Suppose you have the following circuit diagram.
Here R1=22kΩ, R2=33kΩ, R3=1.1kΩ, R4=3.3kΩ, R5=33kΩ, R6=11kΩ, R7=33kΩ, R8=1.1kΩ, R9=
3.3kΩ are the resistances on the circuit where kΩ stands for kilo ohm. The electromotive forces
of the batteries are E1=3volts and E2=6volts.
Figure 1
a) Calculate Rbk, the resistance equivalent to R5, R6, R7, R8, and R9 between the
terminals b and k.
b) Calculate the current through R1.
c) Calculate the current through Rbk and call it Ibk.
d) Calculate the power dissipated by the R2 resistor.
e) Calculate the potential difference across the oc terminal.
Answers
Answer:
a) To calculate the resistance equivalent to R5, R6, R7, R8, and R9 between the terminals b and k, we can use the formula for the resistance of a parallel circuit:
1/Rbk = 1/R5 + 1/R6 + 1/R7 + 1/R8 + 1/R9
Plugging in the values of the resistances, we get:
1/Rbk = 1/33kΩ + 1/11kΩ + 1/33kΩ + 1/1.1kΩ + 1/3.3kΩ = 0.03 + 0.09 + 0.03 + 0.009 + 0.003 = 0.154
Therefore, the resistance equivalent to R5, R6, R7, R8, and R9 between the terminals b and k is Rbk = 1/0.154 = 6.49kΩ.
b) To calculate the current through R1, we can use Ohm's law:
I = V/R
where I is the current, V is the potential difference, and R is the resistance. In this case, the potential difference is the electromotive force of the battery, which is 3 volts, and the resistance is the resistance of R1, which is 22kΩ. Plugging these values into the formula, we get:
I = 3V/22kΩ = 0.136mA
Therefore, the current through R1 is 0.136mA.
c) To calculate the current through Rbk, we can use Ohm's law again:
Ibk = V/Rbk
where Ibk is the current through Rbk, V is the potential difference, and Rbk is the resistance of Rbk, which we calculated in part (a) to be 6.49kΩ. In this case, the potential difference is the electromotive force of the battery, which is 3 volts. Plugging these values into the formula, we get:
Ibk = 3V/6.49kΩ = 0.464mA
Therefore, the current through Rbk is 0.464mA.
d) To calculate the power dissipated by the R2 resistor, we can use the formula for power:
P = I^2 * R
where P is the power, I is the current, and R is the resistance. In this case, the current is the current through R2, which is the same as the current through R1 because they are in series. We calculated the current through R1 to be 0.136mA in part (b). The resistance is the resistance of R2, which is 33kΩ. Plugging these values into the formula, we get:
P = (0.136mA)^2 * 33kΩ = 0.0023W
Therefore, the power dissipated by the R2 resistor is 0.0023W.
e) To calculate the potential difference across the oc terminal, we can use Ohm's law:
V = I * R
where V is the potential difference, I is the current, and R is the resistance. In this case, the current is the current through the oc terminal, which is the same as the current through R1 and R2 because they are in series. We calculated the current through R1 to be 0.136mA in part (b). The resistance is the total resistance of the circuit between the oc
A. Rbk is 32.967 kΩ, B. The current through R1 is 0.409 mA, C. The current through Rbk is Ibk = I2, D. The power dissipated by the R2 resistor is -0.48 mW, and E. The potential difference across the oc terminal is 8.638 V.
What is Resistance?Resistance is the opposition that a material or a device offers to the flow of electric current. It is typically represented by the symbol "R" and measured in units of ohms (Ω). The resistance of a material or device depends on factors such as its geometry, temperature, and the material properties of its components. In a circuit, the resistance can limit the flow of current, and it can be used to control the amount of current that flows through a component.
Here in the Question,
A) To calculate Rbk, we can use the formula for resistors in parallel:
1/Rbk = 1/R5 + 1/R6 + 1/R7 + 1/R8 + 1/R9
1/Rbk = 1/33kΩ + 1/11kΩ + 1/33kΩ + 1/1.1kΩ + 1/3.3kΩ
1/Rbk = 0.0000303 Ω^-1
Rbk = 32.967 kΩ (rounded to three significant figures)
B) To calculate the current through R1, we can use Ohm's Law:
V = IR
where V is the voltage (in volts), I is the current (in amperes), and R is the resistance (in ohms).
The voltage across R1 is E1 + E2 = 3 V + 6 V = 9 V.
So, the current through R1 is:
I1 = V/R1 = 9 V / 22 kΩ = 0.409 mA (rounded to three significant figures)
C) To calculate the current through Rbk, we can use Kirchhoff's Current Law:
The total current entering a node is equal to the total current leaving the node.
Since there are only two paths for current to flow from the positive terminal to the negative terminal of the circuit, the current through Rbk is the same as the current through R2. So, Ibk = I2.
D) To calculate the power dissipated by the R2 resistor, we can use the formula for power:
P = IV
where P is power (in watts), I is current (in amperes), and V is voltage (in volts).
The voltage across R2 is E2 = 6 V (since it is connected in series with the positive terminal of the battery).
So, the current through R2 is:
I2 = (E1 - E2)/R1 + R2 = (3 V - 6 V)/22 kΩ + 3.3 kΩ = -0.08 mA
(Note that the negative sign indicates that the current is flowing in the opposite direction of the assumed direction.)
The power dissipated by R2 is:
P2 = I2V2 = (-0.08 mA)(6 V) = -0.48 mW
(Note that the negative sign indicates that the power is being supplied to the circuit rather than being dissipated.)
E) To calculate the potential difference across the oc terminal, we need to find the voltage at point o relative to point c. This can be done by finding the voltage drop across R5, R6, R7, R8, and R9 and subtracting it from the voltage across the battery E2:
Voc = E2 - (Ibk * Rbk)
From part (a), Rbk = 32.967 kΩ, and from part (c), Ibk = I2 = -0.08 mA.
So, Voc = 6 V - (-0.08 mA * 32.967 kΩ) = 8.638 V (rounded to three significant figures).
Therefore, A. Rbk = 32.967 kΩ, B. The current through R1 is 0.409 mA, C. The current through Rbk is Ibk = I2, D. The power dissipated by the R2 resistor is -0.48 mW, and E. The potential difference across the oc terminal is 8.638 V.
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Related Questions
A glass window of width W 1 m and height H 2 m is 5 mm thick and has a thermal conductivity of kg 1.4 W/mK. If the inner and outer surface temperatures of the glass are 15 C and 20 C, respectively, on a cold winter day, what is the rate of heat loss through the glass
Answers
Answer:
Explanation:
Rate of heat conduction is given by the formula
Q = KA(T₂ -T₁ ) / L
where K is a constant called thermal conductivity , A is surface area , (T₂ -T₁ ) is temperature difference and L is thickness of glass . Q is heat conducted per unit time .
Putting the given values in the equation
Q = 1.4 x 1 x 2 x ( 20 - 15) / .005
= 2800 J per second .
Q
LESSION 7:LIGHT UNIT TEST
PHYSICAL SCIENCE B: UNIT 4: LIGHT
17/17 answers u cheaters here you go
Answers
Answer:
I cheated on
Spanish
ELA
history
Explanation:
Answer:
thx
Explanation:
Some dragonflies splash down on the surface of a lake and then fly upward, spinning rapidly to spray the water off their bodies. When the dragonflies spin, they tuck themselves into a "ball." They spin with a linear speed of 2.4 m/s m / s and produce a centripetal acceleration of 230 m/s2 m / s 2 .
Answers
The radius of the circle the dragonflies are spinning in is 0.025 meters.
Steps
The linear speed of the spinning dragonflies is 2.4 m/s.
The centripetal acceleration they produce is 230 m/s².
We can use the formula for centripetal acceleration:
a = v²/r
where a is the centripetal acceleration, v is the linear speed, and r is the radius of the circle.
Rearranging this formula, we get:
r = v²/a
r = (2.4 m/s)² / 230 m/s²
r = 0.025 m
Therefore, the radius of the circle the dragonflies are spinning in is 0.025 meters.
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A fishing boat leaves a marina with a constant speed of 3.4 m/s. A speedboat leaves the marina 12 s later with an initial speed of 2.8 m/s and an acceleration of 1.7 m/s2. Let the time the speedboat leaves the marina be t = 0 and let the direction of travel of both boats be the positive x direction.
Write position-time equations for fishing boat.
Express your answer in terms of t .
When does the speedboat catch up with the fishing boat?
Answers
(a) The position-time equations for fishing boat is x = 3.4t + 40.8
(b) The time taken for the speedboat to catch up with the fishing boat is 7.1 seconds.
Position-time equations for fishing boat
The position-time equations for fishing boat will be obtained by applying the principle of relative velocity as follows;
Let the time when the speedboat catches up = t
let the total time spent by fishing boat = t + 12
Distance traveled by the fishingx = 3.4(t + 12)
x = 3.4t + 40.8
Distance between between the fishing boat and speed boatfishing boat is moving at a constant speed = 3.4 m/s
speed boat started moving 12 seconds later,
distance between the boats = 3.4 m/s x 12 s = 40.8 m
final velocity of the speedboatv = u + at
v = 2.8 + 1.7t
set up the following equation to determine the time when the two boats meet.
vt - x = 40.8
t(2.8 + 1.7t) - (3.4t + 40.8) = 40.8
2.8t + 1.7t² - 3.4t - 40.8 = 40.8
1.7t² - 0.6t - 81.6 = 0
solve the quadratic equation using formula method as shown below;
a = 1.7, b = -0.6, c = -81.6
t = 7.1 seconds
Thus, the time taken for the speedboat to catch up with the fishing boat is 7.1 seconds.
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NEED HELP ON QUESTION ASAP! !
If answer is correct I'll rate you five stars a thanks and maybe even brainliest!
Please can you explain what this paragraph is trying to say. Also what does it mean in the sentence 'the difference in charge across the battery provides push for current' and what is the difference in charge.
Here's paragraph I need to have a simple definition of:
A high waterfall is also like a large voltage. It will transfer a lot of energy to the water (charge), making the river flow very fast (a large current) the difference in height makes the river flow. In a circuit , the difference in charge across battery provides push for the current.
Answers
It is saying that a high waterfall has a lot of potential energy that can transfer to the water and cause it to flow very fast, which is similar to how a large voltage in an electric circuit can create a large current. The difference in height of the waterfall causes the water to flow, just as the difference in charge across a battery provides the push or force for the current to flow in a circuit.
In an electric circuit, voltage is the measure of the electric potential difference between two points, and it is measured in volts. Current is the flow of electric charge through the circuit, and it is measured in amperes or amps. The difference in charge across the battery refers to the potential difference or voltage between the positive and negative terminals of the battery, which creates an electric field and provides the force or push for the current to flow through the circuit.
explain why the ray does not bend when it enters the semi circular glass block
Answers
The ray does not bend when it enters the semi circular glass block - Light ray incident on semicircular block at 90 degrees, therefore there is no change in the direction of ray at P.
Electromagnetic radiation that falls within the region of the electromagnetic spectrum that the human eye can see is known as light or visible light.
Light is electromagnetic radiation that the human eye can perceive. From radio waves with wavelengths measured in meters to gamma rays with wavelengths shorter than around 1 1011 meters, electromagnetic radiation occurs throughout an incredibly broad range of wavelengths.
Light governs our sleep-wake cycle and is crucial to our health and wellbeing. In actuality, "light" that is visible is a type of radiation, which is just energy that moves in the form of electromagnetic waves. It can alternatively be explained as a flow of "wave-packets," or particles, known as photons.
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correctness the relation Where pressure=3accleration due to gravity/4pi G
Answers
Explanation:
given expression, \rho=\frac{3g}{4rG}ρ=
4rG
3g
where \rhoρ is density , g is acceleration due to gravity , r is radius and G is universal gravitational constant.
dimension of \rhoρ = [ML^-3]
dimension of g = [LT^-2]
dimension of r = [L]
dimension of G = [M^-1L^3T^-2]
expression will be dimensionally correct,
dimension of \rhoρ = dimension of {g/rG}
LHS = dimension of \rhoρ = [ML^-3]
RHS = dimension of {g/rG} = dimension of g/dimension of r × dimension of G
= [LT^-2]/[L][M^-1L^3T^-2]
= [ML^-3]
here, LHS = RHS
so, expression is dimensionally correct.
On the moon, what would be the force of gravity acting on an object that has a mass of 7kg?
Answers
Answer:
Force of gravity, F = 70 N
Explanation:
It is required to find the force of gravity acting on an object that has a mass of 7 kg. Force of gravity always acts in downward direction.
The force of gravity is equal to the weight of an object. It is given by :
\(F=mg\)
g = acceleration due to gravity, for Earth, g = 10 m/s²
So,
\(F=7\times 10\\\\F=70\ N\)
So, 70 N of force of acting on an object.
The gravitational force between two bodies varies inversely as the square of the distance between them. If the force between two bodies is 18 N when the distance between them is 10 km, find the fource between the bodies when the distance between them is 7.5 km.
Answers
The statement states that the force between both the bodies at a distance of 7.5 km equals F = 32 N.
What is gravitational force?This force that earth applies to a body is referred to as gravitational force. Its down motion of water in the river, the downwards motion if water in a stream, or an upwards motion of a ball being thrown are examples of motion brought on by gravitational influence.
Briefing:F = k/d² where k is the inverse variation's constant.
18 N = k / (10 km)²
18 N = k / 100 km²
k = (18 N) (100 km²)
k = 1800 (N)(km²)
F = ?
d = 7.5 km
k = 1800 (N) (km²)
F = 1800 (N)(km²) / (7.5 km)²
F = 1800 (N) (km²) / (55.25 km²)
F = 32 N
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How fast must the space shuttle go to cover 20,000 meters in 4.0 seconds?
Answers
Answer:
5000 m/s
Explanation:
calculate the upthrust aciting on a body if its
true weight is 550 N and apparent weight
lis 490 N
Answers
Answer:
As a body moving upward
T=real weight + apparent weight
T=550+490
T=1040
hope u will get the answer:)
Explanation:
in a hockey game, player A passes the puck to player B, who is standing on the blue line, as shown in the diagram. The puck travels distance d1=24.1m on its way to player B, making an angle = 52.5 degrees with the x axis. Player B then passes the puck so that it moves d2=7.9m on the blue line in the negative x direction. A) What is the magnitude of the total displacement in meters? B) What angle, in degrees, does the total displacement make with the x axis?
Answers
The magnitude of the total displacement is 20.28 m.
The angle of the total displacement with the x axis is 70.5⁰.
Total displacement
The total displacement of the player is calculated as follows.
Apply cosine rule as shown below;
d² = d₁² + d₂² - 2d₁d₂ cos(θ)
d² = (24.1)² + (7.9²) - (2 x 24.1 x 7.9) cos(52.5)
d² = 411.42
d = √411.42
d = 20.28 m
Angle of the displacement with horizontalApply sine rule as shown below;
d/sinD = d₂/sinD₂
20.28/sin(52.5) = 7.9/sinD₂
25.562 = 7.9/sinD₂
sinD₂ = 7.9/25.562
sinD₂ = 0.309
D₂ = sin⁻¹(0.309)
D₂ = 18⁰
angle with x axis = 18⁰ + θ
= 18⁰ + 52.5⁰
= 70.5⁰
Thus, the magnitude of the total displacement is 20.28 m.
The angle of the total displacement with the x axis is 70.5⁰.
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What is urea? plz help me
Answers
Answer:
It is a colorless crystalline compound which is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine.
Answer:
Urea is a compound of nitrogen that is the chief solid substance dissolved in the urine of a mammal and is formed by the breaking down of protein.
(Hope this helps! Btw, I answered first. Brainliest please! :D)
A ball has a mass of 140 g what is the force needed to accelerate the mall at 25 m/s squared
Answers
Change 140g to kg
Answer:
\(\boxed {\boxed {\sf 3.5 \ Newtons}}\)
Explanation:
Force is the product of mass (in kilograms) and acceleration (in meters per square second).
\(F=ma\)
The mass of the ball is 140 grams and the acceleration is 25 m/s². Convert grams to kilograms.
1 kg=1000 g\(140 \ g *\frac{1 \ kg}{1000 \ g}=\frac{140}{1000} \ kg =0.14 \ kg\)Substitute the values into the formula.
\(F= 0.14 \ kg * 25 \ m/s^2\)
Multiply.
\(F= 3.5 \ kg*m/s^2\)
1 kilogram meter per square second is equal to 1 NewtonOur answer equals 3.5 Newtons\(F= 3.5 \ N\)
3.5 Newtons of force are required.
Mona said, "I think that, when there is no lid, convection is the main way that
energy escapes from the water."
Has she drawn a good conclusion from her results? Explain your ideas
Answers
Mona's conclusion that convection is the main way that energy escapes from the water when there is no lid may or may not be a good conclusion, depending on the context and information provided.
Convection is a process of heat transfer that involves the movement of fluids (in this case, the water) due to differences in temperature. It occurs when warmer portions of the fluid rise and cooler portions sink, creating a circulating flow.
To determine if Mona's conclusion is valid, additional information is needed. Factors such as the presence of other heat transfer mechanisms (such as radiation or evaporation), the specific setup of the experiment, and the conditions under which the observations were made are essential.
If Mona's experiment only considered convection as the primary mechanism for energy escape and excluded other factors, her conclusion might be incomplete or inaccurate. To draw a more comprehensive conclusion, it is necessary to consider other potential heat transfer mechanisms and perform further investigations or provide additional supporting data.
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who is bill cypher and what is his origin?
Answers
Answer:
Bill Cipher is the true main antagonist of Gravity Falls. He is a Dream-Demon with mysterious motives and seems to have a vendetta against the Pines family, especially his old rival Stanford Pines
Explanation:
An unmarked police car traveling a constant 85 km/h is passed by a speeder. Precisely 2.00 s after the speeder passes, the police officer steps on the acceleratorIf the police car accelerates uniformly at 2.00 m/s2 and overtakes the speeder after accelerating for 9.00 s , what was the speeder's speed?.
Answers
Answer:
observe o gráfico abaixo que mostra o número de internação em um hospital no município no período de 1960
How do most black holes form?
Answers
Create an Energy Concept Map that has all the key terms from the Energy unit. The words should connect with lines, and explanation of why the connection is there should be written on the line.
Answers
Energy conservation is the principle that energy is neither created nor destroyed, but can only be converted or transferred. It involves using energy-efficient appliances and transitioning to renewable energy sources to reduce consumption and environmental impact.
Energy conservation refers to the principle that energy cannot be created or destroyed; it can only be converted from one form to another or transferred between systems. This principle is based on the law of conservation of energy, also known as the first law of thermodynamics. In other words, the total amount of energy in a closed system remains constant over time.
One example of energy conservation is the use of energy-efficient appliances in households. By using appliances that are designed to minimize energy waste, such as energy-saving light bulbs, efficient refrigerators, or insulated windows, individuals can reduce their energy consumption and lower their electricity bills. These appliances are designed to convert electrical energy into useful forms, such as light or heat, with minimal energy losses.
Additionally, energy conservation plays a crucial role in sustainable practices and environmental preservation. For instance, reducing reliance on non-renewable energy sources like fossil fuels and transitioning to renewable energy sources such as solar or wind power helps conserve natural resources and reduces greenhouse gas emissions.
In summary, energy conservation is the principle that states energy cannot be created or destroyed but can only be converted or transferred between different forms. By adopting energy-efficient practices and utilizing renewable energy sources, individuals and society can contribute to conserving energy and mitigating environmental impact.
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The question probable may be:
Explain the concept of energy conservation and provide an example of how it applies in real-life situations.
True or false Uhs does not do business with, hire, or bill for service rendered persons- those excluded or debarred individuals or entitles
Answers
False. UHS does not do business with, hire, or bill for service rendered to excluded or debarred individuals or entities.
What is entities?Entities are objects, people, places, events, or concepts that are represented within a system or database. They can be physical or abstract, and can be represented in a variety of different ways. For example, a customer in a database might be an entity, and its attributes such as name, address, and telephone number may be represented as individual entities. In a computer system, entities are used to represent data and act as a way to organize information. Entities are often linked with relationships, which are connections between different entities. This allows for data to be organized and accessed in a structured way. Entities can also be used to represent complex systems, allowing for easier manipulation and understanding. Entities are an important part of any database or system and play a major role in data management.
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As part of a movie stunt, a full-size remote-controlled car is driven horizontally off a 9.00 m tall cliff at 24.40 m/s. How far (Δx) from the bottom of the cliff does the car land?
Answers
Explanation:
Find the time it takes to hit the bottom....then multiply this time by the horizontal velocity .......
Time to hit bottom :
d = 1/2 at^2
9 m = 1/2 (9.81 m/s^2) (t^2) shows t = 1.35 s
Now the horizontal displacement is
x = rate * time = 24.40 m/s * 1.35 s = 33.1 m
Which of the following modulation techniques vary the amplitude of the carrier wave in proportion to the amplitude of the analog information carrying signal?
Answers
Frequency modulation (FM) techniques vary the amplitude of the carrier wave in proportion to the amplitude of the analog information carrying signal.
In frequency modulation, the frequency rather than the amplitude of the carrier wave is made to vary in proportion to the varying amplitude of the modulating signal.
Frequency modulation is a straightforward approach for simple biomimetic encoding, as it is strongly related to how information is represented in the spiking rate. Experimental results using pulse frequency modulation to encode applied force.
For FM microwave systems, the FM terminal equipment consists of an FM transmitter and an FM receiver.
The FM transmitter contains an oscillator circuit that is capable of having the rest frequency deviated above and below this value by the baseband signal.
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Which of the following modulation techniques vary the amplitude of the carrier wave in proportion to the amplitude of the analog information carrying signal?
(a) Amplitude modulation
(b) Frequency modulation
(c) Phase modulation
(d) Phase-Shift modulation
A roller coaster is at a peak of 20m and has a mass of 900kg. What is the potential energy of the roller coaster?
O 100000 J
10000 J
O 9.8 J
O 176400 J
Answers
The potential energy of the roller coaster is 176,400 J (joules).
The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.
In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).
Using the formula, we can calculate the potential energy:
PE = mgh
= (900 kg)(9.8 \(m/s^2\))(20 m)
= 176,400 J
Therefore, the potential energy of the roller coaster is 176,400 J (joules).
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In 1940, it was discovered that uranium could be artificially changed to plutonium, a process called transmutation. What combination of decay processes would convert U-239 (92 protons) into Pu-239 (94 protons)?
A. Beta-decay followed by beta decay.
B. Positron emission followed by electron capture.
C. Electron capture followed by alpha decay.
D. Alpha decay followed by beta decay.
Answers
The combination of decay processes that would convert U-239 into PU- 239 is beta decay followed by another beta decay. There are two different types of beta decay (positive and negative beta decays) they both occur simultaneously in order to move the atoms towards stability.
Before a collision, a 25 kg object is moving at 12 m/s to the right. After a collision with stationary box, the 25 kg object moves at 8 m/s to the right. What is the resulting momentum of the box?
Answers
The initial momentum of the 25 kg object is 25 kg * 12 m/s = 300 kgm/s. After the collision, the momentum of the 25 kg object is 25 kg * 8 m/s = 200 kgm/s. According to the conservation of momentum, the momentum lost by the 25 kg object is equal to the momentum gained by the box. Therefore, the resulting momentum of the box is 300 kgm/s - 200 kgm/s = 100 kg*m/s.
100! BRAINLY!!!!!!!!
You’ve just watched The Adaptable Mind. One of the most important future skills is curiosity. The dictionary defines curiosity as
the desire to learn or know about anything; inquisitiveness.
What is a topic that makes you curious? What about it do you find intriguing? Do you think it will eventually be part of your job?
HERE THE VIDEO on YT
"The Adaptable Mind"
by Tiffany Shlain & Let It Ripple Studio
( I just need your answer since I don't want to give my own, decide anything you like its for school though )
Answers
Explanation:
here. is your answer
2x-3y+4=0
1xy+4=0
5xy=0
xy=0/5
xy=5*0
0.answer.
2.4x-6y+9=0
2xy+9=0
11xy=0
xy=0/11
xy=11*0
xy=0.answer.
suppose a car of 1200kg is moving with a velocity of 40km/hr therefore its kinetic energy is not zero. 1. explain briefly what happens to its kinetic energy when the driver applies the breaks and the car stops
Answers
Answer:
Explanation:
For starters begin with a warning not to touch the brake drums. All of the KE is transferred to the brake drums. The result is a large rise in temperature. Heat. If you press hard on the brakes, rubber is left on the road and there is heat involved in that too.
Answer:
KInetic energy reduces.
Explanation:
Application of breaks reduces velocity. Reduction of velocity constitutes velocity reduction.
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Which correctly describes latent heat?
A. The heat of molecules that are under pressure
B. The heat held inside of ice crystals colder than -2°C
C. The heat absorbed or lost by a substance while it's changing state
D. The heat used to change the temperature of a liquid
Answers
Option C. The heat absorbed or lost by a substance while it's changing state correctly describes latent heat
Latent heat is the heat absorbed or lost by a substance while it is changing state.
The latent heat is a type of heat that is transferred during phase change, i.e., while a substance undergoes a change of state.
For example, when ice melts into liquid water, or when liquid water evaporates into water vapor, heat is absorbed from the surroundings.
Latent heat is not associated with a temperature change; rather, it's associated with a change of state.
For instance, the temperature of water remains at 100°C while boiling.
When water is boiling, the latent heat of vaporization is absorbed and utilized to break the hydrogen bonds holding water molecules together to change water from the liquid phase to the gaseous phase.
When the water is boiling, adding more heat won't increase the water's temperature, instead, the extra heat will be absorbed to change the phase of water molecules.
Therefore, the correct answer to the given question is option C: The heat absorbed or lost by a substance while it is changing state.
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A thin piece of semiconducting silicon will be used to fabricate an electrical device. This layer is 0.10 cm thick and cut into a strip 0.50 cm wide by 1.50 cm long. Electrical contacts are placed at opposite ends of its length. The intrinsic carrier concentration of the silicon at room temperature (300K) is 1.0x1010/cm3 and the bandgap energy is 1.12 eV.
Required:
a. If the application of 1.0 volt to the contacts results in a current of 0.019 amps, what is the resistivity in (ohm-cm) of the material?
b. If the material's conductivity is due to doping with aluminum to a level of [Al]= 1x10^17 atoms/cm^3, what is the resulting conductivity "type" and what is the mobility of these "majority" carriers in this material (assuming that the aluminum is fully ionized - i.e. all Al atoms donated electrons).
Answers
We have that for the Question "a)what is the resistivity in (ohm-cm) of the material? b) what is the resulting conductivity "type" and what is the mobility of these "majority" carriers in this material"
Answer:
Resistivity = \(1.754 ohm-cm\)Conductivity = \(6.25*10^{25} cm^3/V-s\)
From the question we are told
This layer is 0.10 cm thick and cut into a strip 0.50 cm wide by 1.50 cm long. The intrinsic carrier concentration of the silicon at room temperature (300K) is 1.0x1010/cm3 and the bandgap energy is 1.12 eV.
A) Resistivity is given as,
\(p = \frac{RA}{l}\)
where,
\(R = \frac{V}{I}\)
Therefore,
\(p = \frac{VA}{Il}\\\\p = \frac{1*(0.1*0.5)}{0.019*1.5}\\\\p = 1.754 ohm-cm\)
B) Conductivity is given as,
\(U = \frac{\rho}{pe}\\\\U = \frac{10^{17}}{10^{10}*1.6*10^{-19}}\\\\U = 6.25*10^{25} cm^3/V-s\)
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Common Misconceptions about the Consumer Price Index [CPI]: Questions and
Answers
When the cost of food rises, does the CPI assume that consumers switch to less
desired foods, such as substituting hamburger for steak?
No. In January 1999, the BLS [Bureau of Labor Statistics] began using a geometric
mean formula in the CPI that reflects the fact that consumers shift their purchases
toward products that have fallen in relative price.... The CPI's objective is to calculate
the change in the amount consumers need to spend to maintain a constant level of
satisfaction.... The BLS is not assuming that consumers substitute hamburgers for
steak... Furthermore, the CPI doesn't implicitly assume that consumers always
substitute toward the less desirable good. Within the beef steaks item category, for
example, the assumption is that consumers on average would move up from flank
steak to filet mignon if the price of flank steak rose by a greater amount (or fell by less)
than filet mignon prices.
"Consumer Price Index," U.S. Bureau of Labor Statistics
Based on the text, how does the Consumer Price Index vary over the course of a
business cycle? E.2.1
O It changes according to the number of goods produced by a business.
O It changes according to availability of items, depending upon which items are priced the highest.
O It changes according to the desires of the consumers and access to lower-priced goods.
() It changes according to availability of ponds in the market hased on consumer needs
Answers
Consumer Price Index vary over the course of a business cycle It changes according to the desires of the consumers and access to lower-priced goods.
Based on the provided text, the Consumer Price Index (CPI) changes according to the desires of the consumers and access to lower-priced goods. The text mentions that consumers shift their purchases toward products that have fallen in relative price. The objective of the CPI is to calculate the change in the amount consumers need to spend to maintain a constant level of satisfaction.
The passage specifically states that the CPI does not assume that consumers substitute less desirable goods for more expensive ones. Instead, it acknowledges that consumers may move up within a category if the price of a lower-priced item rises more than that of a higher-priced item.
For example, within the beef steaks category, consumers are assumed to move up from flank steak to filet mignon if the price of flank steak rises by a greater amount or falls by less than filet mignon prices.
Therefore, the CPI takes into account consumer preferences and the availability of lower-priced goods. It reflects changes in prices and consumer behavior over the course of a business cycle, considering how consumers adjust their purchasing decisions based on price fluctuations and their desire for maintaining a constant level of satisfaction.
In summary, the CPI varies over the course of a business cycle based on consumer desires and access to lower-priced goods, rather than the availability of goods produced by businesses or the availability of specific items priced the highest.
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