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During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other thanredis mostly scattered away. Most of theredlight, which is the least scattered, enters our eyes. Hence, thesunand the skyappear red.

Given:

vi = 0 m/s

d = -1.40 m

a = -1.67 m/s2

Find:

t = ??d = vi*t + 0.5*a*t2-1.40 m = (0 m/s)*(t)+ 0.5*(-1.67 m/s2)*(t)2

-1.40 m = 0+ (-0.835 m/s2)*(t)2

(-1.40 m)/(-0.835 m/s2) = t2

1.68 s2 = t2

t = 1.29 s

For instance, the Moon is located r = 384,000 km from Earth and it has a radius of d = 1,738 km, so its angular radius is 1,738/384,000 = 0.0045 radians. Since 1 radian = 57.3 degrees, the angular radius of the Moon is 0.0045 x 57.3 = 0.26 degrees, so its diameter is 0.52 degrees as viewed from Earth.

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•the programs and other operating information used by a computer.

60

Refraction is what occurs when a light (such as an electromagnetic light wave) enters a new medium (type of matter- such as solid, liquid, or gas) that causes its speed to change. For example, when light passes from a fast medium (gas) to a slower medium (such as a liquid), then the light ray will bend toward the normal to the boundary between the two medium.

Refraction is what accounts for the "bending of a straw" when it is placed in a cup of water. It is also what causes a spear-fisherman to have difficulty in pinpointing the exact location of the fish that he/she intends to spear. Finally, a prism works based on the principles of refraction. Long wavelengths (red) refract less than short (blue or violet), so the colors of visible light separate.

the bending of light when traveling from one medium to another medium is known as refraction.

the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.

measurement of the focusing characteristics of an eye or eyes.

This is due to the refraction phenomenon of light . After reflecting from the bottom surface ofpoollight rays (some) remain inside the water, thus giving an apparent height to the observer watching from above .

Effects of Force. A force acting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. When there's the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction.

Force can be defined as a push or a pull that changes or tends to change the state of rest or uniform motion of an object or changes the direction or shape of an object. It causes objects to accelerate or add to their overall pressure.

The answer will beθ=0°

It is because, the angle of incidence is the angle between the normal and the angle at which the light/sound wave is incident on the surface. So, as the question says that the sound wave is incident perpendicularly on the reflecting surface then there the angle of incidence will be zero degree.

The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets. These wavelets spread out in the forwarddirection, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets.

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According to Huygens's Principle every point on a propagating wavefront serves as the source of spherical secondary wavelets, such that the wavefront at some later time is the envelope of these wavelets. If the propagating wave has a frequency, f, and is transmitted through the medium at a speed, v, then the secondary wavelets will have the same frequency and speed.

This principle is quite useful, for from it can be derived the laws of reflection and refraction

The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets

Huygen's Principle:

Construction of Spherical Wavefront

COnstruction of Plane wavefront

That is this

Definition of spread - open out (something) so as to extend its surface area, width, or length, extend over a large or increasing area, apply (a substanc.

Wavefront is the locus of points characterized by propagation of positions of identical phase: propagation of a point in 1D, a curve in 2D or a surface in 3D.

Wave front is defined as locus of all points having same phase at a given instant of time.

The shape of wavefront depends on the shape of the source of disturbance.

A wavefront is always normal to the light rays.

A wavefront does not propagate in the backward direction.

a wavefront is the locus of points characterized by propagation of positions of identical phase: propagation of a point in 1D, a curve in 2D or a surface in 3D. For an electromagnetic wave, the wavefront is represented as a surface of identical phase, and can be modified with conventional optics

Thesepointsare then said to be inphase. ... The wavelength of a wave is the distance between any two adjacentpointsthat are inphase.Pointsthat are not inphase, those that are not separated by a complete number of wavelengths, are called out ofphase.

Thedimensionof power isenergydivided by time. The SI unit of power is the watt (W), which is equal to one joule per second.

M2L2T-2 is the correct answer for this question

teri ma sklssmsdddkdkmds

sddmaderchod

dimensions of energy = [ML^2T^-2]

the dimension of power is energy divide by time is called dimension of power its si unit is watt (W)

The dimension of energy is energy divided by the time.

The dimension of energy is energy divided by the time .

[ML^2T^-2] is dimension of energy.

QuantityDimensionRoot definition and NotesEnergy| Lagrangian | Hamiltoniankg.m2.s-2joule. [Force]*[Distance], [Power]*[Time]Specificenergym2.s-2[Energy]/[Mass]Energydensitykg.m-1.s-2[Energy]/[Volume]Power |Energyfluxkg.m2.s-3watt. [ΔEnergy]/[ΔTime]

Deaminationis the removal of anamino groupfrom amolecule.[1]Enzymesthatcatalysethis reaction are calleddeaminases.

In thehuman body, deamination takes place primarily in theliver, howeverglutamateis also deaminated in thekidneys. In situations of excess protein intake, deamination is used to break downamino acidsfor energy. The amine group is removed from the amino acid and converted toammonia. The rest of the amino acid is made up of mostlycarbonandhydrogen, and is recycled or oxidized for energy. Ammonia is toxic to the human system, andenzymesconvert it toureaoruric acidby addition ofcarbon dioxidemolecules (which is not considered a deamination process) in theurea cycle, which also takes place in the liver. Urea and uric acid can safely diffuse into the blood and then be excreted in urine.

Thedimensionof power isenergydivided by time. The SI unit of power is the watt (W), which is equal to one joule per second.

In SI base units:kg⋅m2⋅s−3

SI unit:watt

Derivations from other quantities:P = E/t; P = F·v; P = V·I; P = T·ω

Dimension Energy Services is an industry leader in pipeline and facilities construction and maintenance. We have a strong track record of executing and building high-quality projects to help our customers meet their oil & gas pipeline and facilities project objectives

it is correct answer

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The process of splitting avectorinto various parts or components is called "RESOLUTION OF VECTOR" These parts of avectormay act in different directions and are called "components ofvector".

everydaydefinition meanseffort be excerted.scientific definitionrequires that force act on object and object moves in that direction. example of when is force applied but noworkdone. a roofer carries a bundle of shingles across the roof.

Work in physics is defined as some variation of F * d, where F is the force applied to an object and d is the distance that force moves it. (This definition doesn't always make sense in all situations, like expansion of gasses and such, but the alternate definitions say basically the same thing.)

Now imagine pushing against a wall for a couple of minutes. Your body will certainly feel like you've done some work--your muscles might start to hurt, you might get tired, and so on. But according to F * d, you haven't done any work since the wall didn't actually move when you tried to push it.

Here's another: d is actually just the object's final distance from its original position, so if you pick up a heavy book, throw it in the air a couple times, and put it back exactly where you found it, the amount of work you will have done is zero even though you spent some energy doing it.

Those are the two standard examples. I should mention that biologists define work differently than physicists--they don't ignore the processes happening in your muscles while you do these things, so it's not like you're actually getting free energy or making energy disappear. They're just questions of definition.

Wave front, imaginary surface representing corresponding points of awavethat vibrate in unison. When identical waves having a common origin travel through ahomogeneousmedium, the corresponding crests and troughs at any instant are in phase;i.e.,they have completed identical fractions of their cyclic motion, and any surface drawn through all the points of the samephasewillconstitutea wave front.TheFigureshows a spherical wave front (ws) for asoundwave spreading out from a point source and a plane wave front (wp) for a parallel beam of light, such as that emitted from a laser. Wave fronts for longitudinal and transverse waves may be surfaces of any configuration depending on the source, the medium, and the obstructions encountered.See alsoHuygens’ principle.

The Scope of PhysicsPhysics is the study of energy, matter, and their interactions. It’s a very broad field because it is concerned with matter and energy at all levels—from the most fundamental particles of matter to the entire universe. Some people would even argue that physics is the study of everything! Important concepts in physics include motion, forces such as magnetism and gravity, and forms of energy such as light, sound, and electrical energy.

Physics help us in a number of ways and affects daily life at aspects. The scope of Physics is quite vast as it deals with different circumstances under different quantitative and qualitative experimental conditions. The scope of physics can be understood under the two disciplines;microscopic(deals with physical world of atoms and molecules) andmacroscopic(deals with physical world of large bodies)

MicroscopicMacroscopic

Microscopic

Themicroscopicdomain includes the study and understanding of atoms, molecules, nucleus and other tiny particles. The microscopic domain forms the foundation forModern Physics. To know about the scope of Physics at the microscopic level, let’s understand what Modern Physics is:

Modern Physics

Modern Physics is a subdivision of Physics which covers the understanding of energy and matter at the microscopic level.MatterandEnergyare not considered separate in modern physics but alternate forms of each other i.e. they are interconvertible. Modern Physics is studied under two sections.

Quantum MechanicsTheory of Relativity

Quantum Mechanics

The branch of science which deals with motion and interaction of subatomic particles. Quantum Mechanics help us to understand how the universe operates at the atomic level. Several important concepts like quantization of charge, wave-particle duality, the uncertainty principle are covered inQuantum Mechanics.

Theory of Relativity

The theory of Relativity is proposed by Einstein. This theory helps us in understanding inertial (non-accelerated) and non-inertial (accelerated) frames of reference and how it affects subatomic particles.Theory of Relativityis the reason behind whySir Albert Einsteinis known asFather of Modern Physics.

Macroscopic

The macroscopic domain of physics includes the study and understanding of finite size objects and terrestrial bodies. We study the macroscopic domain of Physics in Classical Physics.

Classical Physics

Classical Physics deals with macroscopic bodies at terrestrial and astronomical level. It helps in understanding the interaction between two bodies, the force they apply to each other and what they are made of. Classical Physics is again subdivided into following disciplines.

MechanicsThermodynamicsElectrodynamicsOptics

Mechanics

Mechanics deals with the motion and general systems of particles, deformable bodies, rigid bodies and flow of liquids. In mechanics, we study the position and energy of the object. Newton Laws of Motion frames the basic of Mechanics where we get to know about how bodies and forces are interlinked, and how we can modify them to get desired inventions.

Mechanics covers following concepts:

Rocket propulsion with the help of ejecting gasesPropagation of water waves or sound waves in airEquilibrium between bodies under different experimental conditions

Thermodynamics

Thermodynamics deals with the relation between heat and conversion of heat into different types of energy (mechanical, electrical or chemical energy). You will get to know how engines work, what efficiency is and how Thermodynamics affects our life at various levels.

In thermodynamics, we study about

Efficiency of heat engines and refrigeratorsThe direction of a physical or chemical processHow body behaves differently at different temperatures and surroundingsChanges in internal energy and entropy, through supply of external heat and work are done on the system

Electrodynamics

Electrodynamics is a branch of science which deals with the interaction of charged bodies with magnetic and electric fields. It's basic laws are proposed by Coulomb and Oersted and are of great interests in thermodynamics.

Some interesting applications in electrodynamics are

The motion of current carrying conductor in electric and magnetic fieldDifferent types of voltage supply i.e. DC and AC and how we can interconvert them to save electricityThe working of antenna and transmission of signalsThe flow of radio waves in ionosphere

Optics

Optics is a branch of science which deals with light and its basic characteristics; reflection and refraction. Optics helps in analyzing the formation of images from distant objects by different types of mirrors and lens. Many flabbergasting phenomena like the twinkling of stars, a scattering of light, the formation of rainbow and time of sunset and sunrise are explained in Optics.

We learn in optics about

The working of telescopes and microscopesImage formation in different types of lensColour exhibited by thin films

Experiments and Researches

Experiments and Researches frame the achievements and contributions of physics in our life. Some achievements and researches occurred in physics so far are

Tread Walkis a mobility device for the elders and disabled ones.A lithium paper battery isan invention by Stanford researchers.Virtual Garageis designed by Jaguar Land Rover which helps in modifying cars in a virtual mannerVisually Impaired Assistantinvented by Noam Klopper helps the blind to skip obstacles on the road and provides directions via GPS technology

Conclusion

Overall glimpse of Physics is beautiful and becomes more appreciable as we learn more about the subject. The scope of physics is quite vast and covers an enormous range of magnitude of physical quantities like mass, length, time, energy etc. The scope is divided into two sections, where on one side it studies about phenomena at a very small microscopic level involving and analyzing electrons, protons, and neutrons. At the other side, we try to study bodies of huge size orders.

Physics is exciting in a number of ways. The scope of physics express itself in some beneficial ways are:

Few concepts and laws can explicate many natural phenomena covering large order of quantitiesNew experiments help in unlocking secrets of nature and form new laws to explain complex theoriesApplication and modification of laws help in inventing good devices to ease human comfort.

option 3 is incorrect... minimum number of vectors are actually 2 only..

example... 2i and -2i.

sum of resultant is 2i+(-2i) = 0

(a) total energy stored in car = 10*2KWH = 20KWH

Car takes 2 KW for 20km/h.

So, t = 20KWH/ 2KW = 10 Hours

(b) Total distance covered = v *t = 20*10 = 200 km.

10 ohm will be cancel due to whetstone brig as2÷4=4÷81/2=1/2 then 2 and 4 =6

4 and 8=12

6 and 12 are in parallel series1/R=1/6+1/121/R=(2+1)/12R=12/3=4 ohm

and what about 384?. where it is

Ur given answer is wrong

As we know that a projectile motion is a combination to horizontal and verticle motion.The vetical component of intial velocity ‘u’ always remains constant ,i.e. in this case ,ux=ucoso,throughout the motion.So change in momentum in horizonal direction is 0(zero).

Now analysing the vertical direction motion we know intial velocity in vertical direction uy=usino.

After time t,vy=usino-gt,(using eq. of motion ,v=u+at)

Thus, Change in momentum in vertical direction =m.vy-m.uy

=m.(usino-gt)-(m.usino)

=-mgt

cosine rule→

R=magnitude of resultant of u and v , inclined at an angle α to vector u,

R²=u²+v²-2uvcos(180°-θ)

R=√{u²+v²+2uvcosθ}

sinα=usinθ/R

Ans :- Option (b) is correct.

In both aldehydes and ketones, the geometry around thecarbonatom in the carbonylgroupis trigonal planar; the carbonatom exhibits sp2hybridization. Two of the sp2 orbitals on thecarbonatom in the carbonylgroupare used to form σ bonds to the othercarbonor hydrogen atoms in a molecule.

h1 = +1.2 cmf = +12 cmu = -8 cm

Using mirror formula ;

(1/f) = (1/v) + (1/u)

(1/12) = (1/v) + (1/-8)

1/v = (1/12) + (1/8)

1/v = (2+3)/24

v = 24/5

v = +4.8 cm======================

m = h2/h1 = -v/u

h2 = (-4.8/-8) × 1.2

h2 = + 0.72 cm___________________Hence the image formed is Virtual and erect of size 0.72 cm and at a distance of 4.8 cm from the mirror.

Given that focal length, f= -10cm

Magnification, m= Image height/ Object height= 6/2 = 3

Also magnification= - v/u

3= -v/u

v= -3u

As 1/u + 1/v = 1/f

1/u + 1/-3u = 1/ -10

Therefore u= -6.667

So object should be placed at a distance of 6.667 cm in front of the mirror.

answer no d is correct