The correct option is (b) 1.25
The CPI of the project is 1.25. Earned Value (EV) is divided by Actual Cost (AC) to determine CPI.
CPI is calculated as follows: EV / AC. In this case, 250 / 200 = 1.25.
The CPI measures the effectiveness of project resources in relation to the project budget. Earned Value is divided by Planned Value to calculate SPI. SPI evaluates how well resources are performing in relation to the project schedule.The cost performance index (CPI) is a gauge of how closely the realized value of the job actually accomplished matches the costs really incurred: CPI = EV / AC. The actual progress (earned value) in comparison to the expected progress is measured by the schedule performance index (SPI) = EV / PVThe departure from the project's expected cost is measured using the CPI. SPI is the variance from the project's projected completion date. The project is over budget if the CPI is less than 1. Project is running late if SPI is less than 1.Learn more about the CPI and SPI with the help of the given link:
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An airplane starts from rest and accelerates at 10.8 m/s2 . what is its speed at the end of a 400 m long runway?
The final speed of an airplane is v = 92.95 m/s
The rate of change of position of an object in any direction is known as speed i.e. in other word, Speed is measured as the ratio of distance to the time in which the distance was covered.
Solution-
Here given,
Acceleration a= 10.8 m/s2 .
Displacement (s)= 400m
Then to find final speed of airplane v=?
Therefore from equation of motion can be written as,
v²=u²+ 2as
where, u is initial speed, v is final speed ,a is acceleration and s is displacement of the airplane. Therefore by putting the value of a & s in above equation and (u =0) i.e. the initial speed of airplane is zero.
v²= 2×10.8 m/s²×400m
v²=8640m/s
v=92.95m/s
hence the final speed of airplane v =92.95m/s
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____ voltage controls are simply controls that do not employ the use of a control transformer to change the voltage to a lower value.
The appropriate word in the blank is → Line.
We have a statement regarding Voltage controls.
We have to fill in the blank with appropriate word.
Why is Voltage control needed ?Voltage control is necessary to prevent damage such as overheating of generators and motors, to reduce transmission losses.
According to the question, we have -
____ voltage controls are simply controls that do not employ the use of a control transformer to change the voltage to a lower value.
The appropriate word for the blank is → Line. Line voltage controls do not employ control transformer to decrease voltage. Line voltage controllers are designed to regulate the voltage of HVAC systems which require direct electrical power. These controllers are also known as inline thermostats and are typically connected to wires supplying 120 to 240 volts of power to heating or cooling device.
Hence, the appropriate word for the blank is → Line
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Use the concept of inertia to explain why Newton’s first law of motion is accepted as true
A vertical spring stretches 3.9 cm when a 10.-g object is hung from it. The object is replaced with a block of mass 25 g that oscillates up and down in simple harmonic motion. Calculate the period of motion.
a bag is dropped from a hovering helicopter. the bag has fallen for 1.6 s. what is the bag's velocity?
The bag's velocity when a bag is dropped from a hovering helicopter is 15.68m/s
Its initial velocity is zero. In a free-falling body, the value of the final velocity is obtained through the equation
Vf =u + gt
u = o ( because the bag is dropped, so it falls starting from rest)
Vf = gt
u is initial velocity
Vf is final velocity
t is time
where g is the acceleration due to gravity, 9.8 m/s².
using above values we get
Vf = (9.8 m/s²)(1.6s)
= 15.68m/s
The bag's velocity when a bag is dropped from a hovering helicopter is 15.68m/s
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The distance from the center of a lens to the point at which light rays converge on the film is known as the ______ of the lens.
The distance from the center of a lens to the point at which light rays converge on the film is known as the focal length of the lens.
In photography, focal length is the distance measured in millimeters (mm) between the optical center of the lens and the camera sensor, where the light information is recorded.
It is important because it dictates the distance your camera will be able to capture. Smaller numbers show more scene and have wider angle while larger numbers show less scene and have tighter angle of view.
What is photography?The process of recording an image on light-sensitive film is known as photography.
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Gold has a density of 0.01932 kg/cm3. what is the mass (in kg) of a 132.5 cm3 sample of gold?
Answer:
ρ = M / V ρ = density
M = ρ * V = 132.5 cm^3 * .01932 kg / cm^3 = 2.561 kg
Note: Water has a density of 1000 kg / m^3 = 1E-3 kg / cm^3
So the equivalent weight of water would be
1.0E-3 kg/cm^3 * 132.5 cm^3 = .132 kg for the water
The specific gravity of the Au is 2.561 / .132 = 19.4 (correct)
Two-pointcharges are 9.0 cm apart. they are moved and the force on each of them is found to have been doubled. how far apart are they now?
After moving, the two point charges are 6.36 cm apart.
We know that,
F = k [tex]q_{1} q_{2}[/tex] / [tex]r^{2}[/tex]
where,
[tex]q_{1} q_{2}[/tex] = two point charges
k = Coulombs constant
r = Distance between two charges
F = Electrostatic force between two charges
Given that,
r = 9 cm
F = k [tex]q_{1} q_{2}[/tex] / [tex]9^{2}[/tex]
[tex]F^{'}[/tex] = 2F
k [tex]q_{1} q_{2}[/tex] / [tex]r'^{2}[/tex] = 2 * k [tex]q_{1} q_{2}[/tex] / [tex]9^{2}[/tex]
[tex]r'^{2}[/tex] = 81 / 2 = 40.5
r' = 6.36 cm
Electrostatic force is the force between two point charges. It can either be positive or negative. If negative the forces are attractive and if positive the forces are repulsive in nature.
Therefore, after moving, the two point charges are 6.36 cm apart.
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In 10 seconds a swimmer kicks off one the side of the pool to the other. as the swimmer makes their way across, they slow down at a constant rate until the come to a complete stop. if the width of the pool is 8.0 meters what was their initial velocity when they kicked off.
1.6 ms-1 was their initial velocity when they kicked off.
The velocity at time interval t = 0 is indicated by the symbol u. It is the speed at which the motion begins. Because the length of the pool is not given, the width is used to estimate the distance travelled;
Length of a swimming pool =8 m
A swimmer crosses it and then makes their way across
Total distance covered =8×2=16 m
Time taken =10 seconds
Initial velocity = distance/ time
=16/10
=1.6 ms-1
Therefore, the initial velocity is 1.6 ms-1. Note the question requested initial velocity since it is impossible to estimate the final velocity of the swimmer as he maintains a constant rate across the pool when swimming back.
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If the reaction is second order in a and first order in b, what is the rate when the initial concentration of [a] = 4.11 mol/l and that of [b] = 3.71 mol/l?
Answer:
New concentration of A =3 [A] Put the values we get new rate of reaction. − dtd[R]=k[3A] 2[B] Hence, the rate of reaction will increase by 9 times. (iii) Given that. New concentrations of A=2[A] New concentration of B=2[B] Plug the values we get.
Explanation:
The rate using the rate constant and the given concentrations [tex]\( \text{rate} = 2.1897 \text{ mol/L.s} \)[/tex].
The rate law for the reaction is given as: [tex]\rm \[ \text{rate} = k \times [a]^2 \times [b] \][/tex]
where:
[tex]\[ [a] = 4.11 \text{ mol/L} \]\\\ [b] = 3.71 \text{ mol/L} \][/tex]
[tex]\rm \[ k \][/tex] is the rate constant (to be determined)
To find the rate, we need to calculate the rate constant [tex](\( k \))[/tex] and then substitute the given concentrations of [tex]\( [a] \)[/tex] and [tex]\( [b] \)[/tex] into the rate law.
Step 1: Calculate the rate constant [tex](\( k \))[/tex] using the provided rate value and concentrations.
[tex]\[ \text{rate} = 2.1897 \text{ mol/L.s} \]\\\[k = \frac{\text{rate}}{[a]^2 \times [b]} \]\[k = \frac{2.1897 \text{ mol/L.s}}{(4.11 \text{ mol/L})^2 \times 3.71 \text{ mol/L}} \][/tex]
Step 2: Calculate the rate using the rate constant and the given concentrations.
[tex]\[ \text{rate} = k \times [a]^2 \times [b] \]\[ \text{rate} = \left(\frac{2.1897 \text{ mol/L.s}}{(4.11 \text{ mol/L})^2 \times 3.71 \text{ mol/L}}\right) \times (4.11 \text{ mol/L})^2 \times 3.71 \text{ mol/L} \]\[ \text{rate} = 2.1897 \text{ mol/L.s} \][/tex]
The correct result is [tex]\( \text{rate} = 2.1897 \text{ mol/L.s} \)[/tex].
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Describe a situation in which you can accelerate even though your speed doesn’t change.
Acceleration is not the same as speeding up. It refers to any modification of motion's direction or speed. Accelerated motion is any movement that is not constant speed in a straight line.
What is meant by acceleration?In physics, acceleration refers to the rate at which an object's velocity over time changes. They are accelerations and vector quantities. The direction of an object's acceleration is determined by the direction of the net force acting on it.
Depending on whether an object is moving faster, slower, or in a different direction, its velocity may change. Examples of acceleration include a falling apple, the moon orbiting the earth, and a car that has stopped at a stop sign.
Acceleration is the measure of a change in velocity. Acceleration frequently, though not always, denotes a shift in speed. The direction of motion is changing, therefore an object moving at a constant speed in a circular path is still moving ahead.
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Calculate the energy of a photon with a wavelength of 410nm.
a) 4.85 x 10-19 j
b) 4.85 x 10-20 j
c) 4.85 x 10-18 j
d) 2.06 x 1019 j
e) 2.06 x 1020 j
The _____ experiences a temperature _____ primarily due to the absorption of _____.
The thermosphere experiences a temperature increase primarily due to the absorption of gamma rays.
What is thermosphere?
The thermosphere is a layer of Earth's atmosphere that is directly above the mesosphere and below the exosphere.
Characteristics of thermosphereThe thermosphere is characterized by high temperature and large variability, in response to changes in solar ultraviolet radiation and solar activity.
Thus, the thermosphere experiences a temperature increase primarily due to the absorption of gamma rays.
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TRUE or FALSE
Organs are composed of multiple tissue types.
Answer:
TRUE
Explanation:
Organs are made of two or more tissue types to allow them to function.
Hope this helps! :D
Choose the correct wavelength (405 or 500 nm) based on your evaluation of the absorption spectrum just taken. explain the correct choice of wavelength.
The correct answer for the wavelength (405 or 500 nm) based on our evaluation of the absorption spectrum just taken is 405 nm which is Fluorescence .
Fluorescence diagnosis could improve the safety and reliability of stereotactic brain tumor biopsies performed with biopsy needles equipped with integrated fiber optics. Vital tumor tissue can be localized in vivo during the excision procedure using 5-aminolevulinic-acid-induced protoporphyrin IX (PpIX) fluorescence, reducing the number of samples required for a reliable diagnosis. On optical phantoms, the practical suitability of two different PpIX excitation wavelengths (405 nm, 633 nm) was investigated. Violet excitation at 405 nm provides a 50-fold increase in sensitivity for the bulk tumor; ray tracing simulations show that this factor increases up to 100 with decreasing fluorescent volume.
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If your engine is flooded with gasoline, you should push the ____ to the floor and hold for _____.
a. accelerator, 5 seconds
b. accelerator, 1 minute
c. brake, 1 minute
d. brake, 5 seconds
If your engine is flooded with gasoline, you should push the brake, to the floor and hold for 5 seconds.
What is gasoline?Gasoline or petrol is a transparent, petroleum-derived flammable liquid that is used primarily as a fuel in most spark-ignited internal combustion engines. Gasoline is already considered frozen if it turns into a thick sludge or wax. To totally avoid frozen gasoline inside the car, focus on preventing the fuel line from freezing during winter. Stale gasoline can be dangerous as it contains a combination of over 150 chemicals that can destroy both animal and human lives. Gasoline vapors are heavier than air, so they settle on the ground and travel like a liquid. Because of this, they often find their way into drains, basements, and sewer lines.
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During an adiabatic compression a volume of an air decrease to 1/4 th its original size calculate its final pressure if its original pressure was 1 atm
The final pressure is 6.96 atm.
We know that in an adiabatic process,
[tex]p_{1} V_{1} ^{gamma}[/tex] = [tex]p_{2} V_{2} ^{gamma}[/tex]
where,
p = Pressure
V = Volume
Gamma = Isentropic expansion factor
Given that,
[tex]p_{1}[/tex] = 1 atm
γ = 1.4 ( Assuming the air as an ideal gas )
[tex]V_{2}[/tex] = [tex]V_{1}[/tex] / 4
[tex]V_{1}[/tex] / [tex]V_{2}[/tex] = 4
[tex]p_{1} V_{1} ^{1.4}[/tex] = [tex]p_{2} V_{2} ^{1.4}[/tex]
[tex]p_{2}[/tex] = 1 * [tex]( 4 )^{1.4}[/tex] = 6.96 atm
An adiabatic process is a thermodynamic process without the involvement of heat. Usually it takes place in an insulated box.
Therefore, the final pressure is 6.96 atm
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Consider heat transfer through a wall of a house (no window) on a winter day. what parameters affect the rate of heat conduction through the wall?
Heat conduction parameters affect the rate of heat conduction through the wall.
What is heat conduction parameters?The interaction by which intensity is moved from the more blazing finish to the colder finish of item is known as conduction. Heat precipitously moves from a sultrier body to a colder body. For instance, heat is directed from the hotplate of an electric oven to the lower part of a pan in touch with it. Without a contradicting outside driving energy source, inside a body or between bodies, temperature contrasts rot after some time, and warm balance is drawn nearer, temperature turning out to be more uniform. The course of intensity conduction relies upon four fundamental factors, the temperature angle, the cross segment of the materials in question, their way length, and the properties of those materials. A temperature slope is an actual amount that depicts in which heading and at what rate the temperature changes in a particular area.
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A defibrillator connected to a patient passes 16.0 a of current through the torso for 0.0200 s. how much charge moves?
A defibrillator connected to a patient passes 16.0 a of current through the torso for 0.0200 s. A charge of 0.32C moves.
CalculationDefibrillator passes 16A through the torso of an individual
The time is 0.0200
The charge can be calculated as follows
= I × t
= 16 × 0.0200
= 0.32C
What is a defibrillator?Defibrillators can also restart an abruptly stopped heart. The sole therapy for someone in cardiac arrest is defibrillation. Rapid defibrillation is essential for survival and one of the most important measures in saving a life from Sudden Cardiac Arrest because a person’s chances of survival decrease by 7–10% for each minute that they do not receive it.
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A robot used in a pharmacy picks up a medicine bottle at t=0. it accelerates at 0.30 m/s2 for 3.5 s , then travels without acceleration for 74 s and finally decelerates at -0.60 m/s2 for 1.8 s to reach the counter where the pharmacist will take the medicine from the robot.
What does Newton's third law describe?
Any substance or mixture of substances intended for the cure, mitigation, diagnosis, or prevention of disease is a(n) ____
Any substance or mixture of substances intended for the cure, mitigation, diagnosis, or prevention of disease is a drug.
What is diagnosis?The process of determining which disease or condition is to blame for a person's symptoms and signs is known as medical diagnosis. The term "diagnostic" is most frequently used, with the implied reference to medicine. The history and physical examination of the patient who is seeking medical attention often yield the data needed for diagnosis. The process frequently includes one or more diagnostic procedures as well, such doing medical testing. Posthumous diagnosis is occasionally seen as a type of medical diagnosis.
Due to the vague nature of many symptoms and indicators, diagnosis is frequently difficult. For instance, skin redness (erythema), when present alone, is a symptom of numerous illnesses and cannot be used to diagnose a patient's condition.
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In diving to a depth of 374 m, an elephant seal also moves 311 m due east of his starting point. what is the magnitude of the seal's displacement?
The magnitude of the seal's displacement will be 486.41m
What is the concept of displacement?There are an endless number of paths that can be built between two places. The distance is the name given to any specific length of path. There is a path with the shortest distance out of all of these, and the length of that path is determined by the size of a properly specified vector quantity called the displacement.
Given that an elephant seal goes 311 m to the east of his starting location when diving to a depth of 374 m.
Allow the seal to begin at point A and dive deep to reach position B. In the illustration below, his displacement is highlighted in red:
The hypotenuse of the right triangle ABC can be located to determine the displacement's magnitude.
We discover:
displacement of the seal = [tex]\sqrt374^{2} +311^{2} = 486.41m[/tex]
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An ohmmeter should be connected to the circuit or component being tested ________.
If the mass of an object is 14 lbm, what is its weight, in lbf, at a location where g = 32.0 ft/s2?
The mass of the object is 13.924 lbf.
CalculationUsing the formula:
w = m x g ....... eq1
here w is weight of the object.
m is mass of the object, and
g is the acceleration of gravity.
mass, m = 14 lbm (given)
acceleration of gravity, g= 32.0 ft/[tex]s^{2}[/tex]
Now, substituting the values in equation (1):
w = 14lbm x 32.0 ft/[tex]s^{2}[/tex] = 448 lbm ft/[tex]s^{2}[/tex]
since, 1 lbf = 32.174 lbm ft/[tex]s^{2}[/tex]
so, w = 448 x [tex]\frac{1}{32.174}[/tex]
w = 13.924lbf
Hence, the mass of an object is 13.924 lbf.
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What simple way of interpretataing astronomical observations did copenicus advicate?
Nicolaus Copernicus advocated that the Earth and all other planets orbits around the sun in circular paths at uniform speeds.
Nicolaus Copernicus named this model as Copernicus's Heliocentric Model in 1543. Until his theory was published, it was believed that the Earth is the center of the solar system and the sun moves around it.
The mistake in his theory is that the orbits are circle in shape whereas the correct shape is elliptical which was later corrected by Kepler's model in 1609 which was later proved by Galileo Galilei with the help of telescope.
Therefore, Nicolaus Copernicus advocated that the Earth and all other planets orbits around the sun in circular paths at uniform speeds.
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A parallel plate capacitor of capacitance c0 has plates of area a with separation d between them. When it is connected to a battery of voltage v0, it has charge of magnitude q0 on its plates. While it is connected to the battery, the space between the plates is filled with a material of dielectric constant 3. After the dielectric is added, the magnitude of the charge on the plates and the new capacitance are.
The dielectric strength of a dielectric substance is equal to the greatest magnitude of the external electric field that does not cause electrical breakdown. When an electric field is applied to a dielectric, the dielectric will transform into a conductor at a point known as electrical break down.
Given that
A parallel plate capacitor consists:
Capacitance Co
Plates of Area A
Separation distance between the plates d
Voltage of a battery Vo
Magnitude of charge Qo
Dielectric constant K=3
the capacitance of parallel plate capacitor when there is free space between the plates is given by
Co = εoA/d
Where εo is permittivity of free space.
If the battery is connected to the parallel plate capacitor, the gap between the plates is filled with dielectric constant. The capacitance of the parallel plate capacitor for the medium will then be determined.
a) C=KεoA/d
=3εoA /d
=3 Co
Now, the potential difference between the plates will be
b) Vo =QC
Vo=QC
Hence, the magnitude of charge by adding dielectric medium will be
c) Q= CVo
=3εoA Vo /d
=3 Co Vo
=3 Qo
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The platofm on the school stage is 8 3/4 feet wide. each chair is 1 5/12 feet wide. how many chairs will fit acroos the platform?
6 chairs will fit across the platform.
CalculationWe have a school stage of 8 3/4 feet wide.
It's also given that each chair is 1 5/12 feet wide.
To find out the number of chairs possible we can simply divide the total length available by width of the chair.
8 3/4 = 35/4
1 5/12 =17/12
So, 35/4 / 17/12
So, the final answer comes up to 6.
so, the total number of chairs that would fit in are 6.
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Express the integral as a limit of riemann sums using right endpoints. do not evaluate the limit. 3 6 x2 dx 1 find the width of each subinterval in terms of n.
The integral as a limit of Riemann sums using right endpoints is =lim (n→∞) n ∑i=1[(ln(1+(4+8i/n)2)−sin(4+8i/n))8/n].
Definite integralThe definite integral is defined here in terms of its limit.
So the definite integral goes as follows.
∫f(x)dx= lim(n→∞) n∑i=1 f(xi)Δx.
Where, for each positive integer n, we let Δx=(b−a) /n
And in case of i=1,2, 3..., n, we let xi=a+iΔx.
For Δx
For each n, we get
Δx=(b−a)/n= (12−4)/n=8/n
For xi
Xi = a+iΔx = 4+i8/n=4+8i/n
For f(xi)
∫124 [ln(1+x2) −sin x] dx
=lim (n→∞) n ∑i=1[(ln(1+(4+8i/n)2)−sin(4+8i/n))8/n]
What is integral?The Riemann integral, developed by Bernhard Riemann, was the first exact formulation of the integral of a function over an interval in the field of mathematics known as real analysis.
It was presented to the faculty at the University of Göttingen in 1854, but it wasn’t until 1868 that it was published in a journal.
The Riemann integral can be found using the calculus fundamental theorem for a variety of functions and real-world situations, or it can be roughly approximated using numerical integration.
The Riemann integralThe Riemann integral can be thought of as the limit of a function’s Riemann sums as the finer the partitions are.
The function is referred to as being integrable if the limit exists (or more specifically Riemann-integrable). By making the partition fine enough, the Riemann sum can be brought as close as desired to the Riemann integral.
The mesh of the partitions must, among other things, get smaller and smaller until, at the limit, it is zero.
If this were not the case, then on specific subintervals, we would not be receiving a fair approximation to the function. Actually, this is sufficient to define an integral.
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The last quarter phase of the moon? rises at sunrise. rises at sunset. sets at sunset. crosses the meridian at sunrise. sets at sunrise.
The correct answer for the The last quarter phase of the moon is it crosses the meridian at sunrise .
A third quarter moon, or last quarter moon, rises around midnight and sets around noon. The Moon is nearly back to the point in its orbit where its dayside faces the Sun directly, and all we see from our vantage point is a thin curve.
The Last or Third Quarter is when we can see half of the Moon's illuminated portion and half of its shadow portion. This is why this phase is commonly referred to as Half Moon. We can only see half of the Moon because it is at a 90-degree angle to the Earth and Sun.
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