Answer:
don't know
Explanation:
don't know cause i don't read physic
Answer:
Study of static electricity and the condition under which electricity is conducted by different substances.
You have 16 kg of a radioactive sample with a certain half-life of 15 years. How much is left after 60 years?A. 8 kgB. 4 kgC. 2kgD. 1kgE. nothing
Given 16 kg of a radioactive sample with a certain half-life of 15 years:
To determine how much of the 16 kg radioactive sample is left after 60 years with a half-life of 15 years, we will use the following steps:
1. Calculate the number of half-lives that have passed: 60 years / 15 years per half-life = 4 half-lives
2. Calculate the remaining sample amount using the formula: remaining amount = initial amount * (1/2)^number of half-lives
3. Apply the formula: remaining amount = 16 kg * (1/2)^4 = 16 kg * 1/16 = 1 kg
After 60 years, 1 kg of the radioactive sample is left. The correct answer is D. 1kg.
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a vector has an x component of -309m and a y component of 187m find the direction of the vector
The direction of the vector is approximately 330.06 degrees.
To find the direction of a vector given its components, we can use trigonometry. The direction of a vector is typically represented by an angle measured counterclockwise from the positive x-axis.
Let's denote the x-component as x = -309 m and the y-component as y = 187 m. To find the direction, we can calculate the tangent of the angle using the formula:
θ = arctan(y/x)
Substituting the given values, we have:
θ = arctan(187/-309)
Using a scientific calculator or trigonometric tables, we find that the arctan of this ratio is approximately -30.06 degrees.
Since the direction is measured counterclockwise from the positive x-axis, we can express the direction as 360 degrees minus the calculated angle. In this case, the direction is approximately 330.06 degrees.
Therefore, the direction of the vector is approximately 330.06 degrees.
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Which of these best describes the relationship between the incident ray, the reflected ray, and the normal for a curved mirror?(1 point)
Responses
The angle that the incident ray makes with the normal is the same as the angle that the reflected ray makes with the normal. All points on a curved mirror have the same normal.
The angle that the incident ray makes with the normal is the same as the angle that the reflected ray makes with the normal. All points on a curved mirror have the same normal.
The angle that the incident ray makes with the normal is different than the angle that the reflected ray makes with the normal. All points on a curved mirror have the same normal.
The angle that the incident ray makes with the normal is different than the angle that the reflected ray makes with the normal. All points on a curved mirror have the same normal.
The angle that the incident ray makes with the normal is different than the angle that the reflected ray makes with the normal. Different points on a curved mirror have a different normal.
The angle that the incident ray makes with the normal is different than the angle that the reflected ray makes with the normal. Different points on a curved mirror have a different normal.
The angle that the incident ray makes with the normal is the same as the angle that the reflected ray makes with the normal. Different points on a curved mirror have a different normal.
The angle that the incident ray makes with the normal is the same as the angle that the reflected ray makes with the normal. Different points on a curved mirror have a different normal.
For curved mirror, all points have same normal and angle of incidence is also equal to angle of reflection.
What is curved mirror?A curved mirror is a mirror with curved reflecting surface and the surface may be convex or concave. Most of the curved mirrors have surfaces that are shaped like part of sphere but other shapes are sometimes used in the optical devices.
For a curved mirror, all points have same normal and the angle of incidence is also equal to angle of reflection. According to the laws of reflection, incident ray, reflected ray and normal all lie on same plane. For curved mirror, normal remains the same at all points along the curved mirror.
Angle made between the incident ray and normal is the same as the angle made between reflected ray and the normal. Therefore, angle of reflection is equal to the angle of incidence.
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Conductivity unit of measure
A) ions
B) siemen/cm
C) nobles/cm
D) ohms/cm
E) amps
The unit of measure for conductivity is Siemens per centimeter (S/cm). Conductivity is a measure of the ability of a material to conduct electrical current. It is defined as the reciprocal of electrical resistance, which is measured in ohms. Conductivity is a property that is dependent on the concentration and mobility of ions present in a solution or material.
The conductivity of a material is measured by applying a potential difference across it and measuring the resulting current flow. The conductivity can then be calculated using Ohm's law, which relates the potential difference, current, and resistance of a material. Conductivity is an important parameter in many applications, including water quality testing, industrial processes, and electronics. In water quality testing, conductivity is used to measure the concentration of dissolved ions in water, which can indicate the level of pollution or contamination. In industrial processes, conductivity is used to monitor the quality of liquids and ensure that they meet certain specifications. In electronics, conductivity is a critical parameter for designing and manufacturing electronic components and circuits. In summary, conductivity is an important property that is measured using Siemens per centimeter (S/cm). It is a measure of the ability of a material to conduct electrical current and is dependent on the concentration and mobility of ions present in the material.
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which set of environmental forces can have a radical and rapid impact on distribution strategy?
The set of environmental forces that can have a radical and rapid impact on distribution strategy includes technological advancements, regulatory changes, and market disruptions.
Technological advancements, such as e-commerce and automated logistics systems, can rapidly disrupt traditional distribution channels. Companies must adapt their strategies to leverage new technologies and meet changing consumer preferences.
Regulatory changes, such as trade policies or transportation regulations, can suddenly impact distribution strategies. Companies may need to modify their networks or find alternative routes to market due to new laws or restrictions.
Market disruptions, including shifts in consumer behavior, economic downturns, or natural disasters, can require quick reevaluation of distribution channels and supply chain resilience for business continuity.
These forces necessitate agile and adaptive distribution strategies to remain competitive and effectively respond to changing circumstances in the marketplace.
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Consider a gas with two components, A and B. Gas A has a partial pressure of 50 psi while gas B has a partial pressure of 45 psi. If gas A has a molar mass of 25 g/ mole and gas B has a molar mass of 20 g/mole, find the mole and mass fractions of gas A and gas B. Step 1 What is the total pressure, in psi?
Total pressure = Partial pressure of gas A + Partial pressure of gas B=50+45=95 psi.
The mole fraction of gas A is 0.357 and the mole fraction of gas B is 0.643. The mass fraction of gas A is 0.412 and the mass fraction of gas B is 0.588.
To find the mole and mass fractions of gas A and gas B, we need to use their partial pressure and molar mass. The mole fraction of gas A can be calculated as follows:
Mole fraction of gas A = Partial pressure of gas A / Total pressure
Mole fraction of gas A = 50 psi / 95 psi
Mole fraction of gas A = 0.5263
Similarly, the mole fraction of gas B can be calculated as follows:
Mole fraction of gas B = Partial pressure of gas B / Total pressure
Mole fraction of gas B = 45 psi / 95 psi
Mole fraction of gas B = 0.4737
Now, we can calculate the mass fraction of gas A using its mole fraction and molar mass. The mass fraction of gas A is defined as the mass of gas A divided by the total mass of the mixture:
Mass fraction of gas A = (Mole fraction of gas A × Molar mass of gas A) / (Mole fraction of gas A × Molar mass of gas A + Mole fraction of gas B × Molar mass of gas B)Mass fraction of gas A
= (0.5263 × 25 g/mol) / (0.5263 × 25 g/mol + 0.4737 × 20 g/mol)
Mass fraction of gas A = 0.4118
Similarly, we can calculate the mass fraction of gas B using its mole fraction and molar mass:
Mass fraction of gas B = (Mole fraction of gas B × Molar mass of gas B) / (Mole fraction of gas A × Molar mass of gas A + Mole fraction of gas B × Molar mass of gas B)
Mass fraction of gas B = (0.4737 × 20 g/mol) / (0.5263 × 25 g/mol + 0.4737 × 20 g/mol)
Mass fraction of gas B = 0.5882
Therefore, the mole fraction of gas A is 0.357 and the mole fraction of gas B is 0.643. The mass fraction of gas A is 0.412 and the mass fraction of gas B is 0.588.
The mole and mass fractions of gas A and gas B in the given mixture are calculated to be 0.357, 0.643 and 0.412, 0.588 respectively.
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How do you calculate total kinetic energy for an object that is rotating about its axis and moving linearly?
Therefore, the total kinetic energy of the object is: KE = KL + KR = 1/2 mv² + 1/2 Iω².
What is kinetic energy?Kinetic energy is the energy of a body or a system due to its motion. It is the energy associated with the movement of an object or a particle. Kinetic energy can be described as the energy of an object because of its motion. It is the energy that an object has because of its movement. Kinetic energy is the energy of a system due to the motion of its parts. It is the energy associated with the relative motion between two or more objects. Kinetic energy is a type of mechanical energy, which is energy associated with the motion of an object.
The total kinetic energy of a rotating and moving object is the sum of the linear kinetic energy (KL) and the rotational kinetic energy (KR).
KL= 1/2 mv²
KR= 1/2 Iω²
Where m is the mass of the object, v is the linear velocity, I is the rotational inertia, and ω is the angular velocity.
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What does intensity mean in relation to Fitt )?
define 1 standard meter
Explanation:
The standard meter is the length of the path travelled by the light in vacuum during a time interval of 1/299792 of a second. The meter is the length of the path travelled by light in vacuum during a time interval of 1/299792 of a second. 1 m is about 39.37 inches.
Whispering Gallery: A hall 100 feet in length is to be designed as a whispering gallery. If the foci are located 25 feet from the center, how high will the ceiling be at the center?
The height of the ceiling at the center of the whispering gallery is approximately 43.3 feet.
In an ellipse, the sum of the distances from any point on the ellipse to its two foci is constant. In this case, the two foci are located 25 feet from the center of the hall.
Given that the hall is 100 feet in length, the distance from one end to the center is 50 feet. We can consider this as the semi-major axis (a) of the ellipse.
The sum of the distances from any point on the ellipse to its two foci is equal to 2a. Thus, the sum of the distances from the ceiling at the center of the hall to the two foci is also 2a.
Since the foci are located 25 feet from the center, the sum of the distances is 2a = 50 feet.
To find the height of the ceiling at the center, we need to determine the semi-minor axis (b) of the ellipse. The semi-minor axis can be calculated using the formula:
b = √(a² - c²)
where c represents the distance from the center to each focus. In this case, c = 25 feet.
Substituting the values into the formula:
b = √(50² - 25²)
b = √(2500 - 625)
b = √(1875)
b = 43.3 feet
Therefore, the height of the ceiling at the center of the whispering gallery is approximately 43.3 feet.
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you are on a committee that is planning whether or not to build a dam on a nearby river to produce hydroelectric power. describe some of the advantages and disadvantages you should consider before deciding to build the dam.
The answers include the following:
The advantages you should consider before deciding to build the dam is that it helps in the control of flood and it serves as a source of water supply.The disadvantages you should consider before deciding to build the dam is that it disrupts local ecosystems and also displaces people.What is a Dam?This is referred to as a barrier which restricts the flow of surface water and has different importance which include the generation of electricity through the wind turbines.
The dam uses the water current to move the turbines and there are some advantages which should be considered before it is constructed such as the control of flood and as a source of water supply.
Disadvantages such as local ecosystem disruption should also be considered so as to protect species and ensure that they don't go extinct.
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what is the weight of a 225-kg space probe on the moon? the acceleration of gravity on the moon is 1.62 m/s2.
Answer:
The weight of the 225-kg space probe on the moon is 364.5 N (newtons).
Explanation:
To calculate the weight of the space probe on the moon, we can use the formula:
weight = mass x acceleration due to gravity
where mass is given as 225 kg and acceleration due to gravity on the moon is 1.62 m/s^2.
weight = 225 kg x 1.62 m/s^2
weight = 364.5 N
Therefore, the weight of the 225-kg space probe on the moon is 364.5 N (newtons).
A book rest on a table which it's face having a sides 30cm by 25cm . if it exerts apressure of 200pa then determine the mass of the block.
Answer:
m = 1.53 kg
Explanation:
Given that,
The sides of a book are 30cm by 25cm.
Pressure exerted, P = 200 Pa
We need to find the mass of the block. We know that,
Pressure = Force/area
So,
\(P=\dfrac{mg}{A}\\\\m=\dfrac{PA}{g}\)
Put all the values,
\(m=\dfrac{200\times 0.3\times 0.25}{9.8}\\\\m=1.53\ kg\)
So, the mass of the block is 1.53 kg.
Explain tectonic factors that affect the amount of fossil fuels found in an area.
Answer:Fossil fuels are formed from the remains of plants and animals that lived millions of years ago. The amount of fossil fuels found in an area is influenced by several tectonic factors, including:
Depositional environment: The type of depositional environment where organic material was deposited affects the type and quantity of fossil fuels that are formed. For example, organic material deposited in marine environments may form oil, while organic material deposited in peat bogs or swamps may form coal.
Tectonic setting: Tectonic activity, such as plate movements, can affect the accumulation and preservation of organic material. For example, areas with active tectonic activity may have more uplift and erosion, which can result in the destruction of organic material before it can be buried and preserved.
Sedimentary basin characteristics: The size, depth, and shape of a sedimentary basin can also affect the amount of fossil fuels that are formed. For example, large, deep basins with thick layers of sedimentary rock may have a greater potential for oil and gas formation compared to smaller, shallower basins.
Source rock properties: The properties of the source rock, such as its organic content, mineral composition, and permeability, also influence the amount and type of fossil fuels that are formed. Rocks with higher organic content and better permeability are more likely to generate and retain larger amounts of fossil fuels.
Migration pathways: Once fossil fuels are formed, they must migrate through the surrounding rock to accumulate in economically viable amounts. The presence of faults, fractures, and other permeable structures can facilitate the migration and accumulation of fossil fuels in a particular area.
In summary, the amount of fossil fuels found in an area is affected by a combination of geological and tectonic factors that influence the formation, preservation, and accumulation of organic material over millions of years.
Explanation:
Un punto se ubica en un sistema de coordenadas polar por las coordenadas r = 7.6 m y = 30°. Encuentre las coordenadas x y y de este punto (en m), suponiendo que los dos sistemas de coordenadas tienen el mismo origen.
Answer:
Las coordenadas del punto son \((x,y) = (6.582\,m, 3.8\,m)\).
Explanation:
La relación entre un vector en formato polar y uno con formato rectangular con respecto al mismo origen queda sintetizado por la siguiente expresión:
\((x, y) = r\cdot (\cos \theta, \sin \theta)\) (1)
Donde:
\(r\) - Magnitud de la distancia del punto con respecto al origen, medido en metros.
\(\theta\) - Dirección del punto con respecto del semieje +x, medido en grados sexagesimales.
\(x,y\) - Coordenadas rectangulares del punto con respecto al origen, medidas en metros.
Si sabemos que \(r = 7.6\,m\) y \(\theta = 30^{\circ}\), entonces las coordenadas rectangulares del punto con respecto al origen son:
\((x,y) = (7.6\,m)\cdot (\cos 30^{\circ}, \sin 30^{\circ})\)
\((x,y) = (6.582\,m, 3.8\,m)\)
Las coordenadas del punto son \((x,y) = (6.582\,m, 3.8\,m)\).
What phenomenon in hearing is analogous to spatial frequency channels in vision?
A. critical bands
B. tonal suppression
C. auditory adaptation
D. the volley principle
The phenomenon in hearing that is analogous to spatial frequency channels in vision is critical bands. Hence, the correct option is A: Critical bands.
Critical bands are regions of the audible frequency range in which a complex sound is divided into individual, discrete frequency bands by the human auditory system.
For instance, when different frequencies in a complex sound, such as a musical instrument or a human voice, are picked up by the ear, they are sent to the brain via various channels that respond to specific frequencies.
These channels are referred to as critical bands. The frequency range of these bands varies depending on the loudness of the sound.
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A planet's moon travels in an approximately circular orbit of radius 8.6 107 m with a period of 6 h 25 min. Calculate the mass of the planet from this information.
Answer:
m v^2 / R = G M m / R^2 gravitational attraction = centripetal force
M = v^2 R / G solving for M
period = 6 h 25 min = (6 * 3600 + 25 * 60) sec = 23,100 sec = T
v = 2 pi R / T
M = 4 pi^2 R^3 / (G T^2)
M = 39.5 * (8.6E7)^3 / (6.67E-11 * 2.31E4^2)
M = 39.5 * 636 / (6.67 * 5.34) * 10^24
M = 7.05 * 10^26 kg
13. Which one of the colors has the longest wavelength A, Red B. Yellow C. Blue 14. The sky appears blue due to A. Diffraction of light C. Refraction of light B. Reflection of light D. Scattering of light
13.The color with the longest wavelength is option A. Red.
14.The sky appears blue due to option D. Scattering of light.
Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.
The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.
The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day. The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.
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An electric motor has a power rating of 1.60 kW and operates at 75% efficiency. The amount of work that it can do in 1.0
hrs is__ x10^6J. Give your answer with the correct number of sig digs and do not include units)
Answer: 4.3 x 10^6 J
Explanation: P= W/t so W=Pt.
The power here is 1600 J/s (1.6 kW) and the time is 3600s (1 hour x 60 mins x 60 seconds).
1600x3600 = 5760000 J (5.76 x 10^6 J).
Efficiency = Eout/Ein so Eout = Efficiency x Ein.
(0.75) x (5.76 x 10^6) = 4.3x10^6 J.
A 230 v mains powered electrical drill draws a current of 2.5 A calculate the power of the drill at use
Table salt is made up of one sodium atom and one chlorine atom. Is table salt an element
The switching frequency of the converter is 5 khz, the inductor is 200 uh, what is the maximum peak-peak current ripple of the converter? at this condition, what is the power output of the converter?
1. We can calculate the maximum peak-to-peak current ripple:
ΔI = (Vin * Ton) / (2 * L)
2. We can find the power output using the formula:
Pout = 0.5 * Vin * IL
1 To calculate the maximum peak-to-peak current ripple in a converter, we can use the formula:ΔI = (Vin * Ton) / (2 * L)
Where:
ΔI is the maximum peak-to-peak current ripple
Vin is the input voltage to the converter
Ton is the on-time of the switching cycle
L is the value of the inductance
We have,
Switching frequency = 5 kHz
Inductor value = 200 μH
To calculate the on-time (Ton), we can use the formula:
Ton = 1 / (2 * switching frequency)
Substituting the given values, we have:
Ton = 1 / (2 * 5000) = 10 μs
Now we can calculate the maximum peak-to-peak current ripple:
ΔI = (Vin * Ton) / (2 * L)
However, the input voltage (Vin) is not provided in the question. Please provide the input voltage value so that we can calculate the maximum peak-to-peak current ripple.
2. To calculate the power output of the converter, we need to know the input voltage (Vin) and the current flowing through the inductor (IL). With the given information:
Switching frequency = 5 kHz
Inductor value = 200 μH
We can find the power output using the formula:
Pout = 0.5 * Vin * IL
However, the current flowing through the inductor (IL) is not provided in the question. The inductor current depends on the specific circuit configuration and the load connected to the converter. Please provide the current flowing through the inductor (IL) so that we can calculate the power output of the converter.
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Which two types of waves require matter in order to travel? A. Light waves B. Sound waves C. Electromagnetic waves D. Water waves
Answer:
b & c
Explanation:
because is my choice
When an apple falls towards the earth,the earth moves up to meet the apple. Is this true?If yes, why is the earth's motion not noticeable?
Yes, this is true.
-- While the apple is falling, the same gravitational force acts on both the apple and the Earth.
-- The mass of the apple is somewhere in the neighborhood of 1/4 kg.
-- The mass of the Earth is about 5.972 x 10²⁴ kg.
-- Since the Earth has roughly 2.389 x 10²⁶ times as much mass as the apple has, the apple has roughly 2.389 x 10²⁶ greater acceleration than the Earth has, and moves roughly 2.389 x 10²⁶ times as far down as the Earth moves up, before they smack together.
-- That's why you don't notice the Earth's motion.
-- Also, you're standing on the Earth, moving up with it, toward the apple. Maybe it would be different if you were sitting on the apple, riding it down to the ground, and you were able to notice the motion of the ground coming up to meet you at a speed that's 0.00000000000000000000000000419 of YOUR speed.
According to Newton's third law, action and reaction are equal and opposite.
There is a gravitational force of attraction that acts between then falling apple and the earth. The magnitude of acceleration imparted by this force determines which of the bodies (the apple or the earth) will have a larger magnitude of acceleration.
Given that the acceleration imparted on the apple and the earth by the gravitational force F is;
a = F/m
where m is the mass of the object.
We can easily see that the earth has a much larger mass than the apple hence the magnitude of acceleration imparted to the apple by this force is much larger the magnitude of acceleration imparted to the earth by the same force.
Hence, we can see the apple moving but not the earth.
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what is equal and opposite, according to newton's third law? responses A. change in acceleration change in acceleration reaction reaction change in velocity change in velocity action
The equal and opposite, according to Newton's third law is when one object exerts a force on another object, the second object will exert an equal and opposite force on the first object.
The force pairs act on different objects, but they are always equal in strength and opposite in direction. Newton's Third Law of Motion states that every action has an equal and opposite reaction. The law means that there is a pair of forces acting on two different objects. The two forces are equal in magnitude but opposite in direction. Therefore, when two objects are interacting, they are always pushing and pulling on each other with equal force.
In simpler words, this law states that when you push against an object, the object pushes back on you with an equal amount of force. The force pairs act on different objects, but they are always equal in strength and opposite in direction. This law is fundamental to understanding the movement of objects in the universe. So therefore the equal and opposite, according to Newton's third law is when one object exerts a force on another object, the second object will exert an equal and opposite force on the first object.
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In an automobile accident where a small car hits a large truck, the front end of the car was 1. 6 m long and 1. 3 m of it was completely crushed as the small car came to an abrupt stop. If the car was travelling at 60 m/s before hitting the truck. What was the average deceleration felt by the driver?
The average deceleration felt by the driver was approximately 26.67 m/s². to calculate the average deceleration, we can use the equation of motion:
v² = u² + 2as
where:
v = final velocity (0 m/s, since the car came to a stop)
u = initial velocity (60 m/s)
a = average deceleration
s = displacement (1.3 m, the distance the front end of the car was crushed)
Rearranging the equation, we have:
a = (v² - u²) / (2s)
Substituting the values:
a = (0 - 60²) / (2 * 1.3)
a ≈ -26.67 m/s² (negative sign indicates deceleration)
Therefore, the average deceleration felt by the driver was approximately 26.67 m/s². This means that for every second the car was in contact with the truck, its speed reduced by an average of 26.67 meters per second.
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If you build a common source amplifier with NMOS input transistor and we want a current source as a load and that current source goes from VDD to a node so what would be the type of the current source?
If you build a common-source amplifier with an NMOS input transistor, and you want a current source as a load, and that current source goes from VDD to a node, the type of current source would be the diode-connected transistor.
An NMOS current source implemented as a diode-connected transistor is a type of bipolar transistor circuit that creates a constant current from an input voltage. The collector and emitter of the bipolar transistor are connected together in the circuit, effectively turning the transistor into a diode. The main advantage of diode-connected transistors is that they can generate currents of a specific magnitude and not be influenced by changes in the supply voltage.
The current generated by the diode-connected transistor is almost completely determined by the physical characteristics of the transistor and the biasing resistors used in the circuit. Another advantage of diode-connected transistors is that they may be cascaded in series to create current sources of various sizes. These devices have been commonly used to generate reference currents, voltage-to-current (V-I) converters, and bias currents in linear integrated circuits. So therefore diode-connected transistor is the type of current source, if you build a common-source amplifier with an NMOS input transistor, and you want a current source as a load, and that current source goes from VDD to a node.
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We repeat the experiment from the video, but this time we connect the wires in parallel rather than in series. Which wire will now dissipate the most heat? View Available Hint(s) We repeat the experiment from the video, but this time we connect the wires in parallel rather than in series. Which wire will now dissipate the most heat? The copper wire (resistance 0.1 Ω ) Both wires will dissipate the same amount of heat. The Nichrome wire (resistance 2.7 Ω ) Submit Provide Feedback Next
Answer:
The copper wire (resistance 0.1 Ω )
Explanation:
In a parallel connection, the same voltage is maintained across all the resistors but the current varies.
The larger the magnitude of the resistance, the smaller the current flowing in the circuit and the smaller the heat dissipated by the resistor.
Hence the copper wire dissipates the greatest heat.
A 40.0 kg box is placed on a 2.00 m tall shelf. If the box falls off the shelf, what is its kinetic energy as it strikes the ground?
Write an argument of any one
Do you think parallel universes exist?
or
Do you think portals exist?