To determine the required THHN conductor size for an air-conditioning unit with a conductor ampacity of 34 amperes and terminals rated at 75 degrees Celsius,
Please follow these steps:
1. Refer to the National Electrical Code (NEC) table 310.15(B)(16) for allowable ampacities of insulated conductors rated up to and including 2000 Volts.
2. Locate the column for the 75-degree Celsius terminal rating, as specified by your equipment and circuit breakers.
3. Find the conductor size that has an ampacity equal to or greater than 34 amperes in the 75-degree Celsius column.
Following these steps, you will find that the appropriate THHN conductor size for your air-conditioning unit is 8 AWG, as it has an allowable ampacity of 50 amperes in the 75-degree Celsius column, which is sufficient for the required 34 amperes.
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You kick a can. Why does the can and your foot move if the forces are equal and opposite?
the 8.00 a current through a 4.00 mh inductor is switched off in 8.33 ms. what is the emf induced (in v) opposing this?
The induced emf opposing the current is approximately -3.84 V for the 8.00 A current through a 4.00 mH inductor is switched off in 8.33 ms.
To find the induced emf in the inductor, we can use the formula:
emf = -L * (ΔI/Δt)
where:
emf = induced electromotive force (in volts)
L = inductance of the inductor (in Henrys)
ΔI = change in current (in amperes)
Δt = time taken for the current to change (in seconds)
Given the information in your question:
L = 4.00 mH = 4.00 * [tex]10^{-3}[/tex] H (converting millihenry to henry)
ΔI = 8.00 A (since the current is switched off, the change is equal to the initial current)
Δt = 8.33 ms = 8.33 * [tex]10^{-3}[/tex] s (converting milliseconds to seconds)
Now, we can plug these values into the formula:
emf = - (4.00 * [tex]10^{-3}[/tex] H) * (8.00 A) / (8.33 * [tex]10^{-3}[/tex] s)
emf = - (32 * 10^-3) / (8.33 * [tex]10^{-3}[/tex])
emf ≈ -3.84 V
The induced emf opposing the current is approximately -3.84 V. The negative sign indicates that the induced emf opposes the change in current, as expected.
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The EMF induced in the inductor opposing the change in current is approximately 3.84 V.
To find the EMF induced in the inductor, we'll need to use the formula for the induced EMF in an inductor, which is:
EMF = -L × (ΔI / Δt)
Here, EMF is the induced electromotive force, L is the inductance, ΔI is the change in current, and Δt is the time interval during which the current changes.
Given the information in your question, we have:
[tex]L = 4.00 mH = 0.004 H[/tex] (converting millihenries to henries)
[tex]ΔI = 8.00 A[/tex] (the current goes from 8 A to 0 A)
[tex]Δt = 8.33 ms = 0.00833 s[/tex] (converting milliseconds to seconds)
Now, plug the values into the formula:
EMF =[tex]-0.004 H × (8.00 A / 0.00833 s)[/tex]
EMF = [tex]-3.8408 V[/tex]
Since we're looking for the magnitude of the induced EMF, we can ignore the negative sign:
EMF = 3.8408 V
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a piece of a thick ring of metal with height h and resistance r is connected to a battery, creating a uniform current i throughout the piece of ring, as shown in the figure above. a second piece of a ring has height 2h but is otherwise identical to the first piece. the second piece of ring is connected to the battery in the same way as the first piece. what is the resistance of the second piece?
The resistance of the second piece of the thick ring of metal is half the resistance of the first piece, or R2 = r/2.
Given that a piece of a thick ring of metal with height h and resistance r is connected to a battery, creating a uniform current i throughout the piece of ring, and a second piece of a ring has height 2h but is otherwise identical to the first piece and is connected to the battery in the same way as the first piece, we can determine the resistance of the second piece by following these steps:
1. Recall the formula for resistance:
R = ρ(L/A)
where
R is resistance,
ρ is resistivity,
L is length, and
A is the cross-sectional area.
2. For the first piece, the cross-sectional area A1 is height h times width w, so A1 = hw.
3. For the second piece, the height is 2h. The cross-sectional area A2 is height (2h) times width w, so A2 = 2hw.
4. The ratio of the cross-sectional areas of the two pieces is
A1/A2 = (hw)/(2hw)
= 1/2.
5. Since the pieces are otherwise identical, their resistivities (ρ) are the same. The ratio of the resistances is
R1/R2 = (ρL1/A1) / (ρL2/A2)
= (L1/A1) / (L2/A2).
6. Both pieces have the same length, so L1 = L2. Therefore, the ratio of the resistances is
R1/R2 = (1/A1) / (1/A2)
= A2/A1.
7. Substituting the ratio of the cross-sectional areas, we have R1/R2 = 1/2.
8. The resistance of the second piece is R2 = R1 * (1/2).
Thus, the resistance of the second piece of the thick ring of metal is half the resistance of the first piece, or R2 = r/2.
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[DOUBLE RAINBOW PIC]24. Determine the magnitude of the magnetic field if ion A travels in a semicircular path of radius 0.50 m at a speed of 5.0 × 106 m/s.
The magnitude of the magnetic field is [tex]5.22 * 10^{-5}[/tex] Tesla if ion A travels in a semicircular path of radius 0.50 m at a speed of [tex]5.0 * 10^{6} m/s.[/tex]
To determine the magnitude of the magnetic field, we can use the formula for the magnetic force acting on a charged particle moving in a magnetic field: F = q * v * B * sin(θ)
Since the ion A is moving in a semicircular path, the angle θ between the velocity and magnetic field vectors is 90°, and sin(90°) = 1. In this case, the magnetic force F is equal to the centripetal force F_c, which is given by: [tex]F_c = m * v^2/r[/tex]
Here, m is the mass of the ion, v is its speed, and r is the radius of the path. We know the speed ([tex]v = 5.0 * 10^{6} m/s[/tex]) and the radius (r = 0.50 m).
[tex]q * v * B = m * v^2 / r[/tex]
Now, we can rearrange the equation to find the magnitude of the magnetic field (B):
B = (m * v) / (q * r)
Assuming ion A has a charge of [tex]+1.6 * 10^{-19} C[/tex] (which is the charge of a proton), and a mass of approximately [tex]1.67 * 10^{-27}[/tex] kg (which is the mass of a proton), we can plug in the given values to get:
[tex]B = (1.67 * 10^{-27} kg)(5.0 * 10^{6} m/s) / (+1.6 * 10^{-19} C)(0.50 m)[/tex]
[tex]B = 5.22 * 10^{-5} T[/tex]
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A spring is stretched from 0.25 meter to a length of 1.50 meters by a weight of 3.20 N. What is the spring contant? Step by step please
Answer:
2.56 N/m
Explanation:
The force exerted by a spring is given by the equation:
[tex]F_s = kx[/tex]
where [tex]k[/tex] is the spring constant, and [tex]x[/tex] is the distance that the spring is stretched or compressed from its equilibrium.
To find [tex]x[/tex], we will simply subtract the spring's initial position from its final position:
[tex]x = 1.50 m - 0.25 m\\x = 1.25 m[/tex]
It is given in the problem that the force exerted by the spring is 3.20 Newtons. So, we can solve the equation for [tex]k[/tex] and calculate the spring constant.
[tex]k = \frac{F_s}{x} \\k = \frac{3.20N}{1.25m} \\k = 2.56 N/m[/tex]
which statement about eddy currents is false? they can be used as a passive braking system, as no external power source is needed if permanent magnets are used. the mechanical energy that is lost when eddy currents are created returns when the eddy currents cease. the faster the conductor moves, the larger the eddy currents will be. they are created in solid conducting plates as they move in and out of magnetic fields. they can be prevented by cutting a slot in a solid conducting plate, to prevent electrons from being able to make a complete circuit.
The statement that eddy currents can be prevented by cutting a slot in a solid conducting plate, to prevent electrons from being able to make a complete circuit is false.
What are eddy currents?Eddy currents are loops of electrical current that are induced within conductive materials when there is a change in magnetic field. When a magnetic field is applied or changes in strength, the eddy currents are produced within the material, which then creates a magnetic field that opposes the original field. This phenomenon is known as electromagnetic induction.
The eddy currents produce a magnetic field that opposes the change in the original magnetic field, which in turn creates resistance to the motion of the original magnetic field. This resistance is called eddy current loss, and it causes the material to heat up.
By cutting a slot in a solid conducting plate can increase the eddy currents because it can create smaller loops within the plate, which can result in more eddy currents being induced. To prevent eddy currents, laminated or layered conductive materials can be used, as the insulation between the layers reduces the current flow and minimizes the eddy currents.
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a charged particle is moving in a uniform, constant magnetic field. Which one of the following statements concerning the magnetic force exerted on a particle is false? a. It does no work on the particle. b. It can act only on a particle in motion. c. It increases the speed of the particle. d. It changes the velocity of the particle. e. It does not change the kinetic energy of the particle.
The false statement concerning the magnetic force exerted on a charged particle moving in a uniform, constant magnetic field is: c. It increases the speed of the particle.
The magnetic force is always perpendicular to the velocity of the charged particle, causing it to change its direction but not its speed. Therefore, it does no work on the particle (a), can act only on a moving particle (b), changes the velocity (d), and does not change the kinetic energy (e). This is because the magnetic force is perpendicular to the velocity of the particle, so it does not do any work on the particle and thus does not increase its kinetic energy. Therefore, the speed of the particle does not increase due to the magnetic force.
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spectral lines from galaxy b are redshifted from their rest wavelengths twice as much as the spectral lines from galaxy a. according to hubble's law, what can you say about their approximate relative distances?
If spectral lines from galaxy b are redshifted from their rest wavelengths twice as much as the spectral lines from galaxy a, it means that galaxy b is approximately twice as far away from us as galaxy a.
According to Hubble's law, the redshift of spectral lines is directly proportional to the distance of the galaxy. Therefore, if spectral lines from galaxy b are redshifted from their rest wavelengths twice as much as the spectral lines from galaxy a, it means that galaxy b is approximately twice as far away from us as galaxy a.
Based on the information given, the spectral lines from Galaxy B are redshifted twice as much as those from Galaxy A. According to Hubble's Law, the redshift of a galaxy is proportional to its distance from the observer. Therefore, we can conclude that Galaxy B is approximately twice as far away from us as Galaxy A.
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: 215) By applying the law of superposition ________ dates can be determined. A) conventional B) radiometric C) relative D) both relative and radiometric
The correct answer is C) Relative dates can be determined by applying the law of superposition.
This law states that in any undisturbed sequence of rocks, the oldest layer is at the bottom and each successive layer is younger than the one beneath it. By examining the relative positions of rock layers and fossils within them, geologists can determine the relative ages of rocks and the fossils they contain. Radiometric dating, on the other hand, involves using the decay of radioactive isotopes to determine the absolute age of a rock or mineral. The law of superposition states that in an undeformed sequence of sedimentary rocks, each layer of sediment is older than the one above it and younger than the one below it. This law is useful for determining the relative ages of sedimentary rocks, but it cannot be used to determine the absolute ages of rocks.
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based on the information, which ,begin emphasis,most,end emphasis, likely happens to a beam of light when it passes through water?answer options with 4 options1.it copies, or duplicates, itself.2.it bends, or changes direction.3.it creates a new light source.4.it is absorbed and disappears.
The correct answer is option it bends, or changes direction. When light passes through water, it undergoes refraction, which causes the beam to bend or change direction. This is due to the change in speed of light as it passes from one medium air to another water.
The information the option that is most likely to happen to a beam of light when it passes through water is: 2. It bends, or changes direction.When you put the idea you want to emphasize in any place other than the stress position, one of two things can happen. First, the reader will realize that the stress position is occupied by something that clearly isn’t worthy of emphasis. In this case, the reader must discern on her own what else in the sentence may be the most likely candidate for emphasis and thus may not interpret your prose as you intended. The chance for misinterpretation gets worse in sentences that are long, dense or sophisticated.
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What do the initial momentsafter the Big Bang have incommon with the universeas it exists now?
The initial moments after the Big Bang and the current universe have a few things in common like Expansion; Radiation; Structure formation; etc.
Expansion: The universe has been expanding since the Big Bang, and this expansion is still happening. The initial moments after the Big Bang were characterized by a period of rapid inflation, and this expansion has continued to shape the structure of the universe we see today.
Radiation: The universe was filled with intense radiation in the initial moments after the Big Bang, and this radiation still exists in the form of the cosmic microwave background (CMB) radiation.
This radiation is thought to have been produced about 380,000 years after the Big Bang and has been traveling through space ever since, providing us with valuable information about the early universe.
Formation of structure: The initial moments after the Big Bang set the stage for the formation of the large-scale structure of the universe we observe today, such as galaxies, stars, and planets. The tiny fluctuations in the density of matter in the early universe were amplified by gravitational attraction over time, leading to the formation of these structures.
However, there are also many differences between the early universe and the universe as it exists now. For example, the universe was much hotter and denser in the early moments after the Big Bang, and there were no stars or galaxies yet.
The universe has also undergone many complex physical processes over billions of years, such as the formation of black holes and the evolution of stars, that were not present in the early universe.
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A resistor and an ideal capacitor are connected in series to an ideal battery having a constant terminal voltage V0. At the moment contact is made with the battery, the voltages across the resistor (VR) and capacitor (VC) are closest to:
At the moment contact is made with the battery, the voltage across the resistor (VR) is initially equal to the terminal voltage V0, while the voltage across the capacitor (VC) is initially zero.
As time passes, the capacitor charges up and its voltage increases while the voltage across the resistor decreases. Therefore, the voltages across the resistor and capacitor are not constant, but are instead time-dependent. However, at very long times, the voltage across the capacitor will approach V0 while the voltage across the resistor will approach zero.
When a resistor and an ideal capacitor are connected in series to an ideal battery with a constant terminal voltage V0, at the moment contact is made with the battery, the voltages across the resistor (VR) and capacitor (VC) are closest to:
VR = V0 and VC = 0
This is because, initially, the capacitor acts like a short circuit, allowing the entire voltage to drop across the resistor. As the capacitor starts charging, the voltage across it will gradually increase, and the voltage across the resistor will decrease accordingly.
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Inquiry Skill
A student constructs a model of a natural resource using a can with a small hole
in the bottom. With the hole plugged, the can is filled with sand. When the plug is
removed, the sand drains out. What kind of resource does this model illustrate?
Relative humidity indicates the:
-chance of cloud formation.
-nearness to saturation for the air.
-actual amount of water in the air.
-chance for evaporation of water.
-probability of precipitation.
Relative humidity indicates the nearness to saturation for the air, which means the amount of water vapor present in the air relative to the maximum amount the air can hold at that temperature. So the correct option is b.
Relative humidity indicates the nearness to saturation for the air. Relative humidity is a measure of the amount of moisture present in the air compared to the maximum amount of moisture the air could hold at a particular temperature, expressed as a percentage. It is a measure of how close the air is to being saturated with moisture. When the relative humidity is 100%, the air is fully saturated and cannot hold any more moisture, which often leads to the formation of clouds or precipitation. Conversely, when the relative humidity is lower, the air has the capacity to hold more moisture before reaching saturation. Relative humidity is an important parameter in weather forecasting, as it can affect various atmospheric processes such as cloud formation, evaporation, and precipitation.
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If the mass of dry air is 2 kg, the mass of water vapor is 10 g, and the volume of a parcel is 1 m^3, what is the mixing ratio of the parcel? What would the mixing ratio be if the volume were to double>
The mixing ratio of the parcel would remain unchanged at 0.005 even if the volume were to double.
The mixing ratio is defined as the ratio of the mass of water vapor to the mass of dry air in a parcel of air.
Given that the mass of dry air is 2 kg and the mass of water vapor is 10 g, we can convert the mass of water vapor to kilograms by dividing by 1000:
Mass of water vapor = 10 g ÷ 1000 = 0.01 kg
The mixing ratio is therefore:
Mixing ratio = Mass of water vapor ÷ Mass of dry air
Mixing ratio = 0.01 kg ÷ 2 kg
Mixing ratio = 0.005
So the mixing ratio of the parcel is 0.005.
If the volume were to double to 2 m^3, the mass of dry air and water vapor in the parcel would remain the same, but the mixing ratio would change because the mass of dry air per unit volume would decrease.
The new mixing ratio can be calculated as follows:
Mass of dry air per unit volume = Mass of dry air ÷ Volume
Mass of dry air per unit volume = 2 kg ÷ 1 m^3 = 2 kg/m^3
New mixing ratio = Mass of water vapor ÷ Mass of dry air per unit volume
New mixing ratio = 0.01 kg ÷ 2 kg/m^3
New mixing ratio = 0.005
So the mixing ratio of the parcel would remain unchanged at 0.005 even if the volume were to double.
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What are the factors that affect the intensity or level of each force?
The intensity or level of each force is affected by various factors such as the magnitude of the force itself, the distance between the objects experiencing the force, the mass of the objects, the direction of the force, the type of force (e.g. gravitational, electromagnetic, etc.), and the presence of any other forces that may be acting on the objects simultaneously.
Additionally, external factors such as temperature, pressure, and humidity can also impact the intensity of certain forces. Ultimately, understanding the factors that influence the intensity of a force is crucial in accurately predicting its effects and determining how it will interact with other forces in a given system.
The factors that affect the intensity or level of each force are:
1. Magnitude: The size or strength of the force influences its intensity. Larger forces generally have a greater impact on the system or objects involved.
2. Direction: The direction in which the force is applied can change the intensity of its effect. Forces acting in opposite directions may counteract each other, while forces acting in the same direction can amplify the overall impact.
3. Distance: The distance between the objects or points where the force is applied can also affect the intensity. In some cases, such as with gravitational,electromagnetic and electrostatic forces, the intensity decreases as the distance between the objects increases.
4. Mass: The mass of the objects involved in the interaction can play a role in determining the intensity of the force. For example, a more massive object will experience a greater gravitational force than a less massive object.
5. Surface properties: The characteristics of the surfaces in contact, such as friction or elasticity, can influence the intensity of the force. Higher friction between two surfaces can result in a greater resistive force, while more elastic surfaces can lead to reduced impact forces.
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Question 70
Resource recovery can be expected to achiever no more than are __ duction in future landfill volume requirement.
a. 50 percent
b. 25 percent
c. 60 percent
d. 40 percent
Resource recovery can be expected to achieve no more than a 50 percent reduction in future landfill volume requirement. So, the correct answer is option a. 50 percent.
Resource recovery refers to the process of extracting useful materials from waste streams and transforming them into new products or energy sources. This can include recycling, composting, and other types of recovery technologies. By recovering resources from waste, the volume of waste that needs to be sent to landfills can be reduced. however, it is important to note that the success of resource recovery programs depends on a variety of factors, including the types of waste being generated, the availability of recovery technologies, and the public's willingness to participate in recycling.
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A. A coach records the distance a runner
travels during 3 different trials. What is the
runners average speed in kilometers per
minute?
Trial
1
2
W|N
3
Time (min)
.
4
3
6
Distance (km)
0.9
1.1
1.5.
B.
tra
Сс
a
The runners average speed in kilometres per minute is 0.269km/min.
How to calculate average speed?The average speed is the rate of motion or action, specifically the magnitude of the velocity; the rate distance is traversed in a given time.
The average speed of a motion can be calculated by dividing the distance moved by the time taken to complete the distance.
According to this question, a runner runs for a total distance of 3.5km at a total time of 13 mins. The average speed in km/min is
Average speed = 3.5km ÷ 13min = 0.269 km/min
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Question 56 Marks: 1 Sandwich and salad mixtures should be placed in shallow pans at a depth not greater than ______ to accelerate the rapid cooling of the food.Choose one answer. a. 3 inches b. 2 inches c. 5 inches d. 8 inches
Option b. Sandwich and salad mixtures should be placed in shallow pans at a depth or height not greater than 2 inches to accelerate the rapid cooling of the food.
Legitimate cooling of food is a fundamental part of food handling and is important to forestall the development of destructive microbes. Shallow dish cooling is a strategy used to quickly cool food things like sandwich and salad combinations. By utilizing shallow dish that are no more profound than 2 inches, the food is presented to rapidly more surface region and cools more.
While cooling food, it means quite a bit to cool it from 135°F to 70°F in something like two hours and from 70°F to 41°F or underneath inside four extra hours to stay away from the peril zone where microbes can quickly duplicate. Utilizing shallow container to cool food to the protected temperature zone all the more rapidly can assist with forestalling the development of hurtful microbes and decrease the gamble of foodborne ailment.
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(250-110) Exposed noncurrent-carrying metal parts likely to become energized must be grounded where within 8 feet vertically or 5 feet horizontally of ground or grounded objects, located in wet or damp locations, or in electrical contact with metal(True/False).
True, Under certain situations of conductors, the National Electric Code (NEC) mandates that exposed noncurrent-carrying metal elements that are likely to become electrified be grounded.
Exposed noncurrent-carrying metal parts that are likely to become electrified must be grounded if they are positioned within 8 feet vertically or 5 feet horizontally of the ground or grounded objects, in moist or damp regions, or in electrical contact with metal, according to NEC 250.4(A)(3).
This criterion is designed to provide a low-impedance conduit for fault current to flow in the case of an electrical failure, therefore protecting against electric shock and preventing equipment damage.
It should be noted that this rule only applies to exposed noncurrent-carrying metal elements, not current-carrying conductors or equipment-grounding conductors.
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31) Where does most star formation occur in the Milky Way today? A) in the halo B) in the bulge C) in the spiral arms D) in the Galactic center E) uniformly throughout the Galaxy
Most star formation in the Milky Way Galaxy today occurs in the Galactic spiral arms. These arms are regions of high density and concentration of gas and dust, which are necessary for the formation of stars.
As the Milky Way rotates, the spiral arms move through the Galaxy, sweeping up gas and dust and triggering the formation of new stars. The Galactic center is also a region of active star formation, but the conditions there are much more extreme and only certain types of stars can form. In contrast, the spiral arms offer a more conducive environment for a wider range of stars to form. Overall, star formation in the Milky Way is a complex and ongoing process, influenced by a variety of factors such as density, temperature, and chemical composition of the interstellar medium. Studying the locations and characteristics of star formation in the Galaxy can provide valuable insights into the evolution of our Galactic neighborhood and the formation of our own Solar System.
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Question 4 (1 point)
Which of the following adjusts the transparency or translucence of a shape or a layer?
A)fill
B)opacity
C)stroke
D)texture
Opacity adjusts the transparency or translucence of a shape or a layer. It is a measure of the degree to which light is allowed to pass through an object. Option B is correct.
The opacity setting is often used in graphic design and image editing software to control the visibility of layers, allowing designers to create interesting visual effects and overlays. When the opacity is set to 100%, the object is completely opaque and does not allow any light to pass through.
When the opacity is set to 0%, the object is completely transparent and allows all light to pass through. Intermediate values of opacity create varying degrees of transparency or translucence, allowing the underlying layers or background to show through to some extent.
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Question 38
All of the following are true about ozone as a disinfectant except which one?
a. Nontoxic to aquatic organisms
b. Source of dissolved oxygen
c. Excellent viricide
d. Long-lasting residual
The correct answer is A. Nontoxic to aquatic organisms. While ozone is an effective disinfectant and viricide, it is not nontoxic to aquatic organisms and can have negative impacts on aquatic life if not used properly.
Ozone can also be a source of dissolved oxygen and have a long-lasting residual effect.
The correct answer is: d. Long-lasting residual
All of the following are true about ozone as a disinfectant except that it has a long-lasting residual. Ozone is nontoxic to aquatic organisms, a source of dissolved oxygen, and an excellent viricide. However, it does not have a long-lasting residual effect, as it decomposes quickly.
A disinfectant is a chemical agent that is used to kill or eliminate harmful microorganisms, such as bacteria, viruses, and fungi, from surfaces, objects, or fluids. Disinfectants are commonly used in hospitals, schools, homes, and other settings to prevent the spread of infectious diseases.
Disinfectants work by disrupting the cell membranes or other structures of microorganisms, leading to their death or inactivation. Some common disinfectants include chlorine bleach, hydrogen peroxide, quaternary ammonium compounds, and alcohol.
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Question 69 Marks: 1 Any excavation in clay, loam, silt or sand more than ______ in depth should have side wall protection to prevent a cave-in.Choose one answer. a. 5 feet b. 4 feet c. 3 feet d. 2 1/2 feet
Any excavation in clay, loam, silt, or sand more than 5 feet in depth should have side wall protection to prevent a cave-in. Therefore, the correct answer is option A) 5 feet.
Excavation work involves digging, moving, or removing soil, rock, or other materials from the ground to create a hole, trench, or foundation for construction or other purposes. Excavation work can be hazardous, particularly when workers enter or work around trenches or excavations.
Cave-ins are one of the most common and deadly excavation hazards. When soil is excavated from the ground, the sides of the excavation can become unstable and collapse, trapping workers underneath. This can cause serious injury or death.
To prevent cave-ins, OSHA (Occupational Safety and Health Administration) requires that all excavations 5 feet or deeper be protected by a protective system. The protective system can be either sloping and benching, shoring, or shielding. Sloping and benching involve cutting back the sides of the excavation to create a slope or series of steps to prevent cave-ins. Shoring involves installing supports, such as hydraulic or mechanical braces, to prevent cave-ins. Shielding involves using trench boxes or other types of protective systems to prevent soil from falling or rolling into the excavation.
In addition to using protective systems, it is important to conduct regular inspections of the excavation site, to train workers on safe excavation practices, and to implement a rescue plan in case of an emergency. Following these safety procedures can help prevent cave-ins and other excavation-related accidents, and ensure the safety of workers on the job site.
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1,400 g
12 kg
Which is greater
Answer:
12kg is greater because 12kg is 12000g
Answer:
12kg is the answer cause if it wasn't 12 kg then 1,400 g would not be the answer so you would pick 12kg as the answer.
the specific heats of several metals are given in the table. if the same number of joules were applied to the same mass of each metal, which metal would show the greatest temperature change?
The specific heat of a substance is defined as the amount of heat energy required to raise the temperature of one unit of mass of the substance by one degree Celsius (or one Kelvin).
As a result, given the same level of energy input, the material with the smallest amount of specific warmth will experience the largest temperature change. We can see through the table of metal specific heats that copper, exhibiting a value of 0.385 J/g°C, is the metal with the smallest specific heat.
So, among the metals presented in the table, metal would experience the largest rise in temperature whether the same quantity of joule were put to the identical amount of each metal.
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Correct Question:
The specific heats of several metals are given in the table. if the same number of joules were applied to the same mass of each metal, which metal would show the greatest temperature change?
Question 5 Marks: 1 Excessive condensation, corrosion, and mildew occur when the relative humidity exceedsChoose one answer. a. 20 percent b. 40 percent c. 80 percent d. 60 percent
The correct answer is c. 80 percent. When the relative humidity exceeds 80 percent, the air is saturated with moisture and cannot hold any more water vapor.
This leads to excessive condensation on surfaces, which can promote the growth of mildew and cause corrosion over time. It is important to monitor humidity levels in indoor spaces to prevent these issues.
Excessive condensation, corrosion, and mildew occur when the relative humidity exceeds 60 percent (option d).
A humidity sensor is a device that detects, measures, and reports the relative humidity (RH) of air or determines the quantity of water vapor present in a gas mixture (air) or pure gas.
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Question 10
Which one of the following is not natural source of radiation exposure?
a. Radioactive minerals
b. Cosmic radiation
c. Nuclear power plants
d. plants
Nuclear power plants is not a natural source of radiation exposure. Option (c) is correct.
Radiation exposure can occur from both natural and man-made sources. Options (a) radioactive minerals and (b) cosmic radiation are natural sources of radiation exposure. Radioactive minerals such as uranium and radon can be found in rocks, soil, and building materials, while cosmic radiation comes from the sun and other stars.
Option (d) plants can also be a natural source of radiation exposure due to naturally occurring radioactive isotopes in the soil. However, nuclear power plants are not a natural source of radiation exposure as they use man-made processes to generate nuclear power, which can result in the release of radioactive materials. Option (c) is correct.
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1. Complete the following statement: The angular measure 1.0 radian is equal to
A) 0.0175°.
B) 57.3°.
C) 1.57°.
D) 3.14°.
E) 6.28°.
The correct answer is B) 57.3°. This is because a radian is a unit of angular measure defined as the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.
Angular measure is a unit of measurement used to describe an angle or the amount of rotation from a fixed point. It is typically expressed in units of degrees, minutes, and seconds. To convert radians to degrees, you can use the conversion factor: 1 radian = (180/π) degrees.
1.0 radian * (180/π) = 57.3°
So, the angular measure 1.0 radian is equal to: B) 57.3°.
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Question 76
When trying to establish economical hauling, what is most important?
a. hauling time
b. hauling distance
c. means of hauling
d. what is being hauled
When trying to establish economical hauling, hauling distance is usually the most important factor to consider. Hauling distance refers to the point of origin and the destination of the goods being transported.
The farther the distance, the higher the cost of transportation, as it requires more time, fuel, and resources to haul the goods. While other factors such as hauling time, means of hauling, and what is being hauled can also impact the cost and efficiency of transportation, the distance typically has the most significant impact on the overall cost. Therefore, it is crucial to consider the hauling distance when trying to establish an economical hauling plan. To minimize the cost of transportation, various strategies can be employed, such as optimizing the routing to reduce the distance traveled, utilizing more efficient means of transportation, such as rail or water transport, and using technology to improve logistics and reduce waste. Ultimately, the goal of establishing an economical hauling plan is to minimize transportation costs while ensuring that goods are delivered safely, reliably, and on time. By prioritizing hauling distance and utilizing efficient transportation strategies, businesses can achieve a more cost-effective and sustainable transportation plan.
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