The __________ notation of entity-relationship modelling can be used for both conceptual and implementation modelling.
a. Bachman
b. UML
c. Chen
d. Crow's Foot

Explanation:

VT= 10 v

IT = V/R = 10/5= 2 A

RT= 5 ohm

PT = 20w

\( {i}^{2} \times r = {2}^{2} \times 5 = 20watts\)

The extreme values of the function subject to the given constraint is C. Maximum: 4 at (0,1); minimum: -4 at (0, -1).

To find the extreme values of the function f(x, y) = x² + 4y³ subject to the constraint x² + 2y² = 2, use the method of Lagrange multipliers.

Define the Lagrangian function L(x, y, λ) as follows:

L(x, y, λ) = f(x, y) - λ(g(x, y))

Where g(x, y) = constraint, which is x² + 2y² - 2.

Now, find the critical points of L(x, y, λ) by taking partial derivatives with respect to x, y, and λ, and setting them equal to zero:

∂L/∂x = 2x - 2λx = 0 (1)

∂L/∂y = 12y² - 4λy = 0 (2)

∂L/∂λ = -(x² + 2y² - 2) = 0 (3)

From equation (1):

2x - 2λx = 0

x(1 - λ) = 0

This gives two possibilities:

x = 0

1 - λ = 0 => λ = 1

If x = 0, then substituting into equation (2):

12y² - 4λy = 0

12y² - 4y = 0

4y(3y - 1) = 0

This gives us two possibilities:

y = 0

3y - 1 = 0 → y = 1/3

Therefore, the critical points: (0, 0) and (0, 1/3).

Now, examine the points that satisfy equation (3):

For (0, 0):

0² + 2(0²) - 2 = -2 ≠ 0

For (0, 1/3):

0² + 2(1/3)² - 2 = 0

Therefore, the point (0, 1/3) satisfies the constraint.

Now, evaluate the function f(x, y) at the critical points:

For (0, 0):

f(0, 0) = (0²) + 4(0³) = 0

For (0, 1/3):

f(0, 1/3) = (0²) + 4(1/3)³ = 4/27

Comparing the values, the maximum value is 4/27 at (0, 1/3) and the minimum value is 0 at (0, 0).

Therefore, the correct answer is:

C. Maximum: 4/27 at (0, 1/3); minimum: 0 at (0, 0)

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True. The right-hand rule can be used to determine the direction of deflection of an electron beam in a magnetic field. By aligning the thumb, fingers, and palm, the rule can indicate the direction of the deflection.

True. The right-hand rule is a useful tool in determining the direction of deflection of an electron beam in a magnetic field. When the thumb, fingers, and palm of the right hand are used, the thumb represents the direction of the electron's velocity, the fingers indicate the direction of the magnetic field, and the palm points towards the direction of the resulting force or deflection. By applying the right-hand rule, one can determine whether the electron beam will be deflected to the left or right, perpendicular to both the direction of the electron's motion and the magnetic field. This rule is based on the principles of electromagnetism and is widely used in physics and engineering applications.

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After reducing the dimensions, the new resistance of the rectangular block will be three times of the initial value.

Let us assume that initially dimensional conditions of the rectangular blocks are like this,

B is breadth,

L is length,

H is the height,

p is the resistivity.

Now, the resistance will be given by,

R = pL/(BxH)

Now, when the dimension are reduced to a third of the initial values, we get new resistance,

R' = (pL/3)/(BxH/9)

R' = 3pL/(BxH)

Putting R = pL/(BxH),

R' = 3R

So, the new resistance will be three times of the initial value.

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Answer:

120°

Explanation:

Given forces with magnitude F and F

Applying the parallelogram law of vector

Where resultant is given as :

R = √(A^2 + B^2 + 2ABCos Ф

WHERE A and B are two forces with angle Ф

F =√(F^2 + F^2 + 2F * F Cos Ф

Square both sides

F^2 = F^2 + F^2 + 2F^2 CosФ

F^2 - 2F^2 = 2F^2 CosФ

- F^2 = 2F^2 Cos Ф

Divide both sides by 2F^2

- 1 / 2 = CosФ

Cosine(theta) = - 1/2

Ф = cosi^-1 (-1/2)

Ф = 120°

Answer:

A carpet transfers more energy to heat than the floor, I believe.

Explanation:

There is more friction on the carpet creating more heat and energy loss. Potential energy is gained from being at a higher elevation.

The distance around the rectangular field is 128.88 m.

Perimeter is the total distance around an object.

To calculate the perimeter/ total distance around the rectangular field, we us the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the distance around the rectangular field is 128.88 m.

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Answer:

Principle Archimedes is applied in building a ship and submarine using the manipulating that buoyancy, is controlled the ballast tank system.

Explanation:

Submarine is rather had they focused on main parts of the submarine,he is complex and long process implementation,the most submarine design like submarine stability.

Submarine stability is complete and the fundamental Archimedes principle to arrive the weight of submarine is equal to buoyancy force.

Submarine into the parts and components of ballast tank the sequence in diving and surfacing,there two vital parts:-  flood parts and air vents

flood parts:- at the bottom position and allow water to enter or leave that tank.

air vents:- air vents at the top of the pressure hall,and that they submarine dive.

this time submarine is most modern system is depth is 300 to 450 meters,high pressure  air is 15 bar is tank air valve.

submarine is basic of the effective volume of all the submarine surfaced condition,submarine minus to the free water flood is equal to the fully pressure hull,submarine is the surfaced condition.

a)  q_shell = -Q ,  b)  q_shell = -Q

a) We can solve this exercise using Gauss's law

Ф = ∫ E. dA =  /ε₀

For this we use a Gaussian surface that takes advantage of the symmetry of the problem, we select a sphere where this force of the spherical plastic shell.

In this case, the electric field lines coincide with the radii of the sphere and the scalar product reduces to the algebraic product, the area of ​​the sphere

     A = 4 π r²

fi = E 4π r² = q_{int} /ε₀

apply this formula to our case, we have that the charge inside the Gaussian sphere is

   q_{int} = q_sphere + q_shell

the charge of the sphere is Q and the requirement is that there is no electric field outside the Gaussian sphere, for this, the net charge inside it must be zero

      0 = Q + q_shell

      q_shell = -Q

b) In Gauss's law, only the charge inside the Gaussian surface matters, not its position, therefore if the charge is not in the center the result remains the same.

     q_shell = -Q

Please check the attached attachment for the detailed answer.

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Answer:

Measurement is the competion of known quantity to unknown quantity.

Explanation:

I hope that it will be right answer

Answer:

Measurement standard is relationship of a physical quantity.

Explanation:

Measurement standard is the fundamental reference and measuring the compared the device, these reference is controlled to the objects conditions to the physical quantity.

When silver sulfide (Ag2S) reacts with hydrochloric acid (HCl), it forms silver chloride (AgCl) and hydrogen sulfide gas (H2S). To calculate the mass of silver chloride formed, we need to use the balanced chemical equation and the molar masses of the compounds involved.

The balanced chemical equation for the reaction is:
Ag2S + 2HCl → 2AgCl + H2S

From the equation, we can see that 1 mole of silver sulfide reacts to form 2 moles of silver chloride. To find the number of moles of silver chloride formed, we need to convert the mass of silver sulfide given (215 g) into moles.

First, find the molar mass of silver sulfide:
Ag2S = 2(107.87 g/mol) + 32.07 g/mol = 247.61 g/mol

Now, calculate the number of moles of silver sulfide:
Moles of Ag2S = Mass of Ag2S / Molar mass of Ag2S
Moles of Ag2S = 215 g / 247.61 g/mol ≈ 0.868 mol

Since 1 mole of silver sulfide forms 2 moles of silver chloride, the number of moles of silver chloride formed is double that of silver sulfide. Therefore, the moles of silver chloride formed is:
Moles of AgCl = 2 × Moles of Ag2S
Moles of AgCl = 2 × 0.868 mol = 1.736 mol

To calculate the mass of silver chloride formed, multiply the number of moles by its molar mass:
Mass of AgCl = Moles of AgCl × Molar mass of AgCl
Mass of AgCl = 1.736 mol × (107.87 g/mol) = 187.32 g

Therefore, the mass of silver chloride formed when 215 g of silver sulfide reacts with excess hydrochloric acid is approximately 187.32 grams.

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Answer:

1 is true  4 is false 5 is c i think 6 is a 7 is c 3 is a 2 is c 8 is c 9 is true 10 is c

Explanation:

Answer with explanation

a) Formula to find the current that passes through a circuit is :

Given that,

Voltage = 45V

Resistance = 39Ω

Current =?

Let us find it now.

V = I × R

45V = I × 39Ω

Divide both sides by 39.

1.153A = I = Current

b) Formula to find the energy is:

            = 45V × 1.153A × ( 5 × 60)s

            = 15565.5 J

            = 15.5655kJ

To build a smaller resistance, you can either decrease the length or increase the cross-sectional area of the conductor. To build a larger resistance, you can either increase the length or decrease the cross-sectional area. In a series connection where the total resistance is higher, the rate of Joule heating is greater compared to a parallel connection where the total resistance is lower.

The resistance of a conductor depends on its length, cross-sectional area, and resistivity. To build a smaller resistance, one can decrease the length of the conductor or increase its cross-sectional area. Conversely, to build a larger resistance, one can increase the length or decrease the cross-sectional area.

When resistances are connected in series, the total resistance is the sum of the individual resistances. Therefore, if you have two resistances in series, the overall resistance will be higher compared to each individual resistance. On the other hand, when resistances are connected in parallel, the total resistance is less than the smallest individual resistance. This is because the current has multiple paths to flow through, resulting in a lower overall resistance.

The rate of Joule heating, which is the heat generated in a conductor due to the flow of electric current, is directly proportional to the resistance. Therefore, in a series connection where the total resistance is higher, the rate of Joule heating is greater compared to a parallel connection where the total resistance is lower. This is because higher resistance leads to a higher rate of energy dissipation in the form of heat.

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Answer:

f= 6.59x10^14

Explanation:

please see attached and don't forget to rate if it helps

Blue light has a wavelength of 455 nanometers, then its frequency would be 6.5934 ×10¹⁴ Hertz.

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

The wavelength is inversely proportional to the frequency of the wave as from the following relation.

C = νλ

where c is the speed of the light having a value of 3 ×10⁸ meters/second.

As given in the problem if Blue light has a wavelength of 455 nanometers, then we have to find out its wavelength,

speed of light = wavelength ×frquency

3 ×10⁸ meters/second  = 455 ×10⁻⁹ ×frquency

frequency  = 3 ×10⁸/455 ×10⁻⁹

                  =6.5934 ×10¹⁴

Thus, the frequency of the wave would be 6.5934 ×10¹⁴ Hertz.

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Answer:

Explanation:

Impulse = Force × time

So 88× 3 =264!!

Answer:

264 kg*m/s

Explanation:

Answer:

encyclopedia most reliable I think

Answer:

enjoy

Explanation:

The number of time a cricket chirps in a minute is a function of the temperature in the formula: n=4t-160, where n=number of times a cricket chirps a minute and t=temperature in farenheit. You can use the temperature t=(1/4)n+40 to estimate the temperature based on the number of chirps per minute.

The circuit consists of two main components, a 9V battery and a 100Ω resistor.

A component is a part or element of a larger system. In computing, components are pieces of software that have a well-defined interface and provide a specific service or function. Components are often modular, meaning they can be reused in different applications or systems. They are also meant to be extensible, making it easier to add additional features or modify existing ones.

The circuit is sketched below, with the 9V battery connected to the resistor, and the resistor connected back to the negative terminal of the battery. The multimeter is used to verify the values of the components, with the battery voltage being measured at 9V and the resistor resistance being measured at 100Ω.  

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In astronomy, the term bipolar refers to outflows that are ejected from a central source in two opposite directions.

These outflows are characterized by a symmetrical structure with two lobes, hence the term "bipolar." They are commonly observed in various astrophysical objects, such as young stars, planetary nebulae, and active galactic nuclei.

Bipolar outflows play a crucial role in the evolution of these objects by carrying away mass and energy. They are believed to be driven by powerful processes, such as accretion onto a central object or the presence of a binary system. The study of bipolar outflows provides valuable insights into the underlying physical mechanisms and helps astronomers better understand the formation and evolution of celestial bodies.

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Answer:

Oh god

i have nooooo idea

A fully charged HV battery should show voltage levels to within 3% of specifications.

A High Voltage (HV) Battery is an electric vehicle's most crucial component. HV batteries are responsible for propelling electric cars by producing power. As a result, a fully charged HV battery should display voltage levels to within 3% of the specifications to provide maximum performance and lifespan. The voltage levels of the HV battery are monitored by the Battery Management System (BMS) (BMS).The Battery Management System (BMS) (BMS) is the electric vehicle's computerized system that monitors the battery's performance, safeguards it against damage, and informs the driver of any system issues. The BMS uses voltage and current sensors to monitor the battery's state of charge and power output in real-time. The Battery Management System (BMS) calculates the battery's available power and energy and its state of charge based on the monitored data.The Voltage level of a battery shows the strength of the battery. If a battery's voltage level is low, it means that the battery is weak and will not last long. Therefore, a fully charged HV battery should show voltage levels to within 3% of specifications to provide the best performance and lifespan. Any deviation from this range will decrease the battery's overall performance and lifespan.

A fully charged HV battery should show voltage levels to within 3% of the specifications to provide maximum performance and lifespan. The Battery Management System (BMS) monitors the voltage levels of the battery to ensure that it is functioning correctly. If the battery's voltage level is below the specified range, it will impact the battery's overall performance and lifespan.

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Answer:

Golf

Explanation:

Golf is NOT considered an invasion game or sport

Answer: 28.71 km

Explanation:

For the convex mirror (ocean):

Radius of curvature = 6.4*10^3 km

Focal length (f) = R/2 = 3.2*10^3 km

Object distance (u) = -3.84*10^5

Mirror formula: \(\frac{1}{u} + \frac{1}{v} = \frac{1}{f}\)

\(\frac{1}{u} + \frac{1}{v} = \frac{1}{f}\)

\(\frac{-1}{3.84*10^5} + \frac{1}{v} = \frac{1}{3.2*10^3}\)

v = 3173.55km

Magnification, \(m = \frac{-v}{u} = \frac{-3173.55}{-3.84*10^5} = \frac{h_{i} }{h_{o} }\)

So, height of image/height of object = 3173.55/3.84*10^5

Diameter of image = 3173.55/3.84*10^5 * 3475

Diameter of image = 28.71 km

Therefore, the diameter of the image is 28.71 km

Answer:

D

Explanation:

Deep sea and sea floor marine habitats would have the least access to primary producers. The correct option is (d).

Primary producers would have the least access to habitats in the deep sea and on the ocean floor. Primary producers are animals and plants that can use sunlight as an energy source to photosynthesize and make their own food, including algae and phytoplankton.

Because of the depth of the water, light penetration is constrained in the deep sea and sea floor settings, making it difficult for creatures that rely on photosynthesis to survive.

In comparison to other maritime ecosystems, where sunlight is more easily obtainable, such as coral reefs, lagoons, salt marshes, estuaries, mangroves, and intertidal zones, these habitats often have lower amounts of primary production.

Therefore, The correct option is (d) deep sea and sea floor.

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The density(D) of the solvent is 1381.22 kg/m³. Answer: 1381.22 kg/m³.

Given that the radius of the cylindrical storage tank is 1.01 m, and when it's filled to a height of 3.30 m, it holds 14700 kg of a liquid industrial solvent(LIS). To find the density of the solvent, we use the formula: Density = mass/volume. Here, the volume of the cylindrical tank is given by the formula: V = πr²h, radius(r) and height(h) of the tank. Substituting the values, we get: V = π × (1.01 m)² × (3.30 m)= 10.65 m³Density = mass/volume = 14700 kg / 10.65 m³ = 1381.22 kg/m³.

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In words, the R2 of 0.27 means that 27% of the variability in y (24-hour urinary Na) can be explained by x (estimated 24-hour urinary Na) obtained from casual urine specimens at one point in time.

The INTERSALT Study was designed to investigate the relationship between dietary sodium and blood pressure (hypertension) in populations worldwide.

The study included 10,079 men and women from 52 population samples in 32 countries. One of the goals of the study was to quantify the relationship between 24-hour urinary Na (y) and estimated 24-hour urinary Na (x) obtained from casual urine specimens at one point in time.

The investigators presented a simple linear regression of y on x, separately for men and women. The regression equation for men was: Y = 1.03x + 7.19, with R2 = 0.27, n = 1369.

The coefficient of determination, R2, is a statistical measure that represents the proportion of the variance for a dependent variable (y) that's explained by an independent variable (x) or variables in a regression model.

In this case, the R2 of 0.27 means that 27% of the variability in y (24-hour urinary Na) can be explained by x (estimated 24-hour urinary Na) obtained from casual urine specimens at one point in time. The remaining 73% of the variability in y is due to other factors that are not included in the regression model.

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Answer:

I do drink bottled water but not to often, I live about 2.8 miles away from its water source and if i did'nt drink bottled water and I had to found out how my drinking water is treated I would go ask the people that are taking care of the water.

Explanation:

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