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In repulsive sort of motor we use Normally wires as a commutator

on the slippery ground friction is much less

On the slippery ground, the friction is much less and we cannot exert a backward action force on it which would produce a forward reaction force on us. Hence, it becomes difficult to walk on a slippery road.

When we jump on a muddy floor, the floor is carried in the direction of the jump and the time interval \[\Delta t\]for which force acts is increased. This decreases rate of change of momentum and hence the force of reaction. Therefore we are hurt less.

switches,three type of wire,and other wiring material

net force acting on the system = 200Ntotal mass = (15+10) = 15kg

so acceleration = net force/total mass = 200/25 = 8m/s²

both the blocks will move with same acceleration.

option 3

thanx bro

crystallization is the process by which crystals of salt etc are produced while doing experiment in Science.

6N because mass is constant in universe its un changed

and hence g is also universal constant

An atom is the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element.

Elements are made of atoms, and the structure of the atom determines how it will behave when interacting with other chemicals. The key in determining how an atom will behave in different environments lies in the arrangement of electrons within the atom.

As v= k(yi + xi)vₓ= Ky so dₓ/dt = Kyvy= Kₓ so dy/dt = Kₓ

dividing both equationsdy/dₓ= dy/dt divide dx/dt = Kx/Ky =x/yyou will getydy= xdx

integrating the equationy²/2 = x²/2 + c

Hence, option (1) is correct.

As index of refraction value increases, the optical density increases, and the speed of light in that material decreases.

Therefore, velocity of light is minimum for medium N and maximum for medium K

option D glass is the answer.

Question you have submitted is incomplete. Please post a complete question.

we have to find distance from the graph.Here graph is velocity to time.By finding area we can get distance.so distance=1/2*20*5+20*5+1/2*10*5 =50+100+25=175m

Here parallactic angle, ø=1°54'=114'=(114×60)"=114×60×4.85×10^-6 rad = 3.32×10^-2 radBasis, b=AB=1.276×10^7 mSo, the distance of the moon from the earth, S= b/ø =(1.276×10^7)÷(3.32×10-2)= 3.84×10^8 (ans)

Here parallactic angle, ø=1°54'=114'=(114×60)"=114×60×4.85×10^-6 rad = 3.32×10^-2 radBasis, b=AB=1.276×10^7 mSo, the distance of the moon from the earth, S= b/ø =(1.276×10^7)÷(3.32×10-2)= 3.84×10^8 (ans)

thaks

The figure shows thefield lines.If a negative charge is placed at extreme right or extreme left, the charge will experience a net force in opposite direction. Also, on the line perpendicular to the line joining the charges, the negative charge will experience a net force towards the centre of system.

As I said, “Up” is a relative direction. Therefore, in any of the above configuration, for some reference frame, the force will act “vertically Up”.

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Hence, option (1) is correct.

1+3+5+7+9+....+1999+20012001=1+(n-1)22000=2(n-1)n-1=1000n=1001S1001=(1001/2)(1+2001)=1001/2(2002) =1001*1001=1002001

Heat is a form of energy that can be transferred from one object to another or even created at the expense of the loss of other forms of energy.Joule is unit of energy

Heat is the form of energy that is transferred between two substances at different temperatures. The direction of energy flow is from the substance of higher temperature to the substance of lower temperature.

Given, length of wire, l = 2m

cross sectional area , A = 10^-4 m²

Load , F = 102kgwt = 102 × 9.8 N

extension of wire, ∆l = 0.1cm = 0.001m

Longitudinal stress = F/A

= 102 × 9.8/(10^-4)

= 999.6 × 10^4 ≈ 1 × 10^7 N/m²

Longitudinal strain. = extension of wire/original length of wire = ∆l/l

= 10^-3/2 = 5 × 10^-4

we know, Young's modulus = longitudinal stress/longitudinal strain

= 1 × 10^7/5 × 10^-4

= 20 × 10^9 N/m²

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Since the water attains zero velocity immediately after impact with palm , the force acting on it will be (Density)(Area) [(velocity)^2] because this is actually the momentum of the water flowing per second, which is actually force.

I was able to write this because AreaxVelocity is Quantity of Water flowing per second. Multiply this by Density , you get Mass of water flowing per second. Multiply this by velocity and you get momentum flowing per second. You can check that the dimensions of this formula have the same dimensional formula as that of force.

Now putting the values, we obtain the answer b.) 22.5 N

Let the side of the cube be ‘a’ cm and its mass be ‘m’.

So, density of the cube is, ρ = m/a^3

Let ‘h’ be the immersed height of the cube.

So, volume immersed = ha^2

And, mass of water displaced = (ρw)ha^2

For floatation, weight of water displaced = weight of cube

=> (ρw)ha^2g = mg

=> m = (ρw)ha^2

Again, when 300 g is added to the cube the cube is immersed further by 3 cm.

So, the new volume of water displaced = (h+2)a^2

The new mass of water displaced = (ρw)(h+2)a^2

Thus,

(ρw)(h+3)a^2g = (m+300)g

=> (ρw)(h+3)a^2= (ρw)ha^2+300

For water. ρw= 1 g/cm3

So,

(h+3)a^2= ha^2+ 300

=> ha^2+ 3a2= ha^2+ 300

=> a = 10 cm

This is the length of a side of the cube.

Eyesare organs of the visual system.

They provide organisms with vision, the ability to receive and process visual detail, as well as enabling several photo response functions that are independent of vision.

Eyesdetect light and convert it into electro-chemical impulses in neurons.

10/2-3A= 5-3= 2A

Option-A

option A is the right answer.

Theribosomeis a complex molecule made ofribosomalRNA molecules and proteins that form a factory for protein synthesis in cells. In 1955, George E. Palade discoveredribosomesand described them as small particles in the cytoplasm that preferentially associated with the endoplasmic reticulum membrane

ribosome is a cell organelle. It functions as a micro-machine for making proteins. Ribosomes are composed of special proteins and nucleic acids. The TRANSLATION of information and the Linking of AMINO ACIDS are at the heart of the protein production process.A ribosome, formed from two subunits locking together, functions to: (1) Translate encoded information from the cell nucleus provided by messenger ribonucleic acid (mRNA), (2) Link together amino acids selected and collected from the cytoplasm by transfer ribonucleic acid (tRNA). (The order in which the amino acids are linked together is determined by the mRNA) and, (3) Export the polypeptide produced to the cytoplasm where it will form a functional protein.

B. 6

Explaination : Electronic configuration of Oxygen = 2, 6.

Electrons in the outermost orbit are called valence electronsPlease hit the like button if this helped you.

One electron possesses a charge of 1.6 ×10-19C, i.e., 1.6 ×10-19C of charge is contained in 1 electron.

∴ 1 C of charge is contained in 1/1.6 x 10-19= 6.25 x 1018= 6 x 1018

Therefore,6 x 1018electrons constitute one coulomb of charge.

The charge on an electron is negative and it is -1.6⨯10-19coulomb therefore, 1 C charge is carried by 1/ (-1.6⨯10-19) = 6.25 ⨯ 1018electrons.

Hence if 1 A current flows through a conductor, it implies that6.25 ⨯ 1018electrons pass per a second across the cross section of the conductor.

ThePropagation of sound.Soundis a sequence of waves of pressure whichpropagatesthrough compressible media such as air or water. (Soundcanpropagatethrough solids as well, but there are additional modes ofpropagation). During theirpropagation, waves can be reflected, refracted, or attentuated by the medium

Yes option 2). is correct because we just need to multiply both sides by dot product of v.

Option (3) is correct.