The first step to using ecology to solve environmental problems is to
a. ban the burning of fossil fuels.
b. close businesses that pollute.
c. use alternative fuels.
d. identify the problem.

The average speed of the doctor is 75 km per hour and his average velocity should be zero.

Given that,

Based on the above information, the calculation is as follows:

We know that

[tex]Speed = \frac{Distance}{Time}\\\\= \frac{75}{1}[/tex]

= 75 km per hour

Therefore we can conclude that the average speed of the doctor is 75 km per hour and his average velocity should be zero.

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To find the initial velocity of the bike rider, we can use the kinematic equation: vf = vi + at. Given that the final velocity is 7.5 m/s, the time is 4.5 s, and the displacement is 19 m, we can rearrange the equation to solve for the initial velocity.

To find the initial velocity of the bike rider, we can use the kinematic equation:
vf = vi + at

Given that the final velocity is 7.5 m/s, the time is 4.5 s, and the displacement is 19 m, we can rearrange the equation to solve for the initial velocity:

vi = vf - at

Substituting the given values, we get:
vi = 7.5 m/s - a * 4.5 s

Since the bike rider is pedaling with constant acceleration, we can assume that the displacement is given by:
d = vi * t + 0.5 * a * t^2

Substituting the given values, we get:
19 m = vi * 4.5 s + 0.5 * a * (4.5 s)^2

From these two equations, we have a system of equations that can be solved to find the initial velocity.

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To find the initial velocity of the bike with constant acceleration, we use kinematic equations that incorporate the given final velocity, acceleration time, and displacement. We calculate the acceleration first, and then solve for the initial velocity.

Finding the Initial Velocity of the Bike

To determine the initial velocity of the bike, we can use the kinematic equation that relates initial velocity, final velocity, acceleration, displacement, and time:

vf = vi + at
d = vi*t + (1/2)at²

Given that the final velocity (vf) is 7.5 m/s, acceleration time (t) is 4.5 s, and displacement (d) is 19 m, we can solve for initial velocity (vi). Using the second equation, we rearrange to solve for vi:

vi = (d - (1/2)at²) / t

We know the displacement and time, but we need to find acceleration (a) first. We use the first equation to find acceleration:

7.5 m/s = vi + a(4.5 s)

Since we don't have vi yet, we use this equation after finding acceleration with the displacement:

19 m = vi(4.5 s) + (1/2)a(4.5 s)�

From the above information, we can calculate acceleration. We'll then use that to find the initial velocity. With these calculations, the student will understand the steps to find the initial velocity of a bike when given its final velocity, acceleration time, and displacement.

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Final answer:

The correct option is (b) the wavelength of the waves. Adele can differentiate between colors based on the wavelength of light waves. Color perception is linked to light's wavelength, with blue having shorter wavelengths, and red longer wavelengths. Therefore, wavelength is key in distinguishing between colors.

Explanation:

Adele is able to differentiate between the colors yellow, green, and blue in her room because of the wavelength of the light waves. Light that is visible to humans makes up only a small portion of the electromagnetic spectrum, and within this spectrum, color perception is directly linked to wavelength.

Longer wavelengths are associated with the color red, intermediate wavelengths with green, and shorter wavelengths with blue and violet colors. This explains why Adele perceives different colors, as each hue represents light of a specific range of wavelengths.

Thus, the correct answer to what light wave attribute allows Adele to differentiate between these colors is b. the wavelength of the waves.

When organizing colors by wavelength, from shortest to longest, it goes from blue to yellow to red. Conversely, when arranging according to frequency, which is inversely related to wavelength, the order is red (lowest frequency), yellow, and then blue (highest frequency).

This demonstrates the inverse relationship between wavelength and frequency in the electromagnetic spectrum.

The driver's acceleration is approximately 0.08 m/s^2.

The driver's initial speed was 80 km/h and he reaches 110 km/h after driving a distance of 500 m. To find the driver's acceleration, we can use the formula:

Acceleration = (Final Speed - Initial Speed) / Time

Since the distance is given, we need to find the time taken.

Using the formula:

Distance = Initial Speed * Time + (1/2) * Acceleration * Time^2

We can substitute the given values (Initial Speed = 80 km/h, Final Speed = 110 km/h, Distance = 500 m) and solve for the time. Once we have the time, we can substitute it back into the first equation to find the acceleration.

After calculating, the driver's acceleration is approximately 0.08 m/s^2.

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The line is a conceptual 'line of sight' from the football to the sideline, and a yard, used for measurements on the field, is equal to three feet; this standardization ensures fairness in football games.

The imaginary line from the tip of the football to the sideline in a football game is often referred to as a line of sight or simply directional line. This is not a technical term defined in the rules of football, but rather a conceptual way to describe that specific direct path. When discussing measurements within the context of a football field, it is important to understand the length of a yard. A yard is a standard unit of linear measure equal to three feet. Moving the ball ten yards leads to a first down and this distance is consistent across all professional football fields, ensuring the game's uniformity.

Answer:

Velocity is a speed with a direction vector associated with it speed is just a displacement per unit of time which makes it scalar

Explanation

Answer: Plato users - B.  radio telescope

Explanation:  just took test

Only a hurricanes speed is not enough information to be able to warn people to evacuate.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.

Only knowing a hurricane's speed is insufficient information to issue an evacuation warning because the speed does not reflect the strength of the hurricanes, and the speed of the hurricanes does not tell anything about the directional, movement of the hurricanes as we know the speed is a scalar quantity which does not tell anything about the direction of the moving object.

Thus, only knowing a hurricane's speed is insufficient information to issue an evacuation warning.

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The wavelength of the light is approximately 633 nanometers (nm).

Wavelength is simply the distance over which the shapes of waves are repeated. It is expressed as:

λ = c ÷ f

Where λ is wavelength, c is speed of light and f is frequency.

Given the parameter:

Frequency f = 4.74 × 10¹⁴ Hz

Speed of light c = 3.00 × 10⁸ m/s

Wavelength λ =?

Plug the values into the above formula and solve for the wavelength λ:

λ = c ÷ f

λ = (3.00 × 10⁸) ÷ (4.74 × 10¹⁴)

λ = 6.33 × 10⁻⁷ meters

λ = 6.33 × 10⁻⁷ meters × 1,000,000,000

λ = 633 nm

Therefore, the wavelength measures 633 nm.

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Answer:

This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focuses at a common point.

Explanation:

This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focus at a common point.

"Chromatic aberration is a phenomenon in which light rays passing through a lens focus at different points, depending on their wavelength. There are two types of chromatic aberration: axial chromatic aberration and lateral chromatic aberration."

"Wavelength is the distance travelled by a particle on the wave when it completes one oscillation. Meters (m) is the SI unit. "Amplitude is the maximum distance covered by the particle from its mean position. The number of oscillations completed in unit time is known as frequency.

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Answer: The correct answer is an emission line spectrum.

Explanation:

When the electrons are excited to the higher energy level, the energy is absorbed in this case.

When the electrons in the atom step down to lower energy levels in a thin cloud of hot gas then the radiation will emit.

The electron will lose energy in this case in the form of radiation. There will be an emission line spectrum.

When the electrons step down to lower energy level, emission line spectrum produced.

Further Explanation:

The spectrum of emission of an element is spectrum of wavelength of radiation emitted during the transition of electron from a higher energy level to lower energy level. The energy of photon emitted in this process is equal to difference between the two levels. There is possibility of different types of transition for an atom and energy difference is specific for each atom.

When electrons are excited in atom, extra energy forces electrons to higher energy orbital. When electron goes to lower state, energy releases in form of photon. This emitted photon form the emission line spectrum.

Emission is process in which higher energy state of the particle convert into a lower state through the emission of photon, which produces light. The frequency of emitted light is function of transitional energy.

Since energy of system conserved, difference in energy between two states equal to energy carried by photon. The energy state of transitions results in emission of large frequency range.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Modern physics

Keywords:

Electrons, step, lower, energy, levels, thin, cloud, hot, gas, emission, line, spectrum, ground, state, higher, radiation, transition, energy, light and photon.

The magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole is 76.6 N.

To find the kinetic frictional force, we first need to calculate the work done by friction during the fireman's slide. This can be found using the work-energy principle, where the work done equals the change in kinetic energy. The kinetic energy just before landing is given by (1/2)mv2, where m is the mass (86 kg) and v is the velocity (1.4 m/s). The potential energy lost during the descent is mgh, where g is the acceleration due to gravity (9.8 m/s2) and h is the distance (4.0 m). The work done by friction is the difference between the initial potential energy and final kinetic energy. Solving these gives the frictional force as the work done by friction divided by the distance traveled down the pole.

The light pulse that will reach you first is: (C). the two light pulses will reach you at the same time.

Light according to physics can be defined as electromagnetic radiations that are visible to the eyes. Light speed in a vacuum is always constant and currently the speed of light in air is 3 * [tex]10^{8}[/tex] m/s

A light pulse is defined as an optical pulse of flashes of light.

In conclusion, The light pulse that will reach you first is the two light pulses will reach you at the same time, since the light was sent at the same distance.

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Answer:

1= Cerebrum.

2=Ventricles  

3.Cerebellum.

4.Brain stem  

5.Spinal cord.

Explanation:

The mass of the ball is approximately 18.57 grams.

To determine the mass of a ball with a given velocity and wavelength, we can use the de Broglie relation, which states that the wavelength [tex]\( \lambda \)[/tex]of a particle is inversely proportional to its momentum  p . The de Broglie relation is given by:

[tex]\[ \lambda = \frac{h}{p} \][/tex]

where h is Planck's constant[tex]6.626 \times 10^{-34} \)[/tex] Js) and  p  is the momentum of the particle. The momentum can also be expressed as the product of the mass  m of the particle and its velocity  v :

p = mv

Combining these two equations, we get:

[tex]\[ \lambda = \frac{h}{mv} \][/tex]

Rearranging the equation to solve for mass  m , we have:

[tex]\[ m = \frac{h}{\lambda v} \][/tex]

Given:

- Velocity v = 40.0 m/s

- Wavelength[tex]\( \lambda = 8.92 \times 10^{-34} \)[/tex]m

- Planck's constant \[tex]h = 6.626 \times 10^{-34} \)[/tex] Js

Plugging in the values, we get:

[tex]\[ m = \frac{6.626 \times 10^{-34} \text{ Js}}{(8.92 \times 10^{-34} \text{ m})(40.0 \text{ m/s})} \][/tex]

[tex]\[ m = \frac{6.626 \times 10^{-34}}{8.92 \times 10^{-34} \times 40.0} \][/tex]

[tex]\[ m = \frac{6.626}{8.92 \times 40.0} \][/tex]

[tex]\[ m \ =\frac{6.626}{356.8} \][/tex]

[tex]\[ m \ = 0.01857 \text{ kg} \][/tex]

Converting the mass to grams (since 1 kg = 1000 g), we have:

[tex]\[ m \ = 0.01857 \text{ kg} \times 1000 \text{ g/kg} \][/tex]

[tex]\[ m \ =18.57 \text{ g} \][/tex]

The Temperature in Chattanooga, Tennessee is -3 °C, then the temperature in Sam's hometown will be equal to -21 °C.

A temperature is a unit of hotness or coldness that can be described in terms of a variety of arbitrary scales. It also indicates the direction in which thermal energy will naturally flow, i.e., from a hotter body to a region of lower temperature.

Temperature is not the same as the energy of the thermodynamic system; for instance, an iceberg has considerably higher heat than a burning match, but it has a far larger total heat energy than a match.

As opposed to extensive qualities like mass or volume, which are reliant on the amount of stuff being studied, the temperature is an intensive attribute, just like pressure or density.

As per the given information in the question,

The temperature in Chattanooga, Tennessee = -3 °C

The temperature in Sam’s hometown is 18° colder than that.

Then, the temperature in his hometown will be,

= -3 - 18

= -21 °C.

Therefore, the temperature in the hometown will be -21 °C.

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According to the definition of mechanical work, the pushing on a rock accomplishes no work done unless there is a movement in the same direction as the direction of the force.

Mechanical work is the amount of energy which is transferred by a force that is applied on the object. Like that of other energies, it is a scalar quantity, with the SI units of joules. The heat conduction is not considered to be a form of work done, since there is no macroscopically measurable force, only microscopic forces occurring in atomic collisions.

According to the definition of mechanical work, the pushing on a rock accomplishes no work unless there is a movement in the same direction as that of the direction of the force applied.

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A carbon atom and an oxygen atom share four electrons in a double covalent bond in a molecule of carbon dioxide to achieve stability.

The carbon and oxygen atoms share electrons through covalent bonding, which is a type of chemical bond where atoms share pairs of electrons. In the case of carbon dioxide (O=C=O), a molecule consisting of a single carbon atom and two oxygen atoms, there are two double covalent bonds to achieve stability. Each double bond involves the sharing of two pairs of electrons (four electrons in total) between the carbon and oxygen atoms. Hence, this indicates that a carbon atom and an oxygen atom share four electrons in a double covalent bond.

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The term names the other main method of reproduction is :  (B). Fusion

Reproduction can be defined as the act of producing off springs by a parent organism either by different means.

Reproduction is very important because it is the only means a species existence can continue and also it is the  only way a race will not go extinct.

In conclusion, The term names the other main method of reproduction is Fusion

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The formula for this law is P1/T1 = P2/T2. Temperatures must always be expressed in kelvins when using gas laws.

Gay-Lussac's Law, also known as Amontons' law, states that the pressure of a gas is directly proportional to its absolute temperature, provided that the volume and amount of gas remain constant. The mathematical expression for Gay-Lussac's Law is:

P1/T1 = P2/T2

where P1 and P2 are the initial and final pressures, and T1 and T2 are the initial and final absolute temperatures (in Kelvin). This means that if the temperature of a gas increases, its pressure also increases, as long as the volume does not change.

For example, if a gas in a sealed container is heated from 300 K to 600 K, its pressure will double assuming the volume of the container remains constant.

It is important to note that temperatures must always be expressed in kelvins when using gas laws. Gay-Lussac's Law is similar to Charles's Law but focuses on the relationship between temperature and pressure instead of temperature and volume.

The answer is B. Perfect.