Describe and explain the action of optical fibres
particularly in medicine and communications
technology

Answer:

by finding melting and boiling points

Explanation:

Answer:

Simple chemical tests can be used to identify the presence of various elements or classes of molecules (Tollen's test). ... Electron spin resonance (ESR): Also referred to as electron paramagnetic resonance (EPR), this method uses the spins of unpaired electrons in molecules to determine structure

Answer:

Foam

Explanation:

Took the test

The materials that are typically used as a thermal insulator are foam and ceramic.

The object that blocks the heat from transferring from one area to another is referred to as a thermal insulator.

Here,

The reduction of heat transfer (the movement of thermal energy between objects of different temperatures) between objects in thermal contact or within the impact of radiation is known as thermal insulation. In addition to using the right object forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.

The broad term for thermal preserving and heat insulating materials is thermal insulating materials, often known as materials or material complexes that appear to be resistant to thermal currents. Heat insulation prevents heat from leaving whereas thermal preservation stops heat from escaping or spreading.

Hence,

The materials that are typically used as a thermal insulator are foam and ceramic.

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Answer:

μ = .4842

Explanation:

Assuming constant acceleration and the object is sliding on a level surface:

Let's start off by finding the acceleration of the object.

v² = v₀² + 2aΔx

Now, we can make a free-body diagram and see that the only force opposing the object's motion is the friction force -- this is the only force in the x-direction.

We can use Newton's 2nd Law: F = ma to solve for the coefficient of friction.

F = ma

Now, we have:

The mass cancels out and solving for the coefficient of friction gives us:

We know the acceleration is -4.75 m/s² and g = -9.81 m/s²:

The coefficient of kinetic friction between the surfaces, assuming constant acceleration and a flat surface, is 0.4842.

Answer:

10 kg-m/s

Explanation:

It is given that,

Before the collision, each car (red+yellow) had a momentum of 5 kg.m/s.

After the collision, the yellow car now has a momentum of 0.

We need to find the momentum of the red car after the collision. The conservation of momentum will be applied in this problem. A/c to this law,

Momentum before collision = Momentum after collision

[tex]p_r+p_y=p'_r+p'_y[/tex]

[tex]5+5=0+p'_r\\\\p'_r=10\ kg-m/s[/tex]

Hence, the momentum of the red car after the collision is 10 kg-m/s.

Answer:

a= 9.81 s

Explanation:

vi= 8m/s

a= -9.81 m/s

d= 640m

t= 40s

1. Find final velocity

vf= vi +a(t)

vf= 8m/s + -9.81m/s x 40s

vf = -384.4 m/s

acceleration= change in velocity/ change in time

a= -384.4- 8= -392.4/ 40s = 9.81s

a= 9.81 m/s

Hopefully this helps and is correct! Much love ❤️

Answer:

Drawing Bohr Models

1. Draw the nucleus.

2. Write the number of Protons and  Neutrons in the nucleus

3. Draw the first shell

4. Add the electrons, the first shell  can only hold 2

5. Draw the next shell if you  have more electrons to add

6. Add your electrons, the 2nd  shell can hold up to 8

7. Check yours Valence  electrons

Explanation:

Answer:

it will sink because object that have less they float not more

Answer:

it will sink here's why

Explanation: The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.

Answer:

elastic potential energy

Explanation:

The situation above shows an example of an "elastic potential energy." This type of potential energy depends on the force being applied to the elastic object.

In the situation above, the elastic object is the rubber band. The resultant energy is then being stored until such time that this object will be freed. Once this happens, the elastic object will revert to its original form and the rock will soar (be released).

The amount of energy that is being stored largely depends on the distance of the "stretch" being applied to the object. It is said that the greater the force, the greater the stretch and the greater the distance covered by the rock (and vice-versa).

Answer:

When 1 Joule of work is done to move a charge of amount 1 Coulomb from one place to another, then it is said that the potential difference between the two points is 1 Volt (V)

Answer:

Mass of substance m = 0.050Kg

Initial Temperature T₁ = 20°C

Final Temperature T₂ = 100°C

we have to calculate the heat absórbed by the lead .

Since spècific heat of lead is not gíven so we will take spècific heat of lead 128 J/kg°C

[tex] \diamond \bf \: Q\: = m \times c( \Delta \: t) [/tex]Put the given value

[tex]\sf \longrightarrow \: Q = 0.050 \times 128 \times (100 - 20) \\ \\ \\ \sf \longrightarrow \: Q = 0.050 \times 128 \times (80) \\ \\ \\ \sf \longrightarrow \: Q = 6.4 \times 80 \\ \\ \\ \sf \longrightarrow \: Q = 512 \: joules[/tex]

Therefore,

Answer: A reference frame is simply a perspective, context, or point of view. In physics that typically means physical space time coordinates, in the social sciences it takes on a slightly different meaning. In both fields, everything is relative to the point of view of the observer ( relativity ).

Explanation:

Answer:

In physics, a frame of reference consists of an abstract coordinate system and the set of physical reference points that uniquely fix the coordinate system and standardize measurements within that frame. For n dimensions, n + 1 reference points are sufficient to fully define a reference frame.

Explanation:

Also called reference frame. Physics. a framework that is used for the observation and mathematical description of physical phenomena and the formulation of physical laws, usually consisting of an observer, a coordinate system, and a clock or clocks assigning times at positions with respect to the coordinate system.

Reference frame, also called frame of reference, in dynamics, system of graduated lines symbolically attached to a body that serve to describe the position of points relative to the body.

Choosing a frame of reference requires deciding where the object's initial position is and which direction will be considered positive. ... Frames of reference are particularly important when describing an object's displacement. Displacement is the change in position of an object relative to its reference frame.

Actually, frames of references are classified into two types depending upon how they are moving. Those two types are called inertial and non-inertial frames of reference. An inertial frame of reference has no acceleration. The law of inertial holds in such a frame; no fictitious forces arise.

Explanation:

velocity = frequency × wave length

33 = 22 × wave length

wave length = 33 ÷ 22 = 1.5 m

this is the correct answer Step-by-step

I hope you understand...

can you please mark my answer

Answer:

C

Explanation:

EDGE22

Answer:

It would move forward.

Explanation:

Answer:

21.76J

Explanation:

F=ma

where:

m=mass

a=acceleration

Kamaria's mother should pull her with a force of  21.76 Newton if she (Kamaria) wants her acceleration to be 0.80 m/s².

In order to accelerate a body of mass 'm kg' with an acceleration of 'a m/s²', a force of magnitude equal to the product of mass and required acceleration is required. Mathematically -

F = m x a

Given is a girl learning how to ice skate. She wants to move with an acceleration of 0.80 m/s² and her mass is 27.2 kg.

From the definition of force, we can write -

F = m x a

F = 27.2 x 0.8

F = 21.76 Newton

Therefore, Kamaria's mother should pull her with a force of  21.76 Newton if she (Kamaria) wants her acceleration to be 0.80 m/s²

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Explanation:

The current which flows through the circuit is dependent on the resistance of the material/device. Given by the equation U=RI

If U becomes 2U

And I becomes 3 I

then R×2=3

R=3/2=1.5 Ω

Hope this answers your question?

Answer:

Explanation:

Let's go through each one.

short-wavelength - not all of them got short wavelengths.

stream of photons - yup, they all got a stream of photons, but the longer wavelengths' photons don't carry much energy such as the shorter wavelengths.

energy in atoms - yes, all wavelengths have energy, the short wavelengths carry more energy than the longer ones.

only from radioactive material - not at all. Radio waves and microwaves are not radioactive! only the wavelengths that carry a large amount of energy are radioactive - these are the shorter wavelengths - these might be gamma rays and x-rays.

speed of 300,000 kilometers per second - yes! all electromagnetic radiation travels at this speed! isn't it amazing?

travel through vacuum of space - yup, all of them.

Hope this helps!

Explanation:

K.E = 5,000,000 KJ

MASS = 100,000,000 Kg

K.E = 1/2 MV^2

[tex]5000000 = \frac{1}{2} \times 100000000 \times v {}^{2} [/tex]

[tex]5000000 = 50000000 \times v {}^{2} [/tex]

[tex]v {}^{2} = \frac{5000000}{50000000} [/tex]

[tex]v {}^{2} = \frac{5}{50} [/tex]

therefore

[tex]v {}^{2} = \frac{1}{10} [/tex]

[tex]v = \sqrt{0.1} [/tex]

v = 0.316 m/s^2

The velocity of the cruise ship whose mass is 10⁸ Kg moving with Kinetic energy of 5 x 10⁹J is 10 m/s

The Kinetic energy of the body is the energy possessed by body by virtue of its motion.

Given is a cruise ship that has a mass of 100,000,000 kg and has a kinetic energy of 5,000,000 kJ. From this, we can write -

Mass [M] = 10⁸ Kg

Energy [E] = 5 x 10⁶ KJ = 5 x 10⁹ J

The formula to calculate the Kinetic energy of the body is -

E [K] = E = 1/2 mv²

v² = 2E/m

v² = (2 x 5 x 10⁹)/10⁸

v² = 100

v = √100

v = 10 m/s

Therefore, the velocity of the cruise ship whose mass is 10⁸ Kg moving with Kinetic energy of 5 x 10⁹J is 10 m/s

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Answer:

x = 333.33 [m]

Explanation:

To solve this problem we must use the following kinematics equation.

[tex]v_{f}^{2} = v_{i}^{2}-(2*a*x)[/tex]

where:

Vf = final velocity = 0

Vi = initial velocity = 20 [m/s]

a = desacceleration = 0.6 [m/s^2]

x = distance [m]

Note: the final speed is zero as the body finishes its movement.

Now replacing:

0 = (20)^2 - (2*0.6*x)

1.2*x = 400

x = 333.33 [m]

[tex]\Large \boxed{\displaystyle density \ (kgm^{-3})=\frac{mass\ (kg)}{volume \ (m^3)} }[/tex]

Explanation:

Weight = Fg = mg = (60 kg)*(9.8 m/s2) = 588 N.

Answer:

D: A kitten gains weight.

Explanation:

Answer:

Explanation:

In order to find the distance covered we use the formula

From the question

velocity = 0.24 m/s

time = 5 s

We have

distance = 0.24 × 5

We have the final answer as

Hope this helps you

Answer: B

Explanation:

The conservation of momentum states that the initial momentum of the system must equal the final momentum of the system. Our system in this case is the two colliding objects and ONLY the two colliding objects. Initially, our system had mass 1 moving towards a stationary mass 2. The stationary mass has a velocity of 0m/s and therefore has no momentum. The initial momentum would then be:

[tex]p_i=m_1v_1_i+m_2v_2_i[/tex]

[tex]p_i=m_1v_1_i[/tex]

The final momentum depends on what type of collision occurred. This case is the simplest type of collision, when the objects stick to each other and act as one. Since the objects move together, their velocity must be the exact same. Our final momentum looks like:

[tex]p_f=m_1v_f+m_2v_f[/tex]

[tex]p_f=v_f(m_1+m_2)[/tex]

Setting the initial momentum equal to the final momentum:

[tex]p_i=p_f[/tex]

[tex]m_1v_1_i=v_f(m_1+m_2)[/tex]

Solving the final velocity:

[tex]v_f=m_1v_1_i/(m_1+m_2)[/tex]

Which matches answer B

Answer:

The velocity of the frozen rock at [tex]t = 1.5\,s[/tex] is -14.711 meters per second.

Explanation:

The frozen rock experiments a free fall, which is a type of uniform accelerated motion due to gravity and air viscosity and earth's rotation effect are neglected. In this case, we need to find the final velocity ([tex]v[/tex]), measured in meters per second, of the frozen rock at given instant and whose kinematic formula is:

[tex]v = v_{o} + g\cdot t[/tex] (Eq. 1)

Where:

[tex]v_{o}[/tex] - Initial velocity, measured in meters per second.

[tex]g[/tex] - Gravity acceleration, measured in meters per square second.

[tex]t[/tex] - Time, measured in seconds.

If we get that [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]g = -9.807\,\frac{m}{s^{2}}[/tex] and [tex]1.5\,s[/tex], then final velocity is:

[tex]v = 0\,\frac{m}{s}+\left(-9.807\,\frac{m}{s^{2}} \right) \cdot (1.5\,s)[/tex]

[tex]v = -14.711\,\frac{m}{s}[/tex]

The velocity of the frozen rock at [tex]t = 1.5\,s[/tex] is -14.711 meters per second.

Answer:

Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]

Explanation:

Acceleration is a quantity that indicates how the speed of the object changes over time. In other words, acceleration is a vector quantity that relates changes in velocity to the time it takes to occur. It is normally represented by the letter a and its unit of measurement, in the International System it is meters per second squared [tex]\frac{m}{s^{2} }[/tex].

The mathematical expression for the acceleration is:

[tex]a=\frac{final speed - initial speed}{final instant - initial instant}[/tex]

In this case:

Replacing:

[tex]a=\frac{0 \frac{m}{s} - 2.8\frac{m}{s} }{0.15 s - 0s}[/tex]

a= -18. 667 [tex]\frac{m}{s^{2} }[/tex] ≅ -19 [tex]\frac{m}{s^{2} }[/tex]

Deceleration is a quantity that expresses the passage of a moving body from one speed to a lower speed. Mathematically it is calculated as the acceleration but the result will be a negative acceleration.

Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]

Answer:

a,this help to know the

period in which an element belong to,which also talks about the oxidation number or state of this uncombined element

Answer:

Use the method on the image and solve it.

The train is accelerating with an initial velocity of 23 m/s, a final velocity of 190 m/s in the time period of 54 seconds, then the acceleration will be 3.09 m/s².

Velocity is the measurement of a particle's or object's displacement with relation to time. The recognized unit of magnitude for velocity is the meter per second (m/s) (also known as speed).

There are several ways to show a velocity vector's direction, depending on how many dimensions are provided.

The given values in the question are,

Initial velocity, u = 23 m/s

Final velocity, v = 190 m/s and,

Time, t =54 seconds.

By putting the formula of the equation of motion :

v = u + at

190 = 23 + (a)(54)

a = 167/54

a = 3.09 m/s².

Hence, the acceleration of the train is equal to 3.09 m/s².

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