An incandescent light bulb uses a coiled filament of tungsten that is 580 mmmm long with a diameter of 46.0 μm. At 20.0∘C tungsten has a resistivity of 5.25×10^−8Ω⋅m. Its temperature coefficient of resistivity is 0.0045 (C∘)−1(C∘)−1, and this remains accurate even at high temperatures. The temperature of the filament increases linearly with current, from 20∘C when no current flows to 2520∘C at 1.00 A of current.

What is the resistance of the light bulb at 20∘C?

the temperature at which the average velocity of an H2 molecule would be sufficient to escape Earth is  9,990 Kelvin. And the temperature at which the average velocity of an O2 molecule would be sufficient to escape Earth is approximately 2,740 Kelvin.

The average velocity of a gas molecule can be calculated using the root mean square (RMS) velocity, which is given by the equation:

v_rms = √(3kT/m)

Where v_rms is the RMS velocity, k is the Boltzmann constant (1.38 x 10^-23 J/K), T is the temperature in Kelvin, and m is the mass of the molecule.

a) For an H2 molecule with a mass of approximately 3.32 x 10^-27 kg, we can rearrange the equation to solve for temperature:

T = (v_rms^2 * m) / (3k)

Substituting the threshold velocity v_rms = 1.07 x 10^4 m/s, and the mass of H2 molecule m = 3.32 x 10^-27 kg, we can calculate the temperature:

T = (1.07 x 10^4 m/s)^2 * (3.32 x 10^-27 kg) / (3 * 1.38 x 10^-23 J/K) ≈ 9,990 K

Therefore, the temperature at which the average velocity of an H2 molecule would be sufficient to escape Earth is approximately 9,990 Kelvin.

b) Similarly, for an O2 molecule with a mass of approximately 5.32 x 10^-26 kg:

T = (v_rms^2 * m) / (3k)

Substituting the threshold velocity v_rms = 1.07 x 10^4 m/s, and the mass of O2 molecule m = 5.32 x 10^-26 kg, we can calculate the temperature:

T = (1.07 x 10^4 m/s)^2 * (5.32 x 10^-26 kg) / (3 * 1.38 x 10^-23 J/K) ≈ 2,740 K

Therefore, the temperature at which the average velocity of an O2 molecule would be sufficient to escape Earth is approximately 2,740 Kelvin.

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When reinstalling a wheel cylinder on the backing plate, the brake line should be started by hand three or four turns to prevent cross-threading of the wheel cylinder.So option c is correct.

When reinstalling a wheel cylinder on the backing plate, it is important to start the brake line by hand and turn it three or four times. This ensures that the threads of the brake line and the wheel cylinder align properly and prevents cross-threading. Cross-threading occurs when the threads of the brake line and the wheel cylinder do not align correctly, resulting in a misaligned or damaged thread connection. Cross-threading can lead to leakage of brake fluid and compromise the effectiveness of the braking system.

By starting the brake line by hand and turning it three or four times, you allow the threads to engage properly, ensuring a secure and leak-free connection between the brake line and the wheel cylinder. It is important to exercise caution and avoid over tightening the brake line to prevent damage to the threads.

Therefore option c is correct.

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Answer:

Some electrons move from the neutral object to the positively charged object. Both objects become positively charged, but the object that started positively charged is less positively charged than it was initially.

Explanation:

This is because since protons do not move from the nucleus, but, electrons on the surface move, the electrons from the neutral object move to the positively charged object until there is no net movement of electrons between both objects. At this point, both objects carry the same charge and the positively charged object becomes less positively than it was initially.

Answer:

Copper is a better heat conductor than glass. In general, we think of metals as good conductors. In fact, metals vary widely in their conductivity but, overall, they are better conductors of heat than most liquids and gasses. Other solids also vary in their capability to conduct heat.

Explanation:

The best thermal insulator is glass. The correct option is D.

The prevention of heat transfer between surfaces that are in thermal contact or within a radiative influence zone is known as thermal insulation.

In addition to using the right item forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.

The term "thermal insulation" refers to the various ways we try to prevent heat from transferring from one object to another.

These two items could be the inside and outside of exterior walls in residential structures or the hot and cold faces of processing equipment in industrial settings.

Glass has a very small amount of unpaired electrons that are not in use, making it a good electrical insulator. Extremely strong electron interactions hold the atoms of glass together.

Thus, the correct option is D.

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Answer:

Inertia is the tendency of an object to resist a change in its motion. Because of inertia, a resting object will remain at rest, and a moving object will keep moving. Objects with greater mass have greater inertia

Final velocity = 57.8m/s

What is acceleration?

In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object

Acceleration = (Initial velocity - Final velocity) /time

Given,

time = 3.4s

Acceleration = 17 m/s^2

17 = (0-v)/3.4

final velocity = 17 X 3.4 = 57.8 m/s

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The amount of water vapor in the air is 90% of what the air can hold at 70 degree temperature, can be concluded from "air temperature is 70 degrees, and the relative humidity is 90%" .

The relative humidity is a way to quantify the amount of moisture (water vapor) in the atmosphere. The ratio of the partial pressure of water vapor in the air to the vapor pressure of water at that specific temperature is what is used to describe it.

Percentage relative humidity = Partial pressure of water vapor in air/ vapor pressure of water × 100%

So, The air temperature is 70 degrees, and the relative humidity is 90% can be concluded as at 70 degrees temperature, the partial pressure of water vapor in the air is 0.9 times greater than that of water. In other words, the amount of water vapor in the air is 90% of what the air can hold at that temperature.

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Answer:

my big long peen for ur mom

Explanation:

Answer:

b) Quartz Clock

Explanation:

It's is a very type of clock which uses the vibration of quartz crystals to measure time accurately

The attenuation constant, also known as the absorption coefficient, is a physical property that describes the decrease in the intensity of a wave as it propagates through a medium.

Loss = 0.25db/m

convert db/m into np/m

1db= \(\frac{1}{20log_10e} np\)

\(1db=0.25*\frac{1}{20log_10e} np\\ = 0.0287np/m\)

Attenuation constant is commonly used in the study of electromagnetic waves, such as light and radio waves, as well as in the study of acoustic waves, such as sound waves. In these cases, the attenuation constant is determined by the physical properties of the medium through which the wave is traveling, including its density, viscosity, and other characteristics.

The attenuation constant is an important parameter in many practical applications, such as in the design of telecommunications networks and medical imaging equipment. In these applications, it is essential to understand how the wave will behave as it travels through the medium, in order to ensure that it can be transmitted or detected accurately and efficiently.

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Answer:

Explanation:

A capacitor is an electronic component that stores and releases electrical energy. It consists of two conductive plates separated by an insulating material called a dielectric. When a voltage is applied across the plates, charge accumulates on them, creating an electric field between the plates.

The capacitance of a capacitor is a measure of its ability to store charge. It is typically represented by the symbol 'C' and is measured in farads (F). In your case, you mentioned a 55-μF (microfarad) capacitor, indicating its capacitance value.

When a voltage waveform is applied across a capacitor, the capacitor charges and discharges in response to the changes in voltage. The rate at which the capacitor charges and discharges depends on the capacitance and the resistance in the circuit

Since there is no figure provided in the text, I am unable to reference it for the specific details of the voltage waveform. However, I can explain the general behavior of a capacitor when a voltage waveform is applied.

When a voltage waveform is applied across a capacitor, the capacitor charges and discharges in response to the changes in voltage. The behavior of the capacitor is determined by its capacitance, which is given as 55 μF in this case.

As the voltage waveform varies, the capacitor stores and releases electrical charge. During the rising portion of the waveform, the capacitor charges and accumulates energy. During the falling portion, the capacitor discharges and releases the stored energy.

The exact behavior and characteristics of the voltage waveform and the charging/discharging process depend on the specific shape and frequency of the waveform. Without the specific details of the voltage waveform provided in the figure, it is challenging to provide a more detailed analysis.

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The direction of the resultant acceleration is 17° North of West. The correct answer is D. The first step is to break down the forces into their horizontal and vertical components.

The eastward force from the ocean tide is purely horizontal, while the wind force has both horizontal and vertical components. To find the horizontal component, we use the cosine of the angle between the force and the horizontal axis:
1500 N * cos(45°) = 1060 N

To find the vertical component, we use the sine of the angle:
1500 N * sin(45°) = 1060 N

So the total horizontal force acting on the sailboat is:
4500 N + 1060 N = 5560 N

And the total vertical force is:
1060 N

To find the direction of the resultant acceleration, we can use trigonometry to find the angle that the acceleration vector makes with the horizontal axis. The tangent of this angle is equal to the vertical component of the acceleration divided by the horizontal component:
tan(θ) = 1060 N / 5560 N

θ = tan^-1(1060/5560) = 10.9°

Therefore, the direction of the resultant acceleration is 17° North of West. The correct answer is D.

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Answer:

78m

Explanation:

The density of the object is 10.5 grams/cm³.

The density of a substance indicates how dense it is in a given area. Mass per unit volume is the definition of a material's density. In essence, density is a measurement of how closely stuff is packed.

It is a particular physical characteristic of a specific thing. The Greek scientist Archimedes made the discovery of the density principle. If you are familiar with the formula and the relevant units, calculating density is simple.

Given parameters:

volume pf the object: V = 8 cm³.

Mass of the objection: M = 84 grams.

From definition of density, we can write that:

Density is equal to mass of the object divided by volume of the object.

Hence, density of the object = mass/volume

= 84 grams / 8 cm³

= 10.5 grams/cm³.

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Answer:

populations found in equatorial areas will have the darkest skin (most eumelanin) and populations at higher latitudes will have lighter skin

Explanation:

if its right i cant really see what the question is asking

Answer:

The correct answer is H ÷ ¹/₂T

Explanation:

The formula for velocity is distance covered ÷ time.

Neglecting air resistance;

If the ball's time of overall time flight is T, the time it will take for the second half/return trip is ¹/₂T.

If the ball's maximum height above its released point is H, the height will also be the distance it covered for the second part of the trip since the student caught the ball in the exact same place the ball was thrown. Hence, the distance for the second half of the trip will be H.

Since velocity = distance/time

The average velocity during the second half of the trip will be = H ÷ ¹/₂T

Answer:

Explanation:

5 C = 278 K

25 C = 298 K

V1 / T1 = V2 / T2

1.5L / 278 K = V2 / 298 K

V2 = (1.5L * 298) / 278

V2 = 1.61 L

The gravitational torque about the right end of the rod is 31.25 N·m.

Since the rod is uniform and horizontal, its center of mass is located at its midpoint. The weight of the rod acts vertically downward at the center of mass, so it does not create any torque about the right end of the rod.

Therefore, we need to consider only the torque created by the weight of the left half of the rod. The weight of the left half of the rod is:

W = (1/2)mg = (1/2)(5.0 kg)(10 m/s^2) = 25 N

The distance from the left end of the rod to the center of mass is:

d = L/4 = 1.25 m

where L is the length of the rod.

Therefore, the torque created by the weight of the left half of the rod about the right end is:

τ = Wd = (25 N)(1.25 m) = 31.25 N·m

The gravitational torque about the right end of the rod is 31.25 N·m.

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1. Five major external forces that affect organizations are economic, social, cultural, demographic, and technological. Economic factors such as inflation and interest rates can impact a company's profitability and purchasing power. Social factors like changing consumer preferences and lifestyles can influence demand for products and services.

Cultural factors like values and beliefs can shape consumer behavior and market trends. Demographic factors such as population size and age distribution can affect target markets.

Technological factors like advancements in automation or digitalization can disrupt industries and create new opportunities. These external forces shape the business environment and organizations must monitor and adapt to them to stay competitive.

2. Gathering competitive intelligence is crucial for businesses because it provides valuable insights about their competitors' strategies, strengths, weaknesses, and market position.

By understanding the competitive landscape, businesses can identify opportunities and threats, make informed decisions, and develop effective strategies.

Competitive intelligence helps businesses stay ahead of their competitors, anticipate market trends, identify emerging technologies, and improve their own products or services. It allows businesses to benchmark their performance, evaluate their competitive advantage, and identify areas for improvement.

Ultimately, gathering competitive intelligence empowers businesses to make proactive and strategic decisions that can lead to sustainable growth and competitive advantage.

3. In business, various economic variables need to be monitored as they have significant impacts on strategy applications. Some important economic variables include GDP (Gross Domestic Product), inflation rate, exchange rates, interest rates, consumer spending, unemployment rate, and industry-specific factors like raw material prices or energy costs.

Monitoring these variables helps businesses understand the overall economic conditions, identify market opportunities, and assess potential risks. For example, a high inflation rate may impact pricing strategies, while a favorable exchange rate can benefit export-oriented businesses.

By monitoring economic variables, businesses can adapt their strategies accordingly and make informed decisions to navigate the dynamic business environment.

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Answer:

Length is called a fundamental quantity because the length of an object does not change.

Explanation:

For example length of the body is a fundamental quantity as it cannot be expressed in terms of other quantity. Those physical quantities, which depend on two or more fundamental quantities or power of a fundamental quantity, are called derived quantities.

Answer:

d = 375 m

Explanation:

The speed of sound is constant in any medium, therefore we can use the uniform motion relationships

          v = x / t

          x = v t

In this case it indicates that the time since the sound is emitted and received is t = 0.50 s, in this time the sound traveled a round trip distance

           x = 2d

          2d = v t

          d = v t/2

let's calculate

          d = 1500 0.5 / 2

          d = 375 m

Answer:

The outside layer is the wettest.

Explanation:

No, the driver of the northward-moving vehicle was not within the speed limit when the collision occurred.

To determine whether the driver of the northward-moving vehicle was within the speed limit, we need to analyze the collision and the resulting skid marks.

Given that the skid marks left by the collided vehicles are parallel and at an angle of 55.0 degrees north of east, it indicates that the vehicles were not moving directly along the east or north direction. Instead, they were moving at an angle.

If the northward-moving vehicle was within the speed limit of 35 mi/h, its speed would not have been sufficient to result in skid marks at an angle of 55.0 degrees. The collision and the resulting skid marks indicate a significant impact and angular momentum, which would require a higher speed than the speed limit allowed.

Therefore, based on the skid marks and the collision angle, the driver of the northward-moving vehicle was likely exceeding the speed limit when the collision occurred, and his claim of being within the speed limit is not valid.

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x(t)=voₓ.t = vo cos α.t

the greater the initial speed, the further the distance obtained

The horizontal distance traveled by a projectile (also known as the range of the projectile) is determined by the initial speed of the projectile, as well as other factors such as the angle at which it is launched and the gravitational acceleration acting on it.

A projectile is an object that is projected into the air and follows a parabolic path under the influence of gravity. Examples of projectiles include balls thrown or kicked in sports, bullets fired from guns, and rocks or other objects that are thrown or dropped.

To determine the effect of the initial speed on the horizontal distance traveled by a projectile, you can use the following formula:

\(Range = (Initial speed)^2 * sin(2 * Launch angle) / gravitational acceleration\)

This formula shows that the range of a projectile is directly proportional to the initial speed of the projectile squared, and is also affected by the launch angle and gravitational acceleration.

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Answer:

1. Mechanics: Mechanic deals with the motion of objects. In real life, mechanic is used in determine the speed of an object a car in motion, a rocket projected into space, a jogging or walking man, etc.

2. Heat: Heat is a form of energy transferred due to the difference in temperature of two bodies. Heat flows from the hotter to the colder body always. The study of heat as been useful in the ares of cooking, power generation, energy derived from the food we eat etc.

3. Sound: Sound is due to vibrations of molecules. Sound energy travel in the form of waves through a medium from one body to another. The study of sound in physics is called acoustic physics, and it has been employed in the media houses like theaters and cinemas, and is also used in medical aids that assists hearing. Other real life phenomena include been able to hear myself type on my keyboard right now, and our ability to talk to and hear each other.

4. Light: Light is a form of energy, transmitted as an electromagnetic wave. Light wave has its unique wavelength in the e-m wave spectrum. Light helps us see things that we see by bouncing off of those things into our eyes. The eye is the only body organ that can be used to detect light. Study of light is useful in lighting technologies used at home and in other places. Light is very important in our daily lives.

5. Electricity and magnetism: Electricity is a phenomenon that results from the movement or flow of electrons through or from one body to another due to the presence of electric field around the body. Magnetism is an interaction between bodies is produced by a magnetic field around these bodies. These two phenomena has been known to be reversible and can each produce the other. Electricity is obviously used in our homes to power almost everything, generate magnetism, heat our homes etc. Magnetism is used in lifting in metal industries, used in generating electricity and is even used in our speakers to produce sound.

6. Atomic physics: Atomic physics studies atoms as an isolated system of electrons and an atomic nucleus. It studies the arrangement of electrons around the nucleus and the change brought about with changes to this arrangement. The study of atomic physic is most importantly utilized in the medical field for advanced diagnostic machines like the MRI.

7. Nuclear physics: This branch of physics studies the activities within the nucleus of an atom. It also studies the structures within the nucleus and the activities that produce these changes and the effect of these changes. The generation of electricity and the production of nuclear and atomic weapons are all thanks to nuclear physics.

8. Plasma physic: Plasma physics studies plasma, a state of matter comprised of charged particles. Plasmas are usually created by heating a gas until the electrons become detached from their parent atom or molecule. Plasma physics assisted with the understanding of some activities within our atmosphere like lightning and other phenomena like the northern and southern sky lights.

9. Geophysics: Geophysics studies physical activities within the earth's crust. Geophysics has been instrumental in deep earth mineral exploration for mining and petroleum industries, and also has been vital for the generation of electricity by geothermal means.

Answer:

C

Explanation:

The shorter a wire, the less it will be worn down from moving around, and the thicker the wire, the longer it will last.

Short wires with a wide diameter will be the material utilized to build a circuit with the minimum amount of resistance. Then, C is the right answer.

Electrical devices such as resistance, transistors, capacitors, inductors, and diodes are connected via conductive wires or traces that allow the electric current to pass between them.

A closed-loop system in which electrons can move is called a circuit. Electricity is supplied to the circuit by an electricity source, such as a battery. No electrons will travel till the circuit is finished, that is, it goes full round back to the electricity source.

A student wants to build a simple circuit.

The material would be used to design a circuit with the least amount of resistance will be short wires with a large diameter. Then the correct option is C.

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