A human being can be electrocuted if a current as small as 50 mA passes near the heart. An electrician working with sweaty hands makes good contact with the two conductors he is holding. If his resistance is 2250 , what might the fatal voltage be

Answer:

Explanation:

m = 55 kg

a = 9.8

F = ?

The first thing you are going to do is find the force that the girl represents.

F = 9.81 * 55

F = 539.55

But that is not the answer. That is her weight. A very important part of this question is to realize that the floor is pushing up on her with an equal force.

Her weight is going DOWN.

The floor is pushing UP with a force of 539.55 Newtons.

The efficiency of a Carnot heat engine is given by the formula: efficiency = (1 - T_cold/T_hot), where T_cold is the temperature of the cold reservoir and T_hot is the temperature of the hot reservoir.

In this case, the hot reservoir temperature is 460 K and the cold reservoir temperature is 285 K. So, the efficiency of the Carnot heat engine can be calculated as follows:

efficiency = (1 - 285/460) = 0.3804 or 38.04%

Therefore, the efficiency of the Carnot heat engine operating between 285 K and 460 K is 38.04%.

It is worth noting that the Carnot cycle is an idealized theoretical cycle and no real engine can achieve 100% efficiency. However, the Carnot cycle serves as a benchmark for the maximum theoretical efficiency that any heat engine can achieve.

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Answer: acceleration is when speed increase

The process of an object changing position from one location to another is called "motion".

Movement, the act or process of moving or shifting locations or positions. ability to move with the force of a live body. gait is the term for the way a person walks. a gesture; a movement or shift in posture. Motion is the quality in which a body shifts its position with regard to time. The various motions include Linear motion: Linear motion is the movement of particles along a straight or curved route from one location to another.

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(a) The change in potential energy of the charge-field system can be calculated using the formula:
ΔPE = qΔV
where q is the charge of the particle and ΔV is the change in potential between the initial and final positions.

At the origin, the potential is taken to be zero. Therefore, the initial potential energy is zero. The final potential energy can be calculated as follows:

Vf - Vi = -Ed
where Vi and Vf are the initial and final potentials, respectively, and d is the displacement of the charge.

Since the electric field is uniform, the potential difference between any two points is directly proportional to their separation along the field. Therefore, we can write:

Vf - Vi = -Ed = -300 (20/100) = -60 V

Substituting the values in the formula for ΔPE, we get:

ΔPE = qΔV = (15.0 × 10^-6 C)(-60 V) = -0.9 μJ

Therefore, the change in potential energy of the charge-field system is -0.9 μJ.

(b) The potential difference through which the charge moves can be calculated as follows:

ΔV = Vf - Vi = -Ed = -300 (20/100) = -60 V

Therefore, the charge moves through a potential difference of -60 V. Note that the negative sign indicates that the potential decreases in the direction of the electric field.

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Answer:

The Independent Variable is the recorded fingerprint pattern.

The Dependent Variable is the shape of the fingerprint pattern.

The Control Group does not receive the Variable that you are testing

Explanation:

The types of elements found in each of the two classifications as metals and non-metals.

A.   Properties of Metals:

1. They are lustrous, i.e. they shine.

2. They are malleable, i.e. they can be drawn into sheets.

3. They are ductile, i.e. they can be made into wires.

4. They are good conductors of heat and electricity.

5. They have high density.

6. They have high melting and boiling points.

B.   Properties of Non-Metals:

1. They are non-lustrous, i.e. they do not shine.

2. They are non-malleable, i.e. they cannot be drawn into sheets.

3. They are non-ductile, i.e. they cannot be made into wires.

4. They are bad conductors of heat and electricity.

5. They have low density.

6. They have low melting and boiling points.

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From there, there was a strong and compact radio signal. There is a supermassive black hole at the Centre of our own Milky Way, according to the evidence that is most compelling.

There is a supermassive black hole in the Centre of the Milky Way that is four million times as big as the sun. Although we haven't really seen in radio signal, we are aware of its presence thanks to a number of pieces of evidence. First of all, a strong and compact radio signal is emanating from that area. Is called Milky Way.

A black hole is an area of spacetime where gravity is so intense that nothing can escape from radio signal, not even electromagnetic radiation like light. A sufficiently compact mass can distort spacetime to create a black hole, according to general relativity theory.

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Answer: The sound will increase in pitch.

Explanation:

According to the Doppler Effect, sounds will increase in pitch as they are nearing the listener, and then decrease in pitch as the sound moves further away. This is because when sound waves travel a shorter distance, the waves are more compact (higher frequency), producing a higher pitch. The further a listener is from the sound, the lower the pitch because the sound waves are more spread apart (lower frequency).

Answer:

Gravity

Explanation:

That's easy because gravity is the only thing that can pull us down that hard at that fast without anything helping it.

Answer:

Radio waves, I believe

Explanation:

Answer:

radio yes yup yup yup yup

Answer:

On the other hand, Florida's Gulf Coast experiences the greatest number of thunderstorms out of any U.S. location. These types of storms occur on average 130 days per year in Florida.

The arrangement of solid polonium atoms can be represented by a cubic unit cell, which is the simplest 3D cross-section that repeats throughout the solid, forming a repeating array in the crystal lattice.

Polonium, a metal, crystallizes in a simple cubic lattice. In this lattice, each atom is positioned at the corners of a cube, and the repeating cubic unit cells form the entire crystal structure.

The cubic unit cell is the most basic three-dimensional cross-section of the crystal lattice that, when repeated in all directions, forms the complete solid. This regular arrangement of atoms provides stability and a predictable pattern to the solid structure.

Understanding the arrangement of atoms within a crystal lattice is important for studying the properties of the material, such as its mechanical strength, electrical conductivity, and thermal conductivity.

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Answer:

Approximately \(5.76 \times 10^{-18}\; {\rm J}\) (by the external force that moved the electron.)

Explanation:

Let \(q\) denote the magnitude of a charge in an electric field of magnitude \(E\). The magnitude of the electrostatic force on that charge would be:

\(F = q\, E\).

In the electric field in this question, the magnitude of the electric force on the electron would be:

\(\begin{aligned}F &= q\, E \\ &= 1.6 \times 10^{-19}\; {\rm C} \times 600\; {\rm N \cdot C^{-1}} \\ &= 9.6 \times 10^{-17} \; {\rm N}\end{aligned}\).

Moving the electron to the other plate would thus require an external force of \(9.6 \times 10^{-17}\; {\rm N}\).

This force needs to be exerted over a distance of \(6.0\; {\rm cm}\) (\(6.0 \times 10^{-2}\; {\rm m}\).) The direction of the motion is the same direction as that of the external force. Thus, the work that needs to be done would be:

\(\begin{aligned}W &= F\, s \\ &\approx 9.6 \times 10^{-17}\; {\rm N} \times 6.0 \times 10^{-2}\; {\rm m} \\ &\approx 5.76 \times 10^{-18}\; {\rm J}\end{aligned}\).

The acceleration of the elevator at this time was 2m/s² and the elevator was accelerating the upward direction.

The mass of the child standing on a spring scale in an elevator is 30 kg the elevator is showing a reading of 360 Newtons.

The reading note by the elevator is given by radiation,

W = M(g+a)

Where w is the reading of the spring scale,

M is the mass of the child,

g is the gravitational acceleration which is given to be 10m/s² and a is the acceleration of the elevator.

Putting values,

360 = 30(10+a)

12 = 10+a

a = 2m/s²

As you can see from the above result that the acceleration of the lift is 2m/s² and because it is positive it means that the elevator is accelerating in the upward direction.

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Answer:

The speed of light is a constant, but it can accelerate by changing direction. For instance, light accelerates under the influence of gravity like every other falling object. Reflection is not a very meaningful form of acceleration since the Δt≈0, but it certainly a change in velocity.

A ground radar transmitting at a pulse repetition frequency (PRF) of 1200 pulses/second will have a maximum unambiguous range of approximately 67 nautical miles (NM).

To calculate the maximum unambiguous range, we divide the speed of light by twice the PRF. The speed of light is approximately 299,792,458 meters per second. Converting the PRF to hertz (Hz), we have

PRF = 1200 Hz.

Applying the formula:

Maximum unambiguous range = (Speed of light) / (2 * PRF)

Maximum unambiguous range = (299,792,458 m/s) / (2 * 1200 Hz)

Calculating the value, we find:

Maximum unambiguous range ≈ 124,913 meters

To convert this range to nautical miles, we divide by 1852 (1 NM = 1852 meters):

Maximum unambiguous range ≈ 67 NM

Therefore, the correct answer is option a. 67 NM.

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Population specification errors occur when the researcher does not understand who they should survey. This can be tricky because there are multiple people who might consume the product, but only one who purchases it, or they may miss a segment looking to purchase in the future.

Population specification errors occur when the researcher does not understand who they should survey. This can be tricky because there are multiple people who might consume the product, but only one who purchases it, or they may miss a segment looking to purchase in the future.

Population specification errors occur when the researcher does not understand who they should survey. This can be tricky because there are multiple people who might consume the product, but only one who purchases it, or they may miss a segment looking to purchase in the future.

Population specification errors occur when the researcher does not understand who they should survey. This can be tricky because there are multiple people who might consume the product, but only one who purchases it, or they may miss a segment looking to purchase in the future.

Measurement error is generated by the measurement process itself, and represents the difference between the information generated and the information wanted by the researcher. Generally, there is always some small level of measurement error due to uncontrollable factors.

4.0 × 10-19 J  is the energy of the photons emitted by the LED at a frequency of 610 THz

Define photon

A photon is a microscopic particle made up of electromagnetic radiation waves. Maxwell demonstrated that photons are merely electric fields moving through space. Photons move at the speed of light and have no charge or rest mass.

A photon is a tiny unit of electromagnetic energy that is essentially a particle of light. The frequency of the photon (i.e., how quickly the electric field and magnetic field oscillate; "fast electric field" and "wiggle" need better terminology) determines its energy.

E = hc / λ

c  = speed of light and, λ = wavelength

frequency = f = c / λ

E = hf

f  = 610 thz = 6.1 x 10¹⁴hz

h = 6.26 x 10⁻³⁴ Js

E = 6.26 x 10⁻³⁴ x 6.1 x 10¹⁴

E = 3.8 x 10⁻¹⁹ J = 4.0 × 10-19 J

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Answer:

1)The reactants are unlit charcoal, and the products are charcoal that has already burned and released its energy.

2)sugar + oxygen → carbon dioxide + water + energy

3)iron + oxygen → rusted iron + energy

4)an endothermic reaction, because ice absorbs heat to become liquid water

5)The temperature of the reactants is greater than the temperature of the products.

Explanation:

100%

The best type of remote sensing for analyzing the health of pine trees in the local mountains would be passive sensing using NIR, near-infrared sensors. Here option C is the correct answer.

This is because plants absorb and reflect light differently depending on their health and physiological state, and the near-infrared spectrum is particularly sensitive to changes in chlorophyll content and leaf structure, which are indicators of plant health.

By using remote sensing technology that captures NIR light reflected by the pine trees, it is possible to detect and analyze changes in the trees' health over time. Additionally, passive sensing is non-invasive, which is important for environmental monitoring and conservation efforts.

Active sensing, on the other hand, involves emitting signals and measuring the response, which can be more intrusive and may not provide the same level of detailed information as passive sensing with NIR sensors.

Complete question:

You are analyzing the health of pine trees in the local mountains, which type of remote sensing would be best?

A - active sensing using SLAR

B - active sensing using sonar

C - passive sensing using NIR, near-infrared sensors

D - passive sensing using visible light photography

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The property of a transverse wave that stays the same even as the wave's energy and other properties change is the wavelength.

The correct option to the given question is option a.

The wavelength is the distance between two successive points of the wave that are in phase. As the wave's energy and amplitude change, the distance between two successive points of the wave that are in phase remains the same.

This is because wavelength is determined by the frequency of the wave and the speed of propagation. The frequency of the wave is the number of cycles of the wave that occur in one second, while the speed of propagation is the rate at which the wave travels through a medium.

If the frequency of the wave and the speed of propagation remain the same, then the wavelength will also remain the same even as the wave's energy and other properties change. This property is known as the characteristic of the wave.The amplitude is the maximum displacement of a point on the wave from its rest position. The frequency is the number of cycles of the wave that occur in one second. The rest position is the position of the medium when it is not disturbed.

Hence, wavelength of a transverse wave remains same even as the wave's energy and other properties change.

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Answer:

220 seconds

Explanation:

Fibers of the sweater lose electrons because electrons are leave it.

One of the ways of charging a body is by friction. Charges are transferred from one body to another when an object is rubbed against another. This is charging by friction.

A sweater has negative charges hence when the balloon is rubbed against the sweater, fibers of the sweater lose electrons because electrons are leave it.

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1 Amphere  is the reading on ammeter current.

resistance= \(R1+R2=(1)/(12)+(1)/(30)=(1)/(0.11)=8.6\)

 voltage V = IR (Ohm's law) = 1.4×8.6=12.04V.

total current in the circuit = 1.4 A.

The voltage remains the same as it is a parallel connection.

I = V/R = 12.04 (total voltage)/12(Resistance R1)  = 1 A.

the ammeter will read 1 A.

Eddy currents are closed electric current loops that are created when a conductor comes in contact with a magnetic flux that is fluctuating. They induce electromagnetic induction according to Faraday's law and produce closed circuits in a direction perpendicular to the magnetic field. These currents will move in the opposite direction of the Lenz law's needed shift.

When a conductor moves through a magnetic field or when the magnetic field around a conductor at rest varies over time, eddy currents are produced. They result from fluctuations in the direction and strength of a magnetic flux or conductor-linked field.

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One specific natural resource in my region is timber, which is used for various purposes such as construction, furniture manufacturing, paper production, and fuelwood.

Timber is harvested from forests through logging operations. In sustainable timber harvesting, selective cutting methods are employed, where only mature trees are selectively removed while ensuring the regeneration and growth of younger trees.

To manage timber resources sustainably, efforts have been made to implement practices like reforestation, afforestation, and forest certification systems. Reforestation involves planting new trees to replace the harvested ones, while afforestation focuses on establishing new forests in previously non-forested areas. Forest certification systems, such as the Forest Stewardship Council (FSC), aim to ensure responsible forest management by setting standards for environmental, social, and economic aspects of timber production.

However, managing timber resources sustainably can be challenging due to conflicts between social, economic, and environmental needs. Social conflicts may arise between local communities who rely on forests for their livelihoods and the timber industry. Economic conflicts can occur when the demand for timber outweighs the available supply, leading to unsustainable practices. Environmental conflicts may arise when logging operations negatively impact biodiversity, water quality, or disrupt fragile ecosystems.

The effectiveness of natural resource management attempts for timber varies. While sustainable practices like selective logging and reforestation are positive steps, illegal logging and unsustainable practices still persist in some regions. The implementation and enforcement of forest certification systems have had mixed results, with challenges in ensuring widespread adoption and addressing issues related to corruption and inadequate monitoring. Collaborative efforts among stakeholders, including governments, industries, local communities, and environmental organizations, are crucial for the effective management of timber resources and balancing social, economic, and environmental needs. Continuous improvement in sustainable forest management practices, stronger regulations, and community engagement can further enhance the effectiveness of natural resource management in the timber sector.

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Explanation:

this might help you i think so

Answer:

Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres, between the infrared and the ultraviolet.

Here are the 7 from shortest to longest wavelength.

Violet - shortest wavelength, around 400-420 nanometers with highest frequency.  

Indigo - 420 - 440 nm.

Blue - 440 - 490 nm.

Green - 490 - 570 nm.

Yellow - 570 - 585 nm.

Orange - 585 - 620 nm.

Red - longest wavelength, at around 620 - 780 nanometers with lowest frequency.

Explanation: