Explain how cross-linking changes the properties of a polymer.

Answer:

Machine C has the highest efficiency with 75%.

Explanation:

Answer:

Solution given:

No of waves[N] =20crests & 20 troughs

=20waves

Time[T]=4seconds

distance[d]=3cm=0.03m

Now

Wave length=3cm=3 × \( {10}^{ - 2}m \)

Frequency=\( \frac{No of waves}{time}\)

=\( \frac{20}{4} \)=5Hertz

and

Wave speed:wave length×frequency=3 × \( {10}^{ - 2}m \)×5=1.5 × \( {10}^{ - 1} \tt{ {ms}^{ - 1}} \).

The focal length and the power of a lens that will correct this myopia when worn 2.0 cm in front of the eye is 16 cm and 6.25 diopters, respectively.

To correct the myopia of the physicist's left eye, we'll need to find the focal length and power of the corrective lens. The lens formula is:

1/f = 1/u + 1/v

where f is the focal length, u is the object distance, and v is the image distance. In this case, the eye can see clearly up to a distance of 33 cm (u), and the corrective lens is placed 2 cm in front of the eye, so the image distance (v) will be 33 cm - 2 cm = 31 cm.

Now, we can plug the values into the formula:

1/f = 1/33 + 1/31

To solve for f, we'll first find the common denominator, which is 33 * 31:

1/f = (31 + 33) / (33 * 31)

1/f = 64 / 1023

Now, we can find the focal length (f):

f = 1023 / 64 ≈ 16 cm

Next, we'll find the power (P) of the lens, which is the inverse of the focal length (in meters):

P = 1/f (in meters)

Since 16 cm is equivalent to 0.16 m, we can calculate the power:

P = 1/0.16 = 6.25 diopters

So, the corrective lens should have a focal length of approximately 16 cm and a power of 6.25 diopters to correct the myopia of the physicist's left eye.

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Breaking the sound barrier, which is the transition from subsonic to supersonic speed, presented several challenges and obstacles for scientists and engineers. Some of the obstacles faced were:

1. Aerodynamic forces: As an aircraft approaches the speed of sound, it encounters a range of aerodynamic forces that can cause instability and vibrations. These forces include shock waves, which can create areas of high pressure and drag on the aircraft, making it difficult to maintain control.

2. Engine power: Breaking the sound barrier requires a significant amount of engine power to overcome the drag and other aerodynamic forces. Developing engines that were powerful enough to achieve supersonic speeds was a major challenge for scientists and engineers.

3. Structural integrity: The shock waves and other forces encountered during supersonic flight can place significant stress on an aircraft's structure, potentially leading to failure or damage. Designing and building aircraft that could withstand these forces was a major challenge.

4. Instrumentation: To safely break the sound barrier, pilots need accurate and reliable instrumentation to monitor the aircraft's speed, altitude, and other critical parameters.

Developing instrumentation that could function reliably at supersonic speeds was another obstacle that scientists and engineers had to overcome.

In summary, breaking the sound barrier presented several challenges and obstacles, including aerodynamic forces, engine power, structural integrity, and instrumentation. Overcoming these obstacles required significant advances in technology and engineering.

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Make sure your calculator is in degree mode.
The direction of the net momentum is θ degrees measured clockwise from the north to the west.

To determine the direction of the net momentum, follow these steps:
Step 1: Identify the momentum components
Since the question does not provide specific information about the magnitudes or directions of the individual momenta, let's assume that we have two momenta: momentum A pointing north, and momentum B pointing west.

We can represent them as vector quantities A and B, respectively.
Step 2: Find the horizontal (westward) and vertical (northward) components of the net momentum
The horizontal component of the net momentum is the westward momentum (momentum B).

The vertical component of the net momentum is the northward momentum (momentum A).
Step 3: Use the Pythagorean theorem to find the magnitude of the net momentum
The magnitude of the net momentum (C) can be found by using the Pythagorean theorem: \(C^2 = A^2 + B^2.\)

Take the square root of both sides to find the magnitude of the net momentum: \(C = sqrt(A^2 + B^2).\)
Step 4: Use trigonometry to find the direction of the net momentum
To find the direction of the net momentum, we need to calculate the angle between the net momentum and the north direction, measured clockwise.

We can use the tangent function in trigonometry for this purpose: tan(θ) = B/A,

where θ is the angle between the net momentum and the north direction.
Step 5: Calculate the angle in degrees
To find the angle in degrees, take the inverse tangent (arctan) of the ratio B/A: θ = arctan(B/A).

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To solve this problem, we need to use the equation for rotational motion he reel undergoes an angular acceleration of approximately 3.42 rad/s^2 when.

Acceleration is defined as the rate of change of velocity with respect to time. It is usually denoted by the symbol a and is a vector quantity, meaning it has both magnitude and direction.The SI unit of acceleration is meters per second squared (m/s^2). If an object's velocity changes by Δv in a time interval of Δt, the acceleration In three-dimensional motion, acceleration is a vector quantity with components in each coordinate direction. The total acceleration vector can be found by taking the vector sum of the acceleration components in each direction.Acceleration plays an important role in physics, as it describes the changes in motion of objects due to the influence of forces. For example, in classical mechanics, Newton's second law states that the force acting on an object is equal to its mass times its acceleration. In this way, acceleration can be used to describe the motion of objects subject to forces such as gravity, friction, and electromagnetic fields.

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Answer:

11760 J

Explanation:

cuz potential engery is PE = MHG

SO 80×15×9.8= 11760 J

Answer:

11769j

Explanation:

here,

mass(m)=80 kg

height(h)=15m

acceleration due to gravity(g)=9.8m/s^2

now,

potential energy = m×g×h

= 80×9.8×15

= 11760j

KCL stands for Potassium Chloride

Melting and Boiling points of few ionic compounds:-

\(\boxed{\begin{array}{|c|c|c|c|} \cline {1-4}\Large\sf {Ionic\:Compounds} & \sf \Large {Chemical\:Formula} & \Large \sf{Melting\:point_{(k)}} & \Large\sf {Boiling\:point_{(k)}} \\ &&& \\ \cline {1-4} \sf Sodium\:Chloride & \sf NaCl & 1074 & 1686 \\ &&& \\ \cline {1-4} \sf Lithium\:Chloride & \sf \sf LiCl & 887 & 1600 \\ &&& \\ \cline {1-4} \sf Calcium\:Chloride & \sf CaCl_2 & 1045 & 1900 \\ &&& \\ \cline {1-4} \sf Calcium\:Oxide & \sf CaO & 2850 & 3120 \\ &&& \\ \cline {1-4} \sf Magnesium\:Chloride & \sf MgCl_2 & 981 & 1685 \\ &&& \\ \cline {1-4} \end{array}}\)

Answer:

potassium chloride

Explanation:

K-potassium

Cl-chloride ion

Negatively charged particles found in shells around the nucleus of a particular atom are called electrons.

Electrons are subatomic particles that have a negative charge, and they are found in the electron shells surrounding the nucleus of an atom. The number of electrons in an atom is equal to the number of protons in the nucleus, which helps to keep the atom electrically neutral. Electrons are responsible for many of the properties of atoms, including chemical reactivity.

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The net electric potential at point P due to the four particles would be Vtotal=5.5625×10−4Nm/C.

Electric field is a vector quantity, while electric potential is a scalar quantity. So, in order to find the electric potential on a point due to several other point charges, we will make a sum of their individual electric potential with respect to the point charge. So, to find the electric potential on point P due to the other point charges, we can find the electric potential of each point charge on P and add them, V=V1+V2+V3+V4

The electric potential of charges at either side of point P on P will be given by,

V1=V2=k(+q)d

In the same way, the electric potential on point P, due to the third charge,

V3=k(−q)2d

And the electric potential on point P due to fourth charge will be,

V4=k(−q)d

We know that electric potential is a scalar quantity, thus the total electric potential on point P is simply the sum of all the electric potentials on point P, V=V1+V2+V3+V4

Vtotal=k(+q)/d+k(+q)/d+k(−q)/2d+k(−q)/d

Vtotal=kq[(+1)/d+(+1)/d+(−1)/2d+(−1)/d]

Substituting the value of k=1/4πε0

and solving,

Vtotal=   [ (2+2−1−2)/2d]

Vtotal=   [(1)/2d]

We also know that the q=5.00fC=5×10⁻¹⁵C

, d=4.00cm=4×10⁻²m

and the value of the electrostatic constant, k=1/4πε0=8.996×10⁹Nm2C−2

Vtotal=8.996×10⁹Nm2C−2×5×10⁻¹⁵C[(1)2×4×10⁻²m]

Solving for Vtotal

we get,

Vtotal=5.5625×10⁻⁴Nm/C.

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The operator's effort when pulling the rope over a 5 m distance with a 600 N force would be 3000 Nm (Newton meters).

In this instance, the applied force is 600N, and the separation is 5m. The cosine of a 0-degree angle is 1, assuming the force is applied in the direction of the displacement (angle of 0 degrees).

As a result, the work completed can be calculated as:

W=600Nx5mx1 = 3000 Nm

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To react completely with 0.500 L of volume of 0.500 M Na2CO3, you would need 0.250 L of 2.00 M HCl.

Write down the balanced chemical equation for the reaction between HCl and Na2CO3:

2 HCl + Na2CO3 → 2 NaCl + H2O + CO2

Determine the stoichiometry of the reaction:

From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Na2CO3.

Calculate the number of moles of Na2CO3:

Given that the volume of Na2CO3 solution is 0.500 L and the concentration is 0.500 M, we can use the formula:

Moles = Concentration × Volume

Moles of Na2CO3 = 0.500 M × 0.500 L = 0.250 moles

Use the stoichiometry to determine the number of moles of HCl needed:

According to the stoichiometry of the balanced equation, 1 mole of Na2CO3 reacts with 2 moles of HCl.

Therefore, to react with 0.250 moles of Na2CO3, we would need 2 × 0.250 = 0.500 moles of HCl.

Convert moles of HCl to volume:

Given that the concentration of HCl is 2.00 M, we can use the formula:

Volume = Moles / Concentration

Volume of HCl = 0.500 moles / 2.00 M = 0.250 L

Convert the volume to liters:

The final answer is 0.250 liters of 2.00 M HCl are needed to react completely with 0.500 L of 0.500 M Na2CO3.

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The can be obtained by using the balanced chemical equation: Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2  Write the balanced chemical equation for the reaction.

Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2

Calculate the number of moles of Na2CO3. Using the formula n = c × V, where n is the number of moles, c is the concentration, and V is the volume, we get:

n = c × V

= 0.500 M × 0.500 L

= 0.250 mol

Calculate the number of moles of HCl required.The balanced chemical equation shows that 2 moles of HCl react with 1 mole of Na2CO3. Hence, the number of moles of HCl required can be calculated as follows

:n(HCl) = 2 × n(Na2CO3)

= 2 × 0.250 mol

= 0.500 mol

Calculate the volume of 2.00 M HCl required.The number of moles of HCl required is 0.500 mol. Using the formula V = n/c, where V is the volume, n is the number of moles, and c is the concentration, we get:

V = n/c

= 0.500 mol ÷ 2.00 M

= 0.250 L

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The direct path and direction from point A to B is called "Displacement". (Option D).

Displacement is described as a change in an object's location. It is a vector quantity with a magnitude and a direction. It is depicted as an arrow pointing from the starting point to the ending point.

For instance, if an object travels from A to B, the object's location changes. Displacement is the change in the location of an item.

The mathematical expression of displacement is given as:

Δx = xf  - x₀; Where

xf = Final Position

x₀ =  Initial position; and

Δx = displacement.

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LL Bean shifted from collecting structured data to unstructured data because the volume of data collected over time remained consistent.

Collecting structured data typically involves organizing and storing data in a predefined format, such as a data warehouse. However, LL Bean's decision to shift to unstructured data suggests that their existing data warehouse, which is likely designed for structured data, may not have been capable of efficiently handling the increasing volume of data collected over time.

Unstructured data, on the other hand, does not adhere to a specific format and can accommodate a larger and more diverse range of data types, allowing LL Bean to effectively manage the growing volume of data they were collecting.

Please note that the provided options A and B are not directly relevant to the reason stated for LL Bean's shift to unstructured data.

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As a result, the racer's final velocity is 13.00 m/s after accelerating at 0.500 m/s2 for 7.00 s.

Velocity is a vector representation of an object's or particle's displacement with respect to time. The meter per second (m/s) is the standard unit of velocity magnitude (also known as speed). Alternatively, velocity magnitude can be expressed in centimeters per second (cm/s). The direction of movement of the body or item is defined by velocity. Speed is fundamentally a scalar number. Velocity is, in essence, a vector quantity. It is the pace at which distance changes. It is the displacement rate of change.

Here,

The final velocity can be found using the equation of motion,

vf = vi + at,

where vf is the final velocity, vi is the initial velocity (11.5 m/s), a is the acceleration (0.500 m/s^2), and t is the time for which the acceleration was applied (7.00 s).

Substituting the values we get,

vf = 11.5 + 0.500 * 7.00 = 13.00 m/s.

So, the racer's final velocity is 13.00 m/s as he accelerates at the rate of 0.500 m/s2 for 7.00 s.

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Answer:

Things that are atomic in size.

Explanation:

Atomic force microscopes have advanced to the point that scientists can observe details resolved to a few picometers (or the size of atoms).

The observations that can be made with atomic force microscopes are the things that are atomic in size, therefore the correct answer is option A.

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.

A length, for instance, is a physical quantity. A defined, predetermined length is represented by the length unit known as the meter.

The atomic force microscope is used to observe things, that are very small and comparable to the atomic in size.

Thus, The observations that can be made with atomic force microscopes are that the things that are atomic in size, therefore the correct answer is option A.

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Answer:

Velocity = Displacement by time

Explanation:

Answer:

The formula to calculate velocity =distance(s) ÷ time taken(t)

Answer:

it's D

Explanation:

Newton's first law of motion states that a body at rest remains at rest or if in motion remains in motion at a constant velocity unless acted upon by a external Force

The correct option is D. In uniform motion will remain in motion unless it is acted upon by an outside force .

Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace. An object's acceleration is determined by its mass and the force being applied.

Every time one object applies force to another, the other object applies an equal and opposite force to the first.

According to Newton's first law, unless pushed to alter its condition by the operation of an external force, every object will continue to be at rest or in uniform motion in a straight line. Inertia is the propensity to resist changes in a condition of motion.

Therefore, The correct option is D. In uniform motion will remain in motion unless it is acted upon by an outside force .

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The switch that adjusts the magnetic field to be either nearly uniform or have a strong gradient will affect the current in the two coils differently.

When the magnetic field is nearly uniform at the center, the current in both coils will remain relatively unchanged. The uniform field will not induce any significant voltage in the coils, so the current will flow through them as usual.

However, when the magnetic field has a strong gradient, the current in the two coils will be affected differently. The rapidly changing field will induce a voltage in the coils according to Faraday's law of electromagnetic induction. This induced voltage will result in a change in the current flowing through the coils. The magnitude and direction of the induced current will depend on the specific characteristics of the coils and the magnetic field gradient.

In summary, the switch that changes the magnetic field from uniform to having a strong gradient will induce a change in the current flowing through the coils due to the induced voltage.

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A sequence diagram is a type of UML (Unified Modeling Language) diagram that shows the interactions between objects or components of a system as they occur in a chronological sequence.

It is a graphical representation of the interactions that take place between objects or components of a system, depicting the order of messages that are exchanged between them.

Sequence diagrams are used to visualize the flow of a system's functionality, as well as the communication and collaboration between the various components of the system. They are especially useful in understanding complex systems and identifying areas that may require improvement or optimization. Sequence diagrams are also often used to document and communicate the design of a system to stakeholders or development teams.

In summary, a sequence diagram shows the timing of interactions between objects or components of a system as they occur. It is a valuable tool in understanding and communicating the behavior and functionality of complex systems.

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Answer:

33 hours

Explanation:

7.5 + 6.5 = 13 + 1

14 + 10 = 24

9= 6+3

24 + 6 = 30

30+3= hours

Answer:

Explanation:

Remark

The only thing that might trip you up is what to do with the angle. The vertical component of the 15 degrees does no work against anything. So the 15 degrees limits the horizontal force.

The formula is

Work = F * d * cos(15)

The givens are

F = 2000 N

d = 30 m

Cos(15) = 0.9659

Solution

Work = 2000 * 30 * cos(15)

Work = 57,955

Rounded to two places would be 5.8 * 10^4

C

Answer:

C

Explanation:

first we convert km,m,cm into mm then compare them

The longest distance is 0.400 Km among all the given distances. Therefore, option (D) is correct.

The metric system can be defined as a system that is used for the measurement that uses the liter, meter, and gram as base units of length, capacity, and weight respectively.

In the metric system, the SI unit of length is represented as a meter which can be defined as the metric length that is traveled by light in a vacuum within 1⁄29979258 seconds.

Some of the other units of distance include Kilometres, Millimetres, nanometers, Centimetres, Meters, and Decimeters.

Conver all the given distance into meters:

A) 5000 cm = 5000 × 10⁻² m = 50 m

B) 30000 mm = 30000 × 10⁻³ m = 30 m

C) 500 m = 500 × 1 = 500 m

D) 0.400 Km = 0.4 × 10³ = 400 m

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Answer:

Velocity = 0.5 m/s South (A)

Explanation:

You need to determine the average rate of velocity.  

The equation you will use is velocity = displacement/time

The displacement is 30m South.

The time is 60 seconds.

Plug into the equation  Velocity = 30m South/60 s

Velocity = 0.5 m/s South

Answer: A)

Explanation:

The per unit inductance of the 400 induction motor can be calculated using the given information, such as the rated speed, nameplate values, and the no-load current.

To find the per unit inductance of the motor, we can use the following expression:

Xpu =\(\frac{(Vpu - (Rpu * Cos thetapu))}{lpu * sin theta pu}\)

Where:

Xpu is the per unit reactance

Vpu is the per unit voltage

Rpu is the per unit resistance

θpu is the per unit power factor angle

Ipu is the per unit current

Given that the motor operates at 50 Hz, we can calculate the rated synchronous speed (Ns) using the formula:

Ns = \(\frac{120 f}{P}\)

Where:

Ns is the synchronous speed in RPM

f is the frequency in Hz (50 Hz in this case)

P is the number of poles (4 poles in this case)

Substituting the given values, we get:

Ns = \(\frac{(120 *50)}{4}\) = 1500 RPM

Since the rated speed of the motor is 1485 RPM, we can calculate the slip (s) using the formula:

s = \(\frac{(Ns-Nr)}{Ns}\)

Where:

Nr is the rated speed (1485 RPM in this case)

Substituting the values, we get:

s = \(\frac{(1500-1485)}{1500}\) = 0.01

Now we can calculate the per unit reactance (Xpu):

Xpu = \(\frac{(Vpu - (Rpu * Cos thetapu))}{lpu * sin theta pu}\)

Given:

Rated power (PN) = 200 kW

Rated voltage (Vn) = Vpu × Vrated

Rated current (In) = Ipu × Irated

Rated power factor (cosN) = cosθpu

Rated speed (Nr) = 1485 RPM

Using the given values, we can calculate the rated voltage and current:

Vrated = √3 * Vn

Irated = √3 * In

Substituting the values, we get:

Vrated = √3 * Vpu * Vn

Irated = √3 * Ipu * In

Now we can calculate Xpu:

Xpu = \(\frac{(Vpu - (Rpu * Cos thetapu))}{lpu * sin theta pu}\)

Given that the rated speed (Nr) is the synchronous speed multiplied by (1 - s), we can calculate the synchronous speed (Ns) using the formula above and then calculate the slip (s).

After obtaining s, we can substitute the given values and calculate Xpu.

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The cut off frequency of the magnesium atom is obtained as 8.9 * x 10^18 Hz.

The cut off frequency is the lowest frequency of the incident ray at which photoelectric effect occurs.

Given that;

1 eV  gives 1.60 x 10-19 J

3.70 eV  gives 3.70 eV * 1.60 x 10-19 J/1 eV

= 5.92x 10^-19 J

Now;

Wo = hfo

fo = Wo/h

fo = 5.92x 10^-19 J/6.6 * 10^-34

fo = 8.9 * x 10^18 Hz

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When a student holds the other end of a string while holding a ball, the ball is swung in a horizontal circular pattern at a speed that is half that of the initial pace.

Tangential velocity is calculated by dividing the circle's circumference by the time needed for one full rotation, or 2*pi*r/t.

The rotating object's angular acceleration and angular velocity are related by the equation V = w * r, where w (omega) is the angular acceleration and r is the diameter of the circle.

A point with angular velocity possesses tangential velocity, which is its present speed. Imagine a tiny item that is attached to a string, and that it's revolving around a stationary point. The object's maximum distance is the length of the string, therefore if it moves continuously, its motion will be circular.

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Answer:

The volume of a given gas sample is directly proportional to it's absolute temperature at constant pressure. The volume of a given amount of gas is inversely proportional to its pressure when the temperature is held constant.

Explanation:

Answer:

3000g

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Answer:

Answer is the formation of multiple images of the same object .

Explanation:

I hope it's helpful!