One liter of water at 59◦C is used to make iced tea.
How much ice at 0◦C must be added to lower the temperature of the tea to 18◦C? The specific heat of water is 1 cal/g ·◦ C and latent heat of ice is 79.7 cal/g.
Answer in units of g.

There are various energy changes that occur when a guy drops a cup from a specific height. The cup's elevation above the ground gives it potential energy.

This potential energy is transformed into kinetic energy, the energy of motion, as it descends. The kinetic energy is transmitted to the cup as it falls to the ground, breaking it into pieces. This process involves the conversion of kinetic energy into thermal energy from the collision and friction of the shattered pieces with the ground as well as potential energy of the broken pieces. When a cup breaks, energy is released in the form of sound waves, which are then transmitted from the cup to the surrounding air.

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2 TW conductor is installed in a location where the ambient temperature is expected to be 102F and the temperature correction factor for conductor ampacity in this location is 0.82.

The correction factor depends on the type of insulation, the size of the conductor, the number of current-carrying conductors in a raceway or cable, and the type of installation.

The ability of a conductor to carry current decreases, which can result in potential hazards such as overheating and fire. In the case of the 2 TW conductor installed in a location with an ambient temperature of 102°F, the temperature correction factor of 0.82 indicates that the ampacity of the conductor must be reduced by 18%.

This reduction helps ensure that the conductor is not overloaded and can safely carry the required current without exceeding its maximum temperature rating.

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Compression is to crest as rarefaction is to Trough.

Hence, the correct option is B.

Because

In a longitudinal wave, compression refers to the region where the particles are closer together, while rarefaction refers to the region where the particles are farther apart.

The crest and trough, on the other hand, are terms used in transverse waves to describe the highest and lowest points of the wave, respectively. Therefore, in this analogy, rarefaction is equivalent to the trough.

Hence, the correct option is B.

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The heat engine operates by using a temperature difference between two thermal reservoirs and transferring energy from a hot reservoir to a cold reservoir. Usually, the efficiency of a heat engine is less than the maximum efficiency, which is the theoretical limit for the efficiency of the engine.

The important to keep the engine operating within a safe temperature range to prevent damage or failure.  A heat engine operates by using a temperature difference between two thermal reservoirs, transferring energy from a hot reservoir to a cold reservoir. In this process, it usually has an efficiency less than the maximum efficiency, as no engine can achieve 100% efficiency due to energy losses, primarily in the form of heat.

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Answer:C

Explanation:

You should just have to do the math and will get you C

In a one-dimensional completely flexible collision, a substance of mass m travels with velocity v0 in the +x direction for mass m and V/2 in an -x direction for mass 3m.

This direction of action" is simply the direction of an object's displacement over a short period of time. Because displacement split by this very short time interval approaches instantaneous speed (see Illustration 2.3), instantaneous the speed must point to the path of motion.

The four fundamental rules are the east, north, south, and west, which are often denoted by initials such as N, E, S, and W. The east and west directions are perpendicular to the south and the north.

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Those involved in hazardous waste operations at permitted TSD facilities must receive 40 hours of initial training. The correct answer is (c).

Hazardous waste operations involve handling and managing potentially dangerous substances, and it is essential that employees are adequately trained to ensure their safety and the safety of others. OSHA's Hazardous Waste Operations and Emergency

Response (HAZWOPER) standard requires employees involved in hazardous waste operations at permitted Treatment, Storage, and Disposal (TSD) facilities to receive a minimum of 40 hours of initial training. This training includes topics such as hazard recognition, personal protective equipment, and emergency response procedures. Additionally, employees who are expected to respond to emergency situations must receive an additional 8 hours of specialized training. The correct answer is (c).

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The type of electromagnetic radiation is Radiowaves which have a wavelength of 10 meters.

Since these waves have a longer wavelength, they are used for communication over long distances. Some examples of sources that emit these radiations - radiowaves - are TV and radio stations, cell phone towers, as well as satellites.

Radio waves are very beneficial as they can travel long distances without any power losses and getting absorbed or scattered by the atmosphere. Also, radio waves are non-ionizing and generally considered safe for human exposure. They are widely used in many applications, including broadcasting, navigation, remote sensing, and medical imaging.

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E. It accounted well for Galileo's observations of the phase cycle of Venus. It accounted well for Galileo's observations of the phase cycle of Venus. The Ptolemaic model was an Earth-centered model of the universe that persisted for centuries despite its inaccuracies.

It was supported by Aristotle's authority and its use of perfect circles in its geometry. Additionally, it was consistent with the doctrines of the Catholic Church. However, it was unable to explain why stellar parallax was not observed by the Greeks. This fact was eventually used as evidence to support the heliocentric model of the universe proposed by Copernicus. Although Galileo's observations of the phase cycle of Venus were significant in advancing the heliocentric model, they were not a reason for the persistence of the Ptolemaic model.

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(a). The skier slides approximately 9.89 meters along the hill before stopping.

(b). The magnitude of the force stopping the skier is approximately 12.53 N.

(a) Work done on an object is equal to the change in its kinetic energy:

[tex]W_{net} = \Delta K[/tex]

At the bottom of the hill, the skier has a kinetic energy of:

[tex]K_i = (1/2)mv^2 = (1/2)(73 kg)(4.2 m/s)^2 = 1326.18 J[/tex]

The skier has a gravitational potential energy of:

[tex]U_f = mgh = (73 kg)(9.8 m/s^2)[/tex](sin 9°)(x)

The net work done on the skier is equal to change in gravitational potential energy:

[tex]W_{net} = \Delta U = U_f - U_i[/tex]

Solving for x :

x = (K_i - U_f) / (mg sin 9°) = [tex](1326.18 J - (73 kg)(9.8 m/s^2)[/tex](sin 9°)(x)) / ([tex]73 kg[/tex])([tex]9.8 m/s^2[/tex])(sin 9°)

x = 9.89 m

(b)  Using trigonometry, we can calculate force:

F_parallel = mg sin 9° =[tex](73 kg)(9.8 m/s^2)[/tex](sin 9°) = 12.53 N

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Answer:

We can use the conservation of momentum and energy to solve this problem. Since the collision is perfectly elastic, both momentum and kinetic energy are conserved.

Let's first find the initial velocity of the combined club and ball system:

m_clubhead = 220 g = 0.22 kg  (effective mass of the clubhead)

m_ball = 46.0 g = 0.046 kg

v_clubhead = 45.0 m/s

The initial momentum of the system is:

p_i = m_clubhead * v_clubhead = 0.22 kg * 45.0 m/s = 9.90 kg·m/s

Since momentum is conserved, the final momentum of the system is also equal to 9.90 kg·m/s:

p_f = m_clubhead * v_clubhead' + m_ball * v_ball'

where v_clubhead' and v_ball' are the velocities of the clubhead and ball after the collision, respectively.

The initial kinetic energy of the system is:

KE_i = 1/2 * m_clubhead * v_clubhead^2 = 0.5 * 0.22 kg * (45.0 m/s)^2 = 222.75 J

Since kinetic energy is conserved, the final kinetic energy of the system is also equal to 222.75 J:

KE_f = 1/2 * m_clubhead * v_clubhead'^2 + 1/2 * m_ball * v_ball'^2

Now we can solve for v_ball':

p_f = m_clubhead * v_clubhead' + m_ball * v_ball'

9.90 kg·m/s = 0.22 kg * v_clubhead' + 0.046 kg * v_ball'

KE_f = 1/2 * m_clubhead * v_clubhead'^2 + 1/2 * m_ball * v_ball'^2

222.75 J = 0.5 * 0.22 kg * v_clubhead'^2 + 0.5 * 0.046 kg * v_ball'^2

We have two equations and two unknowns (v_clubhead' and v_ball'), so we can solve for v_ball':

v_ball' = (p_f - m_clubhead * v_clubhead') / m_ball

Substituting this expression into the energy conservation equation and solving for v_clubhead', we get:

v_clubhead' = sqrt(2/m_clubhead * (m_ball * v_ball'^2 + KE_i - KE_f))

Now we can use this equation to answer the questions:

(a) With the given data, we get:

v_ball' = (9.90 kg·m/s - 0.22 kg * 45.0 m/s) / 0.046 kg = 93.70 m/s

v_clubhead' = sqrt(2/0.22 * (0.046 kg * (93.70 m/s)^2 + 222.75 J - 222.75 J)) = 45.0 m/s

Therefore, the ball leaves the tee with a speed of 93.70 m/s.

(b) If we double the mass of the clubhead, the effective mass becomes 440 g = 0.44 kg, and the initial momentum of the system doubles to 19.80 kg·m/s. Using the same equations as before, we get:

v_ball' = (19.80 kg·m/s - 0.44 kg * 45.0 m/s) / 0.046 kg = 187.41 m

Explanation:

If we assume the same efficiency, then we can use Amdahl's Law to calculate the new runtime on 16 cores.

Amdahl's Law states that the speedup of a parallel program is limited by the portion of the program that must be executed sequentially. In this case, the portion that must be executed sequentially is (80-20)/80 = 0.75 or 75%. This means that only 25% of the program can be parallelized. Therefore, the speedup we can expect from doubling the number of cores is limited to 1/((1-0.25) + 0.25/8) = 1.85.
Using this speedup, we can calculate the new runtime on 16 cores as 20/1.85 = 10.81 seconds.

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When a mass hangs from the ceiling by a string and the mass is doubled, the travel time for a wave pulse traveling from the mass to the ceiling and back does not decrease by any factor.

The travel time for a wave pulse traveling from the mass to the ceiling and back depends on the length of the string and the gravitational force acting on the mass. If the mass is doubled, the gravitational force acting on it will also double. This will cause the string to stretch and become slightly longer, resulting in a longer travel time for the wave pulse. Therefore, the travel time will not decrease by any factor, but will actually increase slightly due to the increased gravitational force and stretching of the string.

When a mass hangs from the ceiling by a string and the mass is doubled, the travel time for a wave pulse traveling from the mass to the ceiling and back does not decrease by any factor. This is because the wave speed on the string depends only on the tension in the string and its linear mass density, and not on the mass of the object hanging from it. Therefore, doubling the mass does not affect the travel time of the wave pulse.

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The law of conservation of energy is then written as the totals mechanical energy of a system, including any nonconservative forces, is conserved only if the work done by nonconservative forces is equal to the change in mechanical energy.

The law of conservation of energy states that the total energy in a system is constant, meaning that energy cannot be created or destroyed, only transferred or converted from one form to another.

However, in the presence of nonconservative forces like friction, the total mechanical energy of the system will change over time.

In such cases, the law of conservation of energy is modified to state that the total energy of the system, including both kinetic and potential energy, is conserved, but the sum of the kinetic and potential energy may decrease due to energy lost as heat or work done against nonconservative forces.

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Electrical nonmetallic tubing is composed of a material that is resistant to moisture, chemical atmospheres, and is flame r etardant.

This statement is taken from the National Electrical Code (NEC) 362.2, which outlines the requirements for electrical nonmetallic tubing (ENT). ENT is a type of conduit that is commonly used to protect and route electrical wiring in residential and commercial buildings.

The material used in ENT is typically a type of thermoplastic polymer that is resistant to moisture, chemicals, and other environmental hazards. In addition, the material used in ENT must also be flame r etardant to prevent the spread of fire in the event of an electrical fault or other hazard. It is important to use ENT that meets the NEC requirements to ensure that it provides adequate protection and safety for electrical wiring in buildings.

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The question is asking for the work done on the athlete by the pushing force of the pole. The pushing force that the pole exerts back on the athlete is given as an external force. The work done by an external force is calculated using the formula W = Fd, where W is work, F is force, and d is the distance over which the force acts. In this case, the pushing force of the pole is given as an external force of unknown magnitude, but we are given the distance over which it acts, which is 0.20 meters. Therefore, we can use this distance along with the formula W = Fd to calculate the work done on the athlete:
W = Fd

We don't know the value of F, so we cannot solve for W directly. However, we do know that the pushing force of the pole is equal and opposite to the force exerted by the athlete on the pole. This is because of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. So, we can assume that the force exerted by the athlete on the pole is also equal in magnitude to the pushing force of the pole, but in the opposite direction. Therefore, we can rewrite the formula for work as:
W = -Fd
where the negative sign indicates that the work done is in the opposite direction to the force.
Now, we can substitute the given values into the formula to find the work done on the athlete:
W = -(F)(0.20)

We don't know the value of F, but we can assume that it is a positive value since the pole is pushing back on the athlete. Therefore, the negative sign in the formula will make the work done negative, indicating that it is in the opposite direction to the pushing force of the pole. Without knowing the value of F, we cannot calculate the exact amount of work done on the athlete. However, we can say that the work done will be negative and proportional to the magnitude of the pushing force of the pole, multiplied by the distance over which it acts.

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The correct answer is option c, an alteration of world-wide rainfall. Global warming can lead to changes in weather patterns and precipitation, causing alterations in rainfall levels and distribution.

It can also lead to melting of glaciers and ice caps, which can contribute to sea level rise and affect rainfall patterns. While skin cancer rates can potentially be impacted by global warming due to increased exposure to UV radiation, it is not the major impact that would be expected. Melting of the polar cap is a consequence of global warming.

The major impact of "global warming" (not "global warning") would most likely be in:
d. a melting of the polar ice caps.

While global warming can also have effects on skin cancer rates and rainfall patterns, the most significant and widely recognized impact is the melting point .

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The boxes are identical and they have the same mass. Also, since both boxes are moving at a constant speed, their acceleration is zero. Therefore, the force that Alice is applying to the box is also 55 N.

To find the magnitude of the force that Alice is applying to the box, we need to use the equation: force = mass x acceleration

Since both boxes are identical, they have the same mass. Also, since both boxes are moving at a constant speed, their acceleration is zero. Therefore, the force that Alice is applying to the box is also 55 N.

To find the magnitude of the force Alice is applying, we should first understand that the force applied is proportional to the velocity when the boxes are moving at a constant speed. Since Alice's box moves at 2.2 m/s and Bob's box moves at 1.1 m/s, Alice's box is moving twice as fast as Bob's box.

To maintain this constant speed, the force applied must also be doubled. Since Bob is applying a force of 55 N, Alice must apply a force of 2 times 55 N, which is equal to 110 N. Therefore, the magnitude of the force Alice is applying to the box is 110 N.

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The current supplied to the phone is 93.75 milliamperes (mA) or 0.09375 Amperes (A).

Part (a) Expression for the average current, I, supplied to the phone:

We can use the formula for electrical power:

Power = current x voltage

The energy lost by the battery each day is given by:

Energy = Power x time

E = P x t

Substituting Power = I x ΔV and time t = 24 hrs, we get:

E = I x ΔV x t

I = E / (ΔV x t)

Therefore, the expression for the average current supplied to the phone is:

I = E / (ΔV x t)

Part (b) Numeric value for the current in Amperes:

Substituting the given values, we get:

I = 6 J / (2.7 V x 24 hrs)

I = 0.09375 A or 93.75 mA

Therefore, the current supplied to the phone is 93.75 milliamperes (mA) or 0.09375 Amperes (A).

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The foam square become charged because C, Electrons were removed from it.

Electrons can move from one material to the other when two dissimilar materials are rubbed together, leading to an unbalanced charge. One substance may become positively charged as a result of losing electrons, while the other acquires electrons and becomes negatively charged.

The foam square and animal fur in this experiment had a negative charge on the foam and a positive charge on the fur due to the flow of electrons between the two materials due to friction.

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A department store ( continuous load) feeder supplies a lighting load of 103 ampere. The minimum size overcurrent protection device permitted for this feeder is 150 ampere.

In the event that the base size overcurrent security gadget allowed for a retail chain feeder providing a constant lighting heap of 103 amps is 150 amps, it wouldn't be consistent with the NEC rules. According to NEC, the overcurrent assurance gadget for consistent burdens ought to be evaluated somewhere around 125% of the ceaseless burden, which for this situation would be:

Least size = 125% x 103 amps

Least size = 128.75 amps

Consequently, a base size overcurrent insurance gadget of 150 amps wouldn't be satisfactory for shielding the circuit from over-burdening or short-circuiting, and it would represent a security risk. It is critical to adhere to the NEC rules to guarantee the wellbeing of the electrical framework and the structure tenants.

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The change in the system's kinetic energy of the 950-kg satellite orbiting the earth at a constant altitude of 90 km is zero.

This is because the satellite is orbiting at a constant altitude, meaning its distance from the Earth's center is constant, and therefore, its potential energy remains constant.  When the altitude is constant, there is no change in the system's kinetic energy, as the satellite maintains the same speed and distance from the Earth. Therefore, the change in kinetic energy is 0. Since the total energy of a satellite in orbit is constant, any change in potential energy is compensated by an equal and opposite change in kinetic energy. Therefore, since the potential energy is constant, the kinetic energy must also be constant.

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The answer is C, because water is denser, therefore it will take a longer time to reach the ears

A steadily rising pressure usually indicates clearing weather or fair weather.

In general, changes in barometric pressure can be used to predict changes in weather conditions. A rising barometric pressure usually indicates that the weather is clearing up or will remain fair, while a falling barometric pressure often indicates that stormy weather is on the way.

A steadily rising pressure indicates that the air pressure is increasing and the weather is likely to improve or remain stable. In contrast, a steadily falling pressure indicates that the air pressure is decreasing, which could indicate an approaching storm or other atmospheric disturbance. Fluctuating pressure and constant pressure are not necessarily indicative of any specific weather conditions.

So, the correct answer is a. steadily rising.

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A steadily rising pressure usually indicates clearing weather or fair weather.

The pressure is an important factor in predicting weather conditions.

A barometer is used to measure atmospheric pressure and it is typically reported in inches of mercury or millibars.

Changes in atmospheric pressure can provide important clues about the weather conditions that are expected to occur in the near future.

When the atmospheric pressure is steadily rising, it typically indicates that clearing weather or fair weather is on the way.

This is because high pressure systems generally bring with them clear skies and dry air, which can make for pleasant weather conditions.

In contrast, when the atmospheric pressure is steadily falling, it is typically an indication that stormy weather is on the way.

This is because low pressure systems generally bring with them cloudy skies and moist air, which can lead to precipitation and thunderstorms.

A constant pressure may indicate that the current weather conditions are likely to persist for a while.

However, it is important to note that changes in wind patterns or temperature can still affect the weather, even if the pressure remains constant.

Fluctuating pressure can be an indication that weather conditions are likely to change rapidly.

For example, if the pressure is dropping quickly, it may indicate that a storm is approaching.

In summary, understanding the relationship between atmospheric pressure and weather conditions can be helpful in predicting the weather.

A steadily rising pressure usually indicates clearing weather or fair weather, while a steadily falling pressure usually indicates stormy weather.

A constant pressure may indicate that the current weather conditions are likely to persist, while fluctuating pressure can be an indication that weather conditions are likely to change rapidly.

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To find the magnitude of the response at 6 rad/s for a first-order lag transfer function with a break frequency of 3 rad/s, we can use the formula:

|H(jω)| = 20log(1/√(1+(ω/ωb)^2))

where |H(jω)| is the magnitude of the transfer function, ω is the frequency of interest (in this case, 6 rad/s), and ωb is the break frequency (in this case, 3 rad/s).

Plugging in the values, we get:

|H(j6)| = 20log(1/√(1+(6/3)^2))
|H(j6)| = 20log(1/√(1+4))
|H(j6)| = 20log(1/√5)
|H(j6)| = 20log(0.447)
|H(j6)| = -8.5 dB

Therefore, the magnitude of the response at 6 rad/s for a first-order lag transfer function with a break frequency of 3 rad/s is -8.5 dB.

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d. Should be removed prior to withdrawing chlorine from the container. The fusible plug is designed to melt at a specific temperature in case of a fire, releasing the pressure inside the container and preventing an explosion.

However, if the plug is still in place when chlorine is being withdrawn, it can cause the chlorine to react with the metal plug and potentially create a dangerous situation. Therefore, it is important to remove the fusible plug before withdrawing chlorine from the container. Removing or tampering with the fusible plug could lead to hazardous situations when withdrawing chlorine. Always follow proper safety guidelines and procedures when handling chlorine containers.

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Transportation service provider provides convenient door-to-door service between two locations and is capable of carrying most any form of freight is (c).Truckload carried is correct option.

A truckload carrier is a kind of transport company that provides door-to-door service between two sites and has the ability to transport almost any kind of freight. These transporters frequently make use of sizable trucks that can handle full truckload (FTL) or less-than-truckload (LTL) delivery of heavy items.

They have the ability to move a variety of commodities, such as bulky items, perishable goods, and other kinds of cargo. Truckload carriers are frequently employed for long-distance transportation and are renowned for their adaptability, convenience, and capacity to move freight directly between two locations without making any stops in between or requiring transfers.

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Neptune:

Mercury:

The shape of Mercury's orbit is an ellipse.

The Sun is not at the center of Mercury's orbit because the orbit is not a perfect circle, and the gravitational pull of other planets affects the orbit of Mercury.

Mercury's motion in its orbit appears irregular because it moves faster when it is closer to the Sun and slower when it is farther away.

Earth:

The orbit of the Earth is also an ellipse.

Yes, the Sun is at the center of the Earth's orbit.

The motion of the Earth throughout its orbit is not at a constant speed. It moves faster when it is closer to the Sun (perihelion) and slower when it is farther away (aphelion).

Mars

The orbit of Mars is an ellipse.

Yes, the Sun is at the center of Mars's orbit.

Mars moves at varying speeds throughout its orbit, but it is generally faster when it is closer to the Sun.

Saturn:

The orbit of Saturn is an ellipse.

Yes, the Sun is at the center of Saturn's orbit.

Saturn moves at varying speeds throughout its orbit, but it is generally faster when it is closer to the Sun.

Comet:

The orbit of a comet is an ellipse.

Yes, the Sun is at the center of the comet's orbit.

The motion of the comet throughout its orbit is not at a constant speed. It moves faster when it is closer to the Sun (perihelion) and slower when it is farther away (aphelion). Additionally, the gravitational pull of other planets may affect the motion of the comet.

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True. THHN stands for Thermoplastic High Heat-resistant Nylon-coated. It is a type of electrical wire used in homes and buildings to carry power from the electrical panel to various devices, outlets, and appliances.

THHN wire is made of copper wire and is coated with a thermoplastic insulation material that provides protection against abrasion, chemicals, and moisture. The nylon covering helps to improve its durability and resistance to heat, making it suitable for use in environments with high temperatures up to 90 degrees Celsius. THHN wire is commonly used in commercial and industrial applications where high temperatures and moisture exposure are common.

THHN is a type of electrical wire commonly used for building wiring in North America. It stands for "Thermoplastic High Heat-resistant Nylon-coated." The wire has a thermoplastic insulation and a nylon jacket that provides protection against abrasion and chemicals. THHN wire can be used in dry or damp locations and has a maximum operating temperature of 90 degrees Celsius (194 degrees Fahrenheit). It is often used in conduit, cable trays, and other enclosed areas.

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The correct answer is c. methane. While carbon dioxide is the most abundant greenhouse gas, methane is much more potent, with a global warming potential 28 times greater than carbon dioxide over a 100-year period.

Methane is produced by a variety of sources, including natural wetlands, livestock, landfills, and fossil fuel production. Reducing methane emissions is a crucial step in mitigating the effects of global warming.

Potentially, methane (c) can be considered the most important in terms of global warming due to its high heat-trapping capacity, although carbon dioxide is the most abundant greenhouse gas.

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Answer:

chlorofluorocarbons (CFCs)

Explanation:

It has the highest GWP (Global Warming Potential). Got it right!

Have a good one!