Answer:
b
Explanation:
A confined aquifer underlain by an aquiclude and overlain by an aquitard and a water-table aquifer. The following characteristics are given: Confined aquifer: b=5.2 m, K=0.73 m/ day, S=0.0035, T=3.8 m 2/d Aquitard: b ′ =1.1 m, K′ =5.5×10 −5 m/ day, S ′ =0.00061 Water-table aquifer: b ′′=25 m, K ′′ =35 m/ day A well that fully penetrates the aquifer is pumped at a rate of 28 m 3 / day, what is the drawdown after 1 day of pumping at the following distances from the well: 1.5,5.5,10,25,75,150 m ? Be sure the assumptions can be met using the criteria discussed in Chapter 5.4.2.2. Ignore the assumption concerning the well diameter.
the drawdown at each distance from the well after 1 day of pumping.
calculate the drawdown at different distances from the well, we can use the Theis for equation confined aquifers:
s = (Q / (4πT)) × W(u)
where:
s is the drawdown at a certain distance from the well,
Q is the pumping rate (28 m³/day),
T is the transmissivity of the confined aquifer (3.8 m²/day),
W(u) is the well function that depends on the dimensionless distance u.
The well function W(u) can be calculated
W(u) =\((1 / u) × e^(u^2) × erfc(u)\)
where:
u = (r²S) / (4Tt)
r is the distance from the well,
S is the\(storativity\) of the confined aquifer (0.0035),
t is the time of pumping in days,
(u) is the complementary error function.
Now let's calculate the drawdown at the given distances of 1.5 m, 5.5 m, 10 m, 25 m, 75 m, and 150 m after 1 day of pumping.
Assuming the well is located at the origin (0,0) in a radial system:
For r = 1.5 m:
u = (1.5² × 0.0035) / (4 × 3.8 × 1)
Calculate W(u) and substitute the values into the Theis equation to find s.
For r = 5.5 m:
u = (5.5² × 0.0035) / (4 × 3.8 × 1)
Calculate W(u) and substitute the values into the Theis equation to find s.
For r = 10 m:
u = (10² × 0.0035) / (4 × 3.8 × 1)
Calculate W(u) and substitute the values into the Theis equation to find s.
For r = 25 m:
u = (25² × 0.0035) / (4 × 3.8 × 1)
Calculate W(u) and substitute the values into the Theis equation to find s.
For r = 75 m:
u = (75² × 0.0035) / (4 × 3.8 × 1)
Calculate W(u) and substitute the values into the Theis equation to find s.
For r = 150 m:
u = (150² × 0.0035) / (4 × 3.8 × 1)
Calculate W(u) and substitute the values into the Theis equation to find s.
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.
if 2.5 minutes is the maximum access time for a magnetic tape, ____ is the average access time.
If 2.5 minutes is the maximum access time for a magnetic tape, 1.25 minutes is the average access time.
What is access time for a magnetic tape?
how long it takes to get a piece of information out of storage is access time. If the file holding the necessary data is on magnetic tape instead of a magnetic disc, the access time may be measured in minutes rather than in milliseconds.
The average access time is the sum of the average seek time, the command overhead, and the average latency.
Given that: the maximum access time for a magnetic tape = 2.5 minutes.
Hence, the the average access time = 2.5 minutes/2 = 1.25 minutes.
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Which statement is a description of Charles’s law?
The temperature and volume of a gas are directly proportional when pressure is constant.
The temperature and volume of a gas are inversely proportional when pressure is constant.
The volume and pressure of a gas are directly proportional when temperature is constant.
The volume and pressure of a gas are inversely proportional when temperature is constant.
Answer:
The temperature and volume of a gas are directly proportional when pressure is constant
A small car with mass of 0.800 kg travels at a constant speed
on the inside of a track that is a vertical circle with radius 5.00
m. If the normal force exerted by the track on the car when it
is at the bottom of the track is 25 N,
a) What is the normal force on the car when it is at the (i)
top, (ii) rightmost and (iii) leftmost point of the track?
b) What is the speed of the car as it travels around the
vertical circle?
Answer:
The equation of equilibrium at the top of the vertical circle is:
\Sigma F = - N - m\cdot g = - m \cdot \frac{v^{2}}{R}
The speed experimented by the car is:
\frac{N}{m}+g=\frac{v^{2}}{R}
v = \sqrt{R\cdot (\frac{N}{m}+g) }
v = \sqrt{(5\,m)\cdot (\frac{6\,N}{0.8\,kg} +9.807\,\frac{kg}{m^{2}} )}
v\approx 9.302\,\frac{m}{s}
The equation of equilibrium at the bottom of the vertical circle is:
\Sigma F = N - m\cdot g = m \cdot \frac{v^{2}}{R}
The normal force on the car when it is at the bottom of the track is:
N=m\cdot (\frac{v^{2}}{R}+g )
N = (0.8\,kg)\cdot \left(\frac{(9.302\,\frac{m}{s} )^{2}}{5\,m}+ 9.807\,\frac{m}{s^{2}} \right)
N=21.690\,N
To understand the origin of the torque on a current loop due to the magnetic forces on the current-carrying wires.
This problem will show you how to calculate the torque on a magnetic dipole in a uniform magnetic field. We start with a rectangular current loop, the shape of which allows us to calculate the Lorentz forces explicitly. Then we generalize our result. Even if you already know the general formula to solve this problem, you might find it instructive to discover where it comes from.
a) Give a more general expression for the magnitude of the torque τ. Rewrite the answer found in Part A in terms of the magnitude of the magnetic dipole moment of the current loop m. Define the angle between the vector perpendicular to the plane of the coil and the magnetic field to be ϕ, noting that this angle is the complement of angle θ in Part A.
Give your answer in terms of the magnetic moment m, magnetic field B, and ϕ.
Answer:
The torque is \(\tau = B * m sin(\phi )\)
Explanation:
Generally when current flow through a rectangular loop the magnetic dipole generated we can denote this as \(\vec m\)
Here k is the length of the side of one side of the rectangular loop
Now when this loop is place in a magnetic field, the torque it experience is mathematically represented as
\(\vec \tau = \vec B \ X \ \vec m\)
Here X stands for cross - product
From the question we are told that the angle between the vector ( \(\vec m\))perpendicular to the plane of the coil and magnetic field(B) as \(\phi\)
So
=> \(\tau = B * m sin(\phi )\)
Help me to answer this pls
here is the answers, hope this helps you.
a crane lifts a piano that weighs 3,240 n in the air 10m in 60 seconds. how much power does the crane have?
The crane has a power of 540 watts when it lifts the 3,240 N piano 10 meters in 60 seconds.
To calculate the power of the crane, we need to use the formula:
Power = Work / Time
The work done by the crane is equal to the force it applies multiplied by the distance it lifts the piano, which is:
Work = Force x Distance
Work = 3,240 N x 10 m
Work = 32,400 Joules
The time it takes for the crane to lift the piano is given as 60 seconds.
Now we can substitute these values into the formula for power:
Power = Work / Time
Power = 32,400 J / 60 s
Power = 540 watts
The 3,240 N piano is lifted 10 metres in 60 seconds by the crane, which has a power of 540 watts.
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PLEASSSE HURRY!!
The sum of all of the chemical reactions occurring in a cell is called
A) photosynthesis
B) diffusion
C) oxidative respiration
D) metabolism
Answer:
d
Explanation:
i am smart
Which of these would be considered a drawback of hydroelectric power in an area that previously did not have access to this energy source?A) I only) II only) IF only) I & II only
Draw a logic circuit for (A+B)C 2) Draw a logic circuit for A+BC+D ′
3) Draw a logic circuit for AB+(AC) ′
The Boolean expressions (A + B) C, A + BC + D', and AB + (AC)' have been expanded using the Boolean algebra rules and their corresponding logic circuits have been designed.
The Boolean expression (A + B) C can be expanded as follows;
(A + B) C = AC + BC b. The logic circuit of (A + B) C is shown below;
The Boolean expression A + BC + D' can be expanded as follows;A + BC + D' = A + BC + (B + C)'D = A(B + C)' + BC(B + C)' + (B + C)' D'
The logic circuit of A + BC + D'.
The Boolean expression AB + (AC)' can be expanded as follows;AB + (AC)' = AB + A'B'b. The logic circuit of AB + (AC)' is shown below.
There are different types of logic gates such as AND, OR, NOT, NAND, and NOR gates, which can be used to implement the Boolean functions.
The Boolean expressions (A + B) C, A + BC + D', and AB + (AC)' have been expanded using the Boolean algebra rules and their corresponding logic circuits have been designed.
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A piece of glass weighed 52 N in air, 32N in water and 18N in Sulphuric acid. What is the (density of water 1.0g/cm²³)
The required density of the glass is given as 2.6 × 10³ kg/m³.
What is volume?Volume is defined as the mass of the object per unit density while for geometry it is calculated as profile area multiplied by the length at which that profile is extruded.
Here,
Weight of glass in air = 52N
mg = 52N
m = 5.2 Kg
Now,
The difference in weight of glass in air and water,
Upthrust = Volume × density of water × g = 52-32
Volume × 1000 × 10 = 20
Volume = 2 × 10⁻³ m³
The density of glass = mass of glass/volume of glass
= 5.2/2 × 10⁻³
= 2.6 × 10³ kg/m³
Thus, the required density of the glass is given as 2.6 × 10³ kg/m³.
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Which of the following electrical devices does NOT contain an electric motor?
A drill
B mixer
C toaster
D sander
Which of the following is an example of the Doppler effect? A water bug on the surface of a pond is producing small ripples in the water. The bug is not moving. A police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase. Scientists measure the speed of light and find that it is constant. The gravitational pull of two objects on each other
Answer:
A police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase.
Explanation:
In Physics, Doppler effect can be defined as the change in frequency of a wave with respect to an observer in motion and moving relative to the source of the wave.
Simply stated, Doppler effect is the change in wave frequency as a result of the relative motion existing between a wave source and its observer.
The term "Doppler effect" was named after an Austrian mathematician and physicist known as Christian Johann Doppler while studying the starlight in relation to the movement of stars.
The phenomenon of Doppler effects is generally applicable to both sound and light.
An example of the Doppler effect is a police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase. This is so because when a sound object moves towards you, its sound waves frequency increases, thereby causing a higher pitch. However, if the sound object is moving away from the observer, it's sound waves frequency decreases and thus resulting in a lower pitch.
Other fields were the Doppler effects are applied are; astronomy, flow management, vibration measurement, radars, satellite communications etc.
Answer:
A police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase.
Explanation:
This should be the correct answer.
I need the right answer ASAP NO LINKS!!!
The first one!
Hope this helps pls mark as brainliest :)
Answer:
Models change to accommodate new discoveries.
Explanation:
Scientific models are based on current scientific knowledge. This means that when new discoveries are made they are subject to change.
how to calculate how deep an object sinks in water
a block of mass m is released from rest and slides down an incline, as shown in the figure. the length d of the incline is 0.8 m and the angle of the incline, θ, is 37°. a graph of the speed v as a function of time t of the block as it descends the incline is shown. how could a student use the graph and the information provided to determine whether the block-earth system is an open system or a closed system?
The system is open, because there is a net force exerted on the block.
What are some instances of kinetic energy?An individual strolling, a taking off baseball, a piece tumbling from a table and a charged molecule in an electric field are instances of dynamic energy at work. An item that isn't moving has zero motor energy.
The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force. After the job is finished, energy is transferred to the item, which then moves at a new, constant speed.
According to question:
On graphing free body diagram of the problem
There is a force = mgsin(37°)
So, the it is a open system.
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chapter 1que 32The density of lead is 11.4 g/cm3 at 25°C. Calculate the volume occupied by 25.0 g oflead.A) 2.19 cm3 B) 0.456 cm3 C) 285 cm3 D) 1.24 cm3 E) 6.05 cm3
The density of lead is 11.4 g/cm3 at 25°C and the volume occupied by 25.0 g of lead is 2.19 cm3. Hence, option A is the correct option.
The formula to calculate the volume (V) of a substance is:
V = m / ρ
Here, m is the mass of the substance and ρ is its density so in this case, we have:
m = 25.0 g
ρ = 11.4 g/cm3
Putting these values into the formula:
V = 25.0 g / 11.4 g/cm3
V = 2.19 cm3
Therefore, the volume occupied by 25.0 g of lead is 2.19 cm3.
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Define propagation of sound
Considering the definition of speed and propagation of sound, sound is a sequence of waves of pressure which propagates through compressible media and depends on the characteristics of the medium in which the propagation occurs.
Definition of speed and propagation of soundSound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
That is, sound is a longitudinal wave, mechanical (does not travel in a vacuum) and propagates in all directions, so that the wave front is spherical.
Propagation of sound involves energy transport without matter transport, in the form of mechanical waves.
The speed of propagation of a sound wave depends on the characteristics of the medium in which the propagation occurs and not on the characteristics of the wave or the force that generates it. The speed of propagation of sound waves is also known as the speed of sound.
SummaryIn summary, sound is a sequence of waves of pressure which propagates through compressible media and depends on the characteristics of the medium in which the propagation occurs.
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8-30-2018 what phase change occurs as the substance at 0 degree c has its pressure dropped from 0.50 at to 0.25 atm
Answer:
at T = 0ºC the change of state is from the solid state to the gaseous state
Explanation:
In this exercise we are asked about the changes of state, from the data we will assume that the material is water.
Water can exist in three solid states, liquid and gas, in a graph of pressure ℗ against temperature (T) there is a point called triple at T = 0.01ºC, below this point the curve has two states at high pressure solid and low pressure gas.
As a result of the previous ones at T = 0ºC the change of state is from the solid state to the gaseous state
calculate the temperature at which the reading on Fahrenheit scale is equal to half the reading of Celsius scale
Answer:
Therefore, the temperature at which the Fahrenheit scale reading is equal to half of the Celsius scale is −24.6∘C .
The breaking car had 10,000 J of kinetic energy before breaking after breaking it had 2000 J of kinetic energy. How much thermal energy did the brakes gain?
Answer:
8000J
Explanation:
The kinetic energy of the car lost during breaking are converted to thermal energy and are gained by the brakes.
Kinetic energy loss by car = thermal energy gained by brakes.
∆K.E = ∆T.E ....1
The Kinetic energy loss by car can be expressed as;
∆K.E = K.E1 - K.E2
Initial K.E = K.E1 = 10000J
Final K.E = K.E2 = 2000J
∆K.E= 10000J - 2000J = 8000J
From equation 1,
∆K.E = ∆T.E
∆T.E = 8,000J
thermal energy gain by brakes = 8,000J
Which solution has the greatest number of hydrogen ions?
blood, pH = 7.2
lemon juice, pH = 2
soda, pH = 3.5
bleach, pH = 13.5
Answer:
lemon
Explanation:
the lower the number the hier hydrogen ions
Answer: B
Explanation:
The table shows data for the planet Uranus. A 2 column table with 4 rows. The first column is labeled Quantity with entries, Escape velocity in kilometers per second, Gravitational acceleration in meters per second squared, Orbital velocity in kilometers per second, Length of day in hours. The second column is labeled Value with entries, 21.3, 8.7, 6.8, 17.2. To the nearest whole number, how much would a 25.0 kg rock weigh on Uranus?To the nearest whole number, how much would a 25.0 kg rock weigh on Uranus?
Answer:
218 N
Explanation:
edge2020
The table shows data for the planet Uranus, the weight of a 25.0 kg rock on Uranus would be approximately 218 N.
In physics, weight refers to the force imposed on an item owing to gravity. It is the gravitational force exerted on the mass of an item.
The gravitational acceleration value supplied in the table may be used to calculate the weight of a 25.0 kilogramme rock on Uranus.
Uranus' gravitational acceleration is given at 8.7 metres per second squared.
The weight of an object is derived by multiplying its mass (m) by its gravitational acceleration (g):
Weight = mass * gravitational acceleration
Weight = 25.0 kg * 8.7 m/s^2
Weight = 217.5 N
The weight of a 25.0 kg rock on Uranus would be approximately 218 N.
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A round asteroid has a surface gravity of .0288 m/s^2 if the mass of the asteroid is 1.10 x10^18 kg what is its radius
Answer:
r = 50.47 x 10³ m = 50.47 km
Explanation:
Using the formula for the acceleration due to gravity:
\(g = \frac{Gm}{r^2}\)
where,
g = acceleration due to gravity on the surface of asteroid = 0.0288 m/s²
G = Universal Gravitational Constant = 6.67 x 10⁻¹¹ Nm²/kg²
m= mass of asteroid = 1.1 x 10¹⁸ kg
r = radius of asteroid = ?
Therefore,
\(0.0288\ m/s^2 = \frac{(6.67\ x\ 10^{-11}\ Nm^2/kg^2)(1.1\ x\ 10^{18}\ kg)}{r^2} \\\\r = \sqrt{\frac{(6.67\ x\ 10^{-11}\ Nm^2/kg^2)(1.1\ x\ 10^{18}\ kg)}{0.0288\ m/s^2}}\)
r = 50.47 x 10³ m = 50.47 km
Answer:
5.05x10^4
Explanation:
g=(GM)/r^2, so
.0288=(6.67x10^-11*1.10x10^18)/r^2, r=5.05x10^4.
This is correct on Acellus.
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A car accelerates from 15 km/hr to 60 km/hr in 30 seconds what is the acceleration?
Acceleration = (change in speed)/(time)
Change in speed = (60-15) = 45 km/hr
Time for the change = 30 sec
Acceleration = 1.5 km/hr-sec
Energy is the energy an object has because of its motion. True or False
That depends on what word you skipped at the beginning of the question.
If it's supposed to be "Potential" energy, then the statement is false.**
If It's supposed to be "Kinetic" energy, then the statement is true.
** It's also false if the missing word is "Chemical", "Mechanical", "Thermal", "Nuclear", "Electrical", "Electromagnetic", or "Nervous".)
what additional information is most important for them to add to the graph to best explain the work they've done?
Text is helpful for guiding the viewer and assisting with understanding. The graph's text provides extra details. In graphs, there are two different sorts of text: text that appears around the data regions.
In mathematics, a graph is a visual representation of any data that has been organized. The graph depicts the link between the various variables. The set of items that are somehow related to one another is represented by the graph in a graph theory.
A report can include numerous data regions. Data regions expand to hold the information from the report dataset to which they are associated. For instance, a matrix that shows annual sales for each product has a row group based on the names of the products and a column group based on the years.
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you have likely noticed that the temperature on the thermometer tends to fluctuate. is this fluctuation realistic? why or why not?
The degree of change in a thermometer's thermometric characteristic for a unit temperature change is known as sensitivity. When something fluctuates, it undergoes rapid, unpredictably changing change.
What does temperature variation mean?Thermal fluctuations are arbitrary departures from the average state of a system that take place in an gravity system, according to statistical mechanics. All thermal fluctuations grow in size and frequency as temperature rises and diminish as temperature falls closer to absolute zero.
What causes temperature changes?That must be "temperature fluctuation," I suppose. Low pressure and high pressure are two separate sorts of pressure, which is why that is the case. Low pressure systems frequently bring inclement weather, which may include wind, rain, snow, or hail. As also, in those.
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Read the question, and then use the drop-down menus to complete the paragraph.
What is Earth’s atmosphere made of?
The most abundant gas in Earth’s atmosphere is
, followed by
, which is needed to burn wood and fuel. The third-most abundant gas is
. The amount of
in the atmosphere is very small, making up just 0.033% of the atmosphere, but it is very important because plants use it to make simple sugars. Another important gas is water vapor, which condenses around
in the atmosphere to form clouds and then rain.
Answer:
The most abundant gas in Earth’s atmosphere is nitrogen, followed by oxygen, which is needed to burn wood and fuel. The third-most abundant gas is argon. The amount of carbon dioxide in the atmosphere is very small, making up just 0.33% of the atmosphere, but it is very important because plants use it to make simple sugars. Another important gas is water vapor, which condenses around small particles in the atmosphere to form clouds and then rain.
Explanation:
The atmospere of the earth is made up of different types of gases like Nitrogen, oxygen, Carbon di oxide etc.
What is atmosphere?Atmosphere is defined as the envelope of the gases covered the whole planet of earth and is responsible to save us from ultravoilet rays and entrape the radiation to maintain the ideal temperature on the surface of earth by green house effect.
The most abundant gas in Earth’s atmosphere is nitrogen, followed by oxygen, which is needed to burn wood and fuel. The third-most abundant gas is argon.
The amount of carbon dioxide in the atmosphere is very small, making up just 0.33% of the atmosphere, but it is very important because plants use it to make simple sugars.
Another important gas is water vapor, which condenses around small particles in the atmosphere to form clouds and then rain.
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The oldest rock layer in an undisturbed rock sequence occurs
A;at the bottom of the sequence
B; below the sedimentary rock layer
C;below the unconformity
D;at the top of the sequence
Answer:
below the sedimentary rock layer