalgic appeal of instant photography with the convenience and versatility of digital imaging. These cameras typically feature built-in printers that produce instant prints, capturing the essence of Polaroid's iconic instant photography experience. Additionally, Polaroid has embraced the smartphone era by developing products like the Polaroid Lab, which allows users to turn digital photos from their smartphones into classic Polaroid-style prints.

Furthermore, Polaroid has expanded its product lineup to include various accessories, such as portable printers and film formats compatible with both analog and digital devices. By embracing digital technologies while staying true to its instant photography heritage, Polaroid has successfully repositioned itself in the market, appealing to a new generation of photography enthusiasts seeking a blend of nostalgia and modern functionality.

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Fetch is the distance over which the wind blows over open water generating mechanical waves; option D

Waves are disturbance which occur in a substance or medium which project energy as they travel along a particular plane or direction.

There are two types of waves:

Mechanical waves are waves which involve the disturbances that occur in particulate matter and which require a material medium for their transmission.

Fetch is an area of ocean or lake surface over which the wind blows in a constant direction, thus generating waves.

In conclusion, mechanical waves require material media for transmission.

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Interstellar dust scatters and absorbs light from stars, causing them to appear redder and dimmer than they would without dust.

Interstellar dust is made up of tiny particles, ranging from a few molecules to a few micrometers in size, that are found throughout the interstellar medium. When light from a star passes through the dust, it can be scattered in many different directions or absorbed by the dust particles.

This causes the starlight to appear dimmer and redder than it would be without dust. The reddening occurs because dust scatters blue light more efficiently than red light, causing blue light to be preferentially absorbed.

The overall effect of interstellar dust is known as extinction, which can make it difficult for astronomers to observe and study distant stars and galaxies.

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The heat of the surroundings is  - 4482 J.

A calorimeter is a device in which that is no exchange of heat between the device and the environment. In other words, there could only be exchange of heat when the a substance has been put inside the calorimeter.

We know that in a calorimeter;

Heat of the surrounding =  Heat of the system

That implies that they are of the same magnitude but of opposite direction hence the heat of the system is - 4482 J.

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Answer:

(a) What is the wavelength of the whale's echolocation wave?

The specific heat capacity of the metal of mass 770 g which required 155 calories to raise its temperature by 10 kelvin is 0.02 Cal/gK

From the question given above, the following the following data were:

Mass of metal (M) = 770 g

Heat (Q) required = 155 calories

Change in temperature (ΔT) = 10 K

The specific heat capacity of metal can be obtained as illustrated below:

155 = 770 × C × 10

155 = 7700 × C

Divide both side by 7700

C = 155 / 7700

Therefore, the specific heat capacity of metal is 0.02 Cal/gK

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Answer:

Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure.

If an object is three-quarters submerged in water, it indicates that the buoyant force acting on the object is equal to the weight of the volume of water it displaces. In other words, the object's density is equal to the density of water.

The density of an object can be determined by comparing its weight to its volume. When an object is three-quarters submerged, it means that three-quarters of its volume is occupied by water. Since the object is in equilibrium (neither sinking nor floating), its density must be equal to the density of water for this balance to occur.

Therefore, the density of the object is the same as the density of water in this scenario.

Buoyant force is the upward force exerted by a fluid (such as water) on an immersed or floating object. It is equal to the weight of the fluid displaced by the object and opposes the force of gravity.

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According to Newton's Law of Cooling, the mathematical model that can be solved to find y(t), the temperature of the object after t hours, is y(t) = 3 + 17e^(-kt), where k is a constant that can be determined using the given information.

Given that the fridge is kept at a constant temperature of 3°C and the object cools from 20°C to 10°C in half an hour, the mathematical model y(t) = a + (b - a)e^(-kt) can be used, where a represents the temperature of the fridge (3°C), b represents the initial temperature of the object (20°C), and k is a constant that needs to be determined.

Newton's Law of Cooling states that the rate of change of temperature of an object is directly proportional to the difference between the object's temperature and the ambient temperature. In this case, the ambient temperature is 3°C. Based on the given information, we can set up the following equation:

dy/dt = k(b - y)

Where dy/dt represents the rate of change of temperature, k is a constant, b is the initial temperature of the object (20°C), and y is the temperature of the object at time t.

Integrating the equation, we get:

∫(1/(b - y)) dy = ∫k dt

This results in:

-ln|b - y| = kt + C

Simplifying further, we have:

ln|b - y| = -kt + C

Exponentiating both sides, we obtain:

|b - y| = e^(-kt + C)

Since e^C is a positive constant, we can rewrite the equation as:

b - y = Ae^(-kt)

Where A is a positive constant.

To determine the constant k, we can use the fact that the object cools from 20°C to 10°C in half an hour. Plugging in the values for t = 0.5 and y = 10, we have:

20 - 10 = Ae^(-0.5k)

10 = Ae^(-0.5k)

Solving for A, we find:

A = 10e^(0.5k)

Substituting this value of A back into the equation, we get:

b - y = (10e^(0.5k))e^(-kt)

Simplifying further, we obtain:

y(t) = b - (b - a)e^(-kt)

Since a represents the temperature of the fridge (3°C) and b represents the initial temperature of the object (20°C), the final mathematical model to find y(t), the temperature of the object after t hours, is given by:

y(t) = 3 + (20 - 3)e^(-kt)

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Answer:

Explanation:

Kinetic energy involves motion so something that is not moving has zero kinetic energy.

Potential energy does not involve motion and is based on position in a field like gravity and magnetic.

Given that,

The initial speed of a ball, u = 17.3 m/s

It is shot from the roof of a 52 m tall building, h = 52 m

It is required to find the distance from the base of the building the ball land. Let the distance be d.

Final velocity of the ball, v = 0 (when it lands)

We can use third equation of motion to find it.

\(v^2-u^2=2ad\)

a = -g

\(-u^2=-2gd\\\\d=\dfrac{u^2}{2g}\\\\d=\dfrac{(17.3)^2}{2\times 9.8}\\\\d=15.26\ m\)

So, it will land at a distance of 15.26 m.

Answer:

λ = 1.8 x 10⁻⁷ m = 180 nm

Explanation:

First we find the work function of tungsten by using the following formula:

∅ = hc/λmax

where,

∅ = work function = ?

h = Plank's Constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λmax = maximum wavelength for photoelectric emission = 230 nm

λmax = 2.3 x 10⁻⁷ m

Therefore,

∅ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(2.3 x 10⁻⁷ m)

∅ = 8.64 x 10⁻¹⁹ J

Now we convert Kinetic Energy of electron into Joules:

K.E = (1.5 eV)(1.6 x 10⁻¹⁹ J/1 eV)

K.E = 2.4 x 10⁻¹⁹ J

Now, we use Einstein's Photoelectric Equation:

Energy of Photon = ∅ + K.E

Therefore,

Energy of Photon = 8.64 x 10⁻¹⁹ J + 2.4 x 10⁻¹⁹ J

Energy of Photon = 11.04 x 10⁻¹⁹ J

but,

Energy of Photon = hc/λ

where,

λ = wavelength of light = ?

Therefore,

11.04 x 10⁻¹⁹ J = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/λ

λ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(11.04 x 10⁻¹⁹ J)

λ = 1.8 x 10⁻⁷ m = 180 nm

The equilibrium height to which the wire CD will rise is given by the expression h = μ₀I² / 2π λg

A region in which the force of magnetism acts is known as the magnetic field, and it surrounds magnetic materials or a moving electric charge. Moving magnetic dipoles and electric charges produce a magnetic field, which acts as a force field on other nearby magnetic dipoles and moving charges.

Magnetic field at a distance h produced by a current carrying wire

B = μ₀I/ 2πh

Magnetic force due to the present current carrying wire can be calculated by the formula

F = B I  L

And we also know that F = mg

On equating these mg = B I L

( μ₀I/ 2πh ) I = ( m/ I ) g = λg

thus we get the value of h as

h = μ₀I² / 2π λg

Thus, the equilibrium height to which the wire CD will rise is given by the expression h = μ₀I² / 2π λg .

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The buoyant force on the raft increases as a result of your weights, which completely submerges the wooden raft floating in the lake.

The Buoyant force describes the relative tendency of objects to float or to rise when submerged in a fluid, for example, a lake.  It can also refer to the power of a fluid to exert an upward force on a body placed in it.

Therefore, the buoyancy or buoyant force of the wooden raft increases when you and your friends exert enough force on it, thereby completely submerging it in the lake at that moment.

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The property of a system that enables it to do something or make something happen, including the capacity to do work is called energy.

Energy is the ability of a system to perform work or bring about change is represented by the fundamental idea of energy in physics. It has magnitude but no direction because it is a scalar quantity.

The principle of energy conservation states that energy can be changed from one form to another and that the overall energy of a closed system stays constant. Energy can, however, be converted or transported across various systems or objects, enabling movement or changes to take place.

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Answer:

decreases

Explanation:

halves and the speed remains unchanged.

The most distant stars we can currently measure stellar parallax for are approximately 1,000 parsecs away.

A parsec is a unity used to measure distance in the Universe, which is hard to understand with human thinking.

A parsec equals to approximately 3.20 light-years, which is  a small distance in the Universe.

In conclusion, the most distant stars we can currently measure stellar parallax for are approximately 1,000 parsecs away.

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Answer:

There must be an equal amount of each element on both sides of the equation. Hope this helps and please marks as the brainliest.

Explanation:

Answer:

The answer is D

Explanation:

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Some wave energy can be blanked through the other side in the process

known as Diffraction.

This usually occurs when a wave comes in contact with an obstacle. The

wave will bend itself around the corners of the obstacle so as to enable

its propagation to continue.

The obstructed wave can also pass through an aperture or hole if present

which is one of the important characteristics of waves.

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(a) The location of the final image beyond the converging lens is 12.67 cm.

(b) The magnification of the final image is -0.82, indicating that it is inverted with respect to the object.

To find the location of the final image, we can use the lens formula for thin lenses, which is given by 1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance.

For the diverging lens, u = -27 cm (since the object is in front of the lens), and f = -17 cm (negative for diverging lens). Using the lens formula, we find v1 = -153 cm.

For the converging lens, the object distance is -11 cm (since it is behind the diverging lens), and f = 17 cm. Using the lens formula again, we find v2 = 12.67 cm.

The magnification of the final image can be calculated using the formula magnification = v2/v1, which gives us -0.82. The negative sign indicates that the image is inverted with respect to the object.

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The production function will have constant returns to scale if 2αβ = 1

Constant returns to scale (CRS) implies that if all inputs increase by a factor of λ, the output increases by λ as well. The requirement for constant returns to scale (CRS) in a Cobb-Douglas production function with a new input factor is given by the sum of exponents on all variables equal to 1.

In this case, Y = AKαLβMγ.

Thus, we have that α + β + γ = 1 for constant returns to scale in K, L, and M, because the sum of the exponents is 1.

If the sum of the exponents is less than 1, it indicates decreasing returns to scale. If the sum of the exponents is greater than 1, it indicates increasing returns to scale. If we take γ = 0, we obtain the production function used in class, which is Y = AKαLβ, thus α + β = 1 for constant returns to scale in K and L.

When γ = 0, the answer we get is consistent with what we learned in class. Now, we consider the constant elasticity of substitution (CES) technology, where Y = [aKα + bLα]β. The production function will have constant returns to scale (CRS) in K and L if the sum of the exponents of K and L is equal to 1.

Therefore, αβ + αβ = 1, implying 2αβ = 1.

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