A new cordless phone emits 4.0 mW at 5.8 GHz. The manufacturer claims that the phone has a range of 100 feet.
If we assume that the wave spreads out evenly with no obstructions, what is the electric field strength at the base unit 100 feet from the phone?
Need answer in "dimensions of an electric field" which I believe is N/C.

Answer:

Newton's Third Law states that "For every action, there is an equal and opposite reaction." An example of this law is the following scenario:

Imagine you are pushing a heavy box across the floor. According to Newton's Third Law, the box will exert an equal and opposite force back on you, making it harder to push. The more force you apply to the box, the greater the force it will exert back on you. This reaction force is what makes it difficult to push the box. The same idea applies when jumping off a diving board or jumping on a trampoline - the force you apply to the board or trampoline is equal and opposite to the force it applies back on you.

To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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As you descend into a lake from just below the surface to 10 feet under the surface, the net pressure force on your body increases while your weight stays the same. This is because the deeper you go, the more water there is above you, creating more weight and pressure.

The net pressure force on your body is the difference between the pressure on your skin from the water pushing down and the pressure inside your body pushing out. The deeper you go, the greater the pressure from the water pushing down on your body. However, your weight stays the same because the water you displace (the water you push out of the way as you descend) weighs the same as your body.

Therefore, the correct answer is that the net pressure force on your body increases and your weight stays the same as you descend from just below the surface to 10 feet under the surface. It's important to note that this increase in pressure can have physiological effects on your body, such as changes in heart rate and breathing, which is why it's important to take precautions when diving or spending extended periods of time underwater.

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The magnitude of the friction force required to keep the car from sliding is 13112 N.

Calculation:-

friction force = centripetal force

= mv^2 / R

= 1000*30^2 / (200/2)

= 9000 N

so option B) 9000 N is the correct answer

15) net force = mv^2 / R

              = 250*(96.5*5/18)^2 / 13.7

              = 13112 N = 1.31*10^4 N

Friction is the force resisting the relative motion of sturdy surfaces, fluid layers, and material factors sliding towards each specific. There are numerous styles of friction Dry friction is a strain that opposes the relative lateral movement of two stable surfaces in touch.

Friction is the shape of contact pressure. It exists between the surfaces that are in touch. The frictional force relies upon the character of the floor in contact. The rougher the ground, the extra friction is involved. The frictional force is proportional to the urgent pressure, which is the burden of the body. it's miles impartial of the place of the touch.

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Answer:

c. a and c

Explanation:

ammeters are connected in series to measure charge/current

Thermogenesis has been studied the plants in the genus arum, including skunk cabbage and the corpse flower. In these plants, these hypotheses have been provided to explain the reason behind thermogenesis

Thermogenesis, which takes place in specialised tissues such brown adipose tissue and skeletal muscle, is described as the disposal of energy through the generation of heat.

All metabolic activities involved in keeping the organism in a live condition require mandatory thermogenesis, which takes place in all organs. It also includes the energy used when food is consumed, digested, and processed (thermic effect of food, or TEF).

Thus, the reason behind thermogenesis are:

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We are given the following information about an inelastic collision.

Mass of 1st object = 4 kg

Mass of 2nd object = 10 kg

Initial velocity of 1st object = 25 m/s

Final velocity of both objects = 14 m/s

Initial velocity of 2nd object = ?

In an inelastic collision, the momentum is conserved but the kinetic energy is not conserved.

Recall that the total momentum is conserved and given by

Let us substitute the given values and solve for initial velocity of the body (u2)

Therefore, the initial velocity of the body of mass 10 kg is 9.6 m/s

If the p-value is equal to 0.01, the best conclusion is option D: "The null hypothesis might be true, but it is unlikely." Because this is considered to be a low probability, which suggests that it is unlikely that the null hypothesis is true.

A p-value of 0.01 means that there is a 1% chance of observing the test results (or more extreme results) if the null hypothesis is true. This is low probability and it unlikely tells us that the null hypothesis is true.

However, it is still possible that the null hypothesis is true and the observed results were due to chance, so we cannot completely reject the null hypothesis based on this p-value alone. When p-value is 0.01, the best choice is D.

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Answer:

Yes.

Explanation:

Food provides units of energy in the form of calories that give our bodies fuel to perform all functions from the most basic like breathing to more complicated activities. We need a minimum amount of calories from food to sustain basic metabolic functions and more to carry out physical activities. The more active we are, the more food we need.

Answer:

yes

Explanation:

because Our body uses energy for all of its functions and food is the main source of energy. Food contains nutrients that when broken down in the gastrointestinal tract release energy that can be used by the body's cells, tissues and organs for normal function, growth and repair.

The total cooling degree days (CDDs) of the two days is -10 CDDs. This is because the base temperature for cooling degree days is 65 degrees Fahrenheit, and both days had temperatures below 65 degrees Fahrenheit.

Cooling degree days (CDDs) are a measure of how much cooling is needed to maintain a comfortable indoor temperature.

They are calculated by subtracting the base temperature from the average temperature for a day or a period of days. The base temperature for cooling degree days is typically 65 degrees Fahrenheit.

In this case, the average temperature for day 1 is 45 degrees Fahrenheit and the average temperature for day 2 is 75 degrees Fahrenheit. Subtracting the base temperature from each average temperature gives us:

Day 1: 45 degrees Fahrenheit - 65 degrees Fahrenheit = -20 degrees Fahrenheit

Day 2: 75 degrees Fahrenheit - 65 degrees Fahrenheit = 10 degrees Fahrenheit

The total cooling degree days for the two days is the sum of the cooling degree days for each day, or -20 degrees Fahrenheit + 10 degrees Fahrenheit = -10 degrees Fahrenheit.

CDD_day_1 = 45 degrees Fahrenheit - 65 degrees Fahrenheit = -20 degrees Fahrenheit

CDD_day_2 = 75 degrees Fahrenheit - 65 degrees Fahrenheit = 10 degrees Fahrenheit

total_CDDs = CDD_day_1 + CDD_day_2 = -20 degrees Fahrenheit + 10 degrees Fahrenheit = -10 degrees Fahrenheit

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Using the work done relation, the value of force is 25 Newton.

When a force is applied along a displacement, "work" in physics refers to the energy that is transported to or away from an object. The following situations include work: relocating a table. a door being pulled and pushed. Walking. raising a stone.

The work W that a force F traveling across a distance x exerts on an object is calculated using the formula W=Fs. If the object is moving in the opposite direction from how we expect it to, we add a minus sign.

Work done is equal to displacement times force.

50J = force × 2

f=50/2

Force = 25 Newton.

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Therefore, the coin falls behind the passenger, indicating that the train is moving forward. In summary, the motion of the train is forward.

The motion of the train can be determined by considering the behavior of the coin. Since the coin falls behind the passenger, it implies that the train is moving forward. This can be explained by the concept of inertia. When the coin is tossed vertically, it also has a forward velocity due to the train's motion. As the coin is in the air, it maintains its forward velocity. However, since the passenger is also moving forward with the train, they perceive the coin's motion as being straight down. Therefore, the coin falls behind the passenger, indicating that the train is moving forward. In summary, the motion of the train is forward.

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Step index fibres have refractive indices of 1.45 for the cladding and 1.46 for the core. The pulse dispersion caused by the numerical aperture alone is measured in ns/km.

For TIR to occur, the core should have a higher refractive index than the cladding since TIR only occurs when light moves from a denser to a rarer medium.

The part of the fibre that carries light is called the core. The core is encircled by the cladding. A substance with a slightly lower index of refraction than the core makes up the cladding. Whole internal reflection takes place at the core-cladding boundary as a result of this discrepancy in the indices.

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Answer:

acceleration

rhymes with accelerator

Explanation:

the increase/decrease or the sudden change in speed and direction of object

Answer:

Yes, No, No

Explanation:

Wavelength and Frequency:

The relationship between wavelength and frequency of light is inversely proportional.

Mathematically,

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

The speed of light is 3×10⁸ m/s

For the given case, the frequency is 4.40×10¹⁴ Hz

Therefore, the wavelength of the red stop light is 6.81×10⁻⁷ m

answer:

in 18 years there are 9,467280 minutes

hope this helped! <3 i answered your question & hope you have a great day! if you wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)

The polarity of the charges on the top plate of a capacitor is positive. In a capacitor, two metal plates are separated by an insulating material, and a voltage is applied across the plates.

This causes electrons to move from one plate to the other, resulting in the buildup of positive charge on one plate and negative charge on the other.

The direction of the voltage determines the polarity of the charges on the plates, so the top plate will have a positive charge if the voltage is applied in one direction, and a negative charge if the voltage is applied in the opposite direction.

It is important to note that the charge on a capacitor plate is proportional to the voltage applied across the capacitor. As the voltage increases, so does the charge on the plate, and vice versa.

The polarity of the charges on the plates is also related to the capacitance of the capacitor, which determines the amount of electrical energy that can be stored in the capacitor. The capacitance of a capacitor depends on the size and separation of the plates, as well as the type of insulating material used.

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During a certain time interval, the net work done on an object is zero joules. We can be certain that the object's final speed is same as its initial speed.

When the net work done on an object is zero, this indicates that the kinetic energy of the body has not changed which means that the object's final speed is same as its initial speed.

Since, we know from the Work energy Theorem that the Change in Kinetic energy is equal to the work done.

So, Zero work indicates that the kinetic energy has not varied which directly signifies that the speed has not change in the course of the interval.

Work is done by the force acting on the body which gets transferred in the kinetic energy of the body.

Kinetic energy is the energy produced due to the motion of the body in the system.

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The correct option that best explains the role of social facilitation in accounting for the results of Study 2 is (a) individuals perform more efficiently when they know they are being observed compared to when they know they are not being observed.

Social facilitation is the term used to describe the process where the presence of others can affect the way that an individual performs a task. According to the definition, when an individual's performance improves in the presence of others, this is called social facilitation. In this study, when participants dressed in familiar clothing, they performed quickly, but when dressing in unfamiliar clothing, they performed more slowly. This means that the social facilitation took place, which resulted in an improvement in their performance while wearing familiar clothing.

Therefore, the correct answer is option (a) individuals perform more efficiently when they know they are being observed compared to when they know they are not being observed.

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Answer:

The work done by the 20 N force is 61.3 J

Explanation:

20 N Force at horizon is: F=20 N*cos 40=15.32 N

The work done by 20 N at horizon is: W=F*S=15.32 N* 4 m=61.3 J

Answer:

The work done by the 20 N force is 61.3 J

Explanation:

The momentum of the blocks must be preserved, therefore, we have the following relationship:

Where PA1 and PB1 are the initial momentum of the blocks and PB2, PA2 are the momentum of the blocks after release. Since the system is initially at rest this means that the initial momentum is zero:

Replacing the definition of momentum:

Where "m" is the mass and "v" the velocity, we get:

Form this we can solve for the velocity of block A:

Replacing the values:

Solving the operations:

The negative sign means that the block moves in the opposite direction to block B.

Now, since the spring drops, this means that it transfers all of its kinetic energy to the blocks, therefore, the initial energy of the spring must be equal to the sum of the kinetic energies of the blocks. This means:

Using the formula for kinetic energy:

Replacing we get:

Replacing the values:

Solving the operations we get:

Therefore, the energy of the spring was 8.64 Joules.

The two things that must exist for an electric current to be produced are:

An electric potential between two bodies and a conducting path joining the bodies.

This comes from the fact that when there is a potential difference there is an electrical field and hence a force that makes some free charges to move in the conductor. For this reason, there's an electrical current.

Answer: An electric potential between two bodies and a conducting path joining the bodies

The given statement " the mass on the slender barn oa pivoted at o with length l determine the frequency of small vibrations on the bar" is True because the mass on the slender bar OA pivoted at O with length L determines the frequency of small vibrations on the bar.

1. The mass of the slender bar, along with its length L and the pivot point O, are factors that contribute to the moment of inertia (I) of the bar.
2. The moment of inertia, along with the gravitational constant (g) and the distance from the pivot point to the center of mass, are used to calculate the angular frequency (ω) of small vibrations using the formula ω² = mgL/I.
3. The angular frequency (ω) is then used to determine the frequency of small vibrations (f) using the formula f = ω/(2π).

So, the mass on the slender barn oa pivoted at o with length l determine the frequency of small vibrations on the bar is True.

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Ammeters must be connected in series with the circuit in order to accurately measure the current flowing through the circuit. When an ammeter is connected in parallel with a circuit, it creates a low-resistance path, which can alter the current in the circuit and give inaccurate readings.

When an ammeter is connected in series, it becomes a part of the circuit and allows the current to flow through it. This way, the ammeter measures the actual current in the circuit, without altering it.
It is important to note that ammeters should only be connected in series with a circuit that is properly designed and has the necessary safety measures in place. Incorrectly connecting an ammeter can create a hazard and damage the equipment. Therefore, it is important to follow proper procedures and safety guidelines when using ammeters to measure electrical current.

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Answer:

a) R = 172.82 m, 5.3 north of east    b)   v = (0.24 ± 0.01) m / s

Explanation:

a) the displacement is a vector, so the easiest method to lock is looking for each component

let's start decomposing the vectors

 x₁ = - 160 m

second shift

angle 45 south of east

     cos (-45) = x₂ / d₂

     sin (-45) = y₂ / d₂

     x₂ = d₂ cos 45

     y₂ = -d₂ sin 45

     x₂ = 180 cos 45 = 127.28 m

     y₂ = -180 sin 45 = - 127.28 m

third shift

      cos 35 = x₃ / d₃

      sin 35 = y₃ / d₃

      x₃ = d₃ cos 35

      y₃ = d₃ sin 35

      x₃ = 250 cos 35 = 204.79 m

      y₃ = 250 sin 35 = 143.39 m ₃

X axis

       x_total = x₁ + x₂ + x₃

       x_total = -160 +127.28 +204.79

       x_total = 172.07 m

Y axis  

      y_total = y₁ + y₂ + y₃

      y_total = 0 - 127.28 + 143.39

      y_total = 16.11 m

to compose the displacement we use the Pythagorean theorem

      R = \(\sqrt{x^2 +y^2}\)

      R = \(\sqrt{172.07^2 + 16.11^2 }\)

      R = 172.82 m

in angle is

      tan θ = y_total / x_total

      ten θ = 16.11 / 172.07 = 0.0936

      θ = tan⁻¹ 0.0936

       θ = 5.3

angle is 5.3 north of east

b) the error in the distance is 5%,

               e% = ΔR/R  100

               ΔR = e% R / 100

               ΔR = 5 172.82 / 100

               ΔR = 8.6 m

the time error Dt = 20 s

We calculate the speed and this we calculate the error

      v = R / t

      v = 172.82 / 12 60

      v = 0.240027 m / s

the error in this magnitude is

      Δv = \(\frac{dv}{dR} \ \Delta R + \frac{dv}{dt} \ \Delta t\)

       Δv = \(\frac{1}{t} \ \Delta R + \frac{R}{t^2 } \ \Delta t\)

         Δv = \(\frac{ 8.6}{720} + \frac{172.82 \ 20}{720^2 }\)

         Δv = 0.013 m / s

the measurement result is

         v = (0.24 ± 0.01) m / s

Value analysis is a method used to evaluate the worth and effectiveness of an organization or project.

In the case of DEWA (Dubai Electricity & Water Authority), conducting a value analysis can provide insights into the overall value created by the organization. Here are some key points to consider in a value analysis of DEWA:

1. Service Quality: Evaluate the quality and reliability of the electricity and water services provided by DEWA. Assess factors such as uptime, response time, customer satisfaction, and the overall impact on the daily lives of residents and businesses in Dubai.

2. Cost Efficiency: Analyze the cost-effectiveness of DEWA's operations, including the generation, transmission, and distribution of electricity, as well as water production and distribution. Assess the efficiency of resource utilization, cost management practices, and the impact on consumer tariffs.

3. Sustainability: Evaluate DEWA's commitment to sustainable practices, such as renewable energy integration, water conservation efforts, and environmental stewardship. Assess the organization's contributions to reducing carbon emissions and promoting a greener future.

4. Innovation and Technology: Assess DEWA's adoption of innovative technologies, such as smart grids, advanced metering systems, and digital solutions. Evaluate the impact of these technologies on service delivery, efficiency, and customer experience.

5. Stakeholder Engagement: Analyze DEWA's relationships with stakeholders, including customers, suppliers, government entities, and the community. Assess the effectiveness of communication, collaboration, and the organization's contribution to social and economic development in Dubai.

By conducting a comprehensive value analysis of DEWA, stakeholders can gain a holistic understanding of the organization's performance, impact, and value proposition. This analysis can guide decision-making, identify areas for improvement, and support DEWA's ongoing efforts to provide reliable, sustainable, and affordable electricity and water services to the residents and businesses of Dubai.

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Answer:

Possiable answer by edge:

The shape of a river’s stream bed affects the speed and eroding power of a river by influencing the amount of friction between the water flowing through the river and the stream bed below. Friction is the force that opposes the motion of one surface as it moves across another surface. In a river, there is friction between the flowing water and the stream bed beneath it. Where a river is deep, less water comes into contact with the stream bed, so there is less friction. The reduced friction means there is less opposition to the water’s motion, so the river flows at a greater speed and has more kinetic energy for erosion. On the other hand, where a river is shallow, more water comes into contact with the stream bed, so there is more friction. The increased friction means there is more opposition to the water’s motion, so the river flows at a lesser speed and has less kinetic energy for erosion. Also, the roughness of a stream bed covered with boulders and other obstacles causes the water to flow through the river in a turbulent fashion. This could cause the river to move slower in some cases or erode more in other cases.

Explanation:

summary of answer:

influencing the amount of friction between the water flowing through the river and the stream bed below.

The total resistance in the circuit is 144Ω, and the total current is approximately 0.694A.

To find the total resistance and total current in the given circuit, let's break down the steps:

1. Delta to Wye Transformation:

  - Identify the resistors in the delta configuration: 200Ω, 40Ω, and 120Ω.

  - Apply the delta to wye transformation to convert the resistors into a wye configuration:

    - R₁ = (Rb * Rc) / (Ra + Rb + Rc) = (40 * 120) / (200 + 40 + 120) = 16Ω

    - R₂ = (Ra * Rc) / (Ra + Rb + Rc) = (200 * 120) / (200 + 40 + 120) = 96Ω

    - R₃ = (Ra * Rb) / (Ra + Rb + Rc) = (200 * 40) / (200 + 40 + 120) = 32Ω

  - Replace the delta configuration with the wye configuration using the calculated values: R₁ = 16Ω, R₂ = 96Ω, R₃ = 32Ω.

2. Total Resistance Calculation:

  - The total resistance (RT) in the circuit is the sum of the individual resistances:

    - RT = R₁ + R₂ + R₃ = 16Ω + 96Ω + 32Ω = 144Ω.

3. Total Current Calculation:

  - The total current (I) can be calculated using Ohm's Law: I = V / RT, where V is the voltage across the circuit.

  - Given that the voltage (V) is 100V, the total current (I) is: I = 100V / 144Ω = 0.694A.

Therefore, the total resistance in the circuit is 144Ω, and the total current is approximately 0.694A.

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