Explore topic-wise InterviewSolutions in Current Affairs.

ANSWER:

PERIODIC motion is possessed by the person because he is doing same thing in a equal PERIOD of TIME

Answer:

10m/35min

Explanation:

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ANSWER :

Displacement REACTION :

The reaction in which the more Reactive element displace less reactive element from its ion .

For EXAMPLE :

Zn + CUSO4 =======> ZnSO4+Cu

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YES, when a comb is rubbed with DRY hair it ATTRACTS LEAVES

HEY mate!

HOPE Ur fine

in fluid dynamics, Bernoulli's principal states that an increase in the speed of fluid occurs simultaneously with a decrease in pressure or a decrease in a fluids potential ENERGY. the principal named after Danial Bernoulli's who published in his book hydrodynamica in 1738.

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Explanation:

NEWTON's second law of motion is also KNOWN as the law of force and ACCELERATION

according to this law

force is directly proportional to the acceleration produced in the same DIRECTION as the NET force is

i.e F = m a

What do you MEAN by DISPLACEMENT reaction?

=> A reaction in which a more reactive ELEMENT displaces a less reactive element from its compound.

Ex:- Reaction of iron nails with copper sulphate SOLUTION.

Answer:A force acting on an object may cause the object to CHANGE shape, to START moving, to stop moving, to accelerate or DECELERATE. When two objects INTERACT with each other they exert a force on each other, the forces are equal in size but opposite in direction

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Explanation:

ANSWER:

GRAVITY by BALRAM SIR in chomu

FORCE is the RATE of CHANGE in MOMENTUM

ANSWER:

I can 't UNDERSTAND what is

ANSWER:

I am in 6TH CLASS I don't KNOW what is the answer

ANSWER:

dear

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ANSWER:

Explanation:

2. Orbital angular momentum

Consider a particle of mass m, momentum ~p and position vector ~r (with respect to a

fixed origin, ~r = 0). In classical mechanics, the particle’s orbital angular momentum is given

by a vector L~ , defined by

L~ = ~r × ~p. (1)

This vector points in a direction that is perpendicular to the plane CONTAINING ~r and ~p,

and has a magnitude L = rp sin α, where α is the angle between ~r and ~p. In Cartesian

coordinates, the components of L~ are

Lx = ypz − zpy;

Ly = zpx − xpz;

Lz = xpy − ypx.

(2)

The corresponding QM operators representing Lx, Ly and Lz are obtained by replacing

x, y, z and px, py and pz with the corresponding QM operators, giving

Lx = −i~

y

∂

∂z − z

∂

∂y

;

Ly = −i~

z

∂

∂x − x

∂

∂z

;

Lz = −i~

x

∂

∂y − y

∂

∂x

.

(3)

In a more compact form, this can be written as a vector operator,

L~ = −i~(~r × ∇~ ). (4)

It is easy to verify that L~ is Hermitian.

Using the commutation relations derived for ~x and ~p, the commutation relations between

the different components of L~ are readily derived. For example:

[Lx, Ly] = [(ypz − zpy),(zpx − xpz)] = [ypz, zpx] + [zpy, xpz] − [ypz, xpz] − [zpy, zpx] (5

– 3 –

Since y and px commute with each other and with z and pz, the first term reads

[ypz, zpx] = ypzzpx − zpxypz = ypx[pz, z] = −i~ypx (6)

Similarly, the second commutator gives

[zpy, xpz] = zpyxpz − xpzzpy = xpy[z, pz] = i~xpy (7)

The third and forth commutators vanish; we thus find that

[Lx, Ly] = i~(xpy − ypx) = i~Lz. (8)

In a similar way, it is straightforward to show that

[Ly, Lz] = i~Lx (9)

and

[Lz, Lx] = i~Ly (10)

The three equations are equivalent to the vectorial commutation relation:

L~ × L~ = i~L. ~ (11)

Note that this can only be TRUE for operators; since, for REGULAR vectors, clearly L~ × L~ = 0.

The fact that the operators representing the different components of the angular momentum do not commute, implies that it is impossible to obtain definite values for all component

of the angular momentum when measured simultaneously. This means that if the system

is in eigenstate of one component of the angular momentum, it will in general not be an

eigenstate of either of the other two components.

We define the operator representing the square of the magnitude of the orbital angular

momentum by

L~ 2 = L

2

x + L

2

y + L

2

z

. (12)

It is easy to show that L~ 2 does commute with each of the three components: Lx, Ly or Lz.

For example (using [L

2

x

, Lx] = 0):

[L~ 2

, Lx] = [L

2

y + L

2

z

, Lx] = [L

2

y

, Lx] + [L

2

z

, Lx]

= Ly[Ly, Lx] + [Ly, Lx]Ly + Lz[Lz, Lx] + [Lz, Lx]Lz

= −i~(LyLz + LzLy) + i~(LzLy + LyLz) = 0.

(13)

Similarly,

[L~ 2

, Ly] = [L~ 2

, Lz] = 0, (14)

– 4 –

which can be summarized as

[L~ 2

, L~ ] = 0. (15)

Physically, this means that one can find simultaneous eigenfunctions of L~ 2 and one of the

components of L~ , implying that both the magnitude of the angular momentum and one of

its components can be precisely determined. Once these are known, they fully specify the

angular momentum.

In order to obtain the eigenvalues of L~ 2 and one of the components of L~ (typically, Lz),

it is convenient to express the angular momentum operators in spherical polar coordinates:

r, θ, φ, rather than the Cartesian coordinates x, y, z. The spherical coordinates are related

to the Cartesian ones via

x = r sin θ cos φ;

y = r sin θ sin φ;

z = r cos θ.

(16)

After some algebra, one gets:

Lx = −i~

− sin φ

∂

∂θ − cot θ cos φ

∂

∂φ

Ly = −i~

cos φ

∂

∂θ − cot θ sin φ

∂

∂φ

Lz = −i~

∂

∂φ;

L~ 2 = −~

2

h

1

sin θ

∂

∂θ

sin θ

∂

∂θ

+

1

sin2 θ

∂

2

∂φ2

i

.

(17)

We thus find that the operators Lx, Ly, Lz and L~ 2 depend on θ and φ only, that is they

are independent on the radial coordinate ~r. All these operators therefore commute with any

function of r,

[Lx, f(r)] = [Ly, f(r)] = [Lz, f(r)] = [L

2

, f(r)] = 0. (18)

Also, obviously, if a wavefunction depends only on r (but not on θ, φ) it can be simultaneously

an eigenfunction of Lx, Ly, Lz and L

2

. In all cases, the corresponding eigenvalue will be

0. (This is the only exception to the rule that that eigenvalues of one component (e.g., Lx)

cannot be simultaneously eigenfunctions of the two other components of L).

ANSWER:

(C). -- 600 j

Explanation:

as VOLUME DECREASES

ANSWER :

Firstly To know the CONCEPT of Focal length u should know about Pole and focus of mirror .

Principal Focus :

Focus is a point on principal axis on which the ray of light coming parallel to principal axis intersect After refection.

It is DENOTED by F

Pole :

Pole is the centre of the mirror .

Now come to your question

What is focal length ??

Here is Answer :

DISTANCE between pole to principal focus is known as Focal length (f).

Focal length is half of Radius of curvature.

Focal length = Radius /2

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HOLA MATE

ANSWER:

⭕microampere

⭕1 microampere=10^-6 ampere

S.I unit of current is ampere DENOTED by A

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Answer:

hii dear

Explanation:

An OBJECT UNDERGOING a constant acc. has a CONSTANTLY changing VELOCITY.lf the acc. always point in the same direction as the velocity the trajectory will be no diffrent then if their was no acc. but the generally acc. change the trajectory.

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what is this MEANS I don't KNOW????

ANSWER:

24 he's is the answer OK

Explanation:

here's ur ANSWER dear.

⏭️the principal focus of a mirror is a point on the principal axis of the mirror at which , the light rays which are PARALLEL to the principal axis ACTUALLY converge for appeared to diverge after REFLECTION.

Answer:

here is your answer mate

Explanation:

when the object is placed between the mirror and the focal POINT it can magnified and FORMED ERRECT IMAGE

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Answer:

gold ,silver,COPPER, tin,LEAD,iron and Mercury

Explanation:

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Answer:

8 TIMES the PREVIOUS FORCE

Answer:

PHYSICAL STRENGTH or power is CALLED FORCE

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Force Definition. In SCIENCE, force is the PUSH or pull on an object with mass that causes it to change VELOCITY (to accelerate). Force represents as a vector, which means it has both MAGNITUDE and direction..

Answer:

2/3

Explanation:

from SNELL's law,

REFRACTIVE INDEX if GLASS w.r.t AIR is the reciprocal of the refractive index of air w.r.t. glass

Answer:

HYDROSTATIC DEFINITIONS are the properties of FLUID PRESSURE

ANSWER:

.....................

Answer:

u NEED to give some more data LIKE TIME and final VELOCITY else it's not possible

ANSWER:

That's is very GOOD FORCES

ANSWER:

it MEANS that the OBJECT is REMAINS in REST.

When a number of resistors are CONNECTED in series the equivalent resistance will be the sum of INDIVIDUAL RESISTANCES LIKE,

Re=R1+R2+R3....+Rn

When resistors are connected in PARALLEL the sum of all the resistances will be less than the individual resistance

1/Re=1/R1+1/R2+1/R3....+1/Rn

The FORCE that stops CYCLIST from SKIDDING is called Frictional force.

It is the force which OPPOSES motion.

Cheers!

Answer:

in uniform magenatic FIELD acceleration is CONSTANT.

but velocity changes at every instant because particle is accelarting.

so

p=mv

and V is changing

so,

momentum, p also changed.

i hope my answer MAY HELP u.

The SECOND PENCIL is the BIGGER one.

This is because 50mm=5cm

The gravitational force between two objects is 6.47 × 10-¹¹N. You can easily see that this force is so small that it cannot EVEN pull a PIECE of COTTON or a SIMPLE particle. So, this is why we are not getting pulled by the building. This explains EVERYTHING, why all the objects around us, even the slightest objects , are not pulled towards us or why we are not getting pulled towards them.

Cheers!

Answer:

200m

Explanation:

athlete COMPLETES one round in 40sec.

So, in 2 mins 20 SECS = 140 secs ,

it will complete 3 and a HALF round.

Now ,it will be on opposite of the starting point ,thus, displacement = diameter of CIRCLE, i.e., 200m.

Answer:

Any SURFACE over which the POTENTIAL is CONSTANT is CALLED an EQUIPOTENTIAL surface.

ANSWER:

My answer to MATE MARK as BRAINLIST

Answer:

The liquid at the bottom of the CONTAINER exerts some pressure which depends upon the HEIGHT of water filled in the container ..

The gases too exert pressure on the wall of the container contaning them . A gas consists of MOLECULES and every molecule has some KINETIC energy .

Explanation:

Hey mate HOPE u understand !!

❤❤

Answer:

10mm the 5CM then 1KM

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I don't KNOW the ANSWER

the simple reason for this common confusion is that this force is one of the weakest force in nature. THATS why we never see people buildings and evrythng GETTING PULLED TOWARDS each other.

Answer:

Distance= 220 km

Time= 3 hrs

Average SPEED= Distance/Time

= 220 km/3 HR

= 73.33 km/h

Thus, the average speed is 73.33 km/h.

ANSWER:

force =qE

q is CHARGE on particle

E is ELECTRIC field.

Answer:

EXPLANATION:

*************************************************************************************

Uniform ACCELERATION   :    

⇒An Object is said to move in uniform acceleration, if velocity INCREASES  in equal intervals of time.

For example :

A free FALL object posses uniform acceleration.

Non_Uniform acceleration:

⇒An object is said to be with non uniform acceleration if velocity of object changes by unequal amounts in equal intervals of time.

Examples :

All Circular motion type where SPEED is constant and direction changes at every point.

***********************************************************************************

Answer:

when an OBHECT move around a circular path then the OBJECT is SAID to be in circular motion.

circular motion is said to be accelerated motion because it speed never remains CONSTANT

Answer:

25 and 100

EXPLANATION:

Let the TWO RESISTANCE be x and 4x

As they are in parallel net resistance will be (4x)(x)÷(4x+x)

That is 4x^2 ÷5x IMPLIES

4x÷5

Given net resistance is 20 ohm using above eq

4x÷5 =20implies

X=25 THEREFORE the value of resistance are

X=25

4x=4×25=100

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