CBSE > Class 11 > Physics | CBSE Board | Homework Help

The grandfather paradox is a paradox of time travel in which inconsistencies emerge through changing the past. The name comes from the paradox's description: a person travels to the past and kills their own grandfather before the conception of their father or mother, which prevents the time traveller's existence.

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Explain how will you measure to the size of an astronomical object?

Posted by Ishita ❣️❣️ 4 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Shubham Kumar 4 years, 4 months ago

U have any doubt u can ask me on snap I'd shubhamkuma8437

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Shubham Kumar 4 years, 4 months ago

By using parallax method According to parallax method Parallax Method: When an object is seen by closing our right and left eye alternatively, there is a shift in the position of the h other. O is called parallax angle. The distance LR is called basis.

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What is electromagnetic theory

Posted by Harish Karthick 4 years, 4 months ago

CBSE > Class 11 > Physics

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Sia ? 4 years, 4 months ago

Electromagnetic theory based on Maxwell's equations establishes the basic principle of electrical and electronic circuits over the entire frequency spectrum from dc to optics. ... Coulomb's law for electric field and potential and Ampere's law for magnetic field govern the physical principles.

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How to find magnitude of vector

Posted by Dipak Kakuniya 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 4 months ago

As we know, the vector is an object which has both the magnitude as well as direction. To find the magnitude of a vector, we need to calculate the length of the vector. Quantities such as velocity, displacement, force, momentum, etc. are vector quantities. But speed, mass, distance, volume, temperature, etc. are scalar quantities. The scalar has the only magnitude, whereas the vectors have both magnitude and direction.

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What did Einstein said about twin paradox?

Posted by Bikash Boro 4 years, 4 months ago

CBSE > Class 11 > Physics

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What is grandfather paradox?

Posted by Bikash Boro 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 4 months ago

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Extra questions

Posted by Aman G 4 years, 5 months ago

CBSE > Class 11 > Physics

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Jai Hind Dosto ??

Posted by ?Sᴀʀᴋᴀʀ? ▄︻┻┳═一 ? Ꭰꭿꭰꭰꮍ ? 4 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

Drishty Kamboj 4 years, 4 months ago

Jai hind bro

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Nidhi ? Bhola ? 4 years, 4 months ago

Jai hind sir ji

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Abhay Tripathi 4 years, 4 months ago

Jai hind

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Aastha ?✨ 4 years, 5 months ago

Jai hind

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Lomror ? 4 years, 5 months ago

??????????jai hind

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What is r not

Posted by Sm .. 4 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

. .. 4 years, 5 months ago

Haa 3 hi aa raha hai.... towards the left of 1 coulomb

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Sm .. 4 years, 5 months ago

Just usi qsn me dusra value maine mention kiya hua h dekho toh.. syd tumhare me bhut slow show kar rha h answer

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. .. 4 years, 5 months ago

Not initial ke liyea use karte hai....ya standard ke liyea....sayad initial radius with refrence to change in medium....

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Sm .. 4 years, 5 months ago

Ha syd qki vo MEDIUM se medium change hota h uska value toh may b ho skta h

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Sm .. 4 years, 5 months ago

Maine qsn galat hi diya tha test kar rhi thi..ki mujhse qsn bnte h ya nhi nai value change ki thi solly.. tum dusla wala value put kalo na

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A charge Q1= +2 c and Q2 = +4c are fixed at a separation of 3m . Where should you placed the third charge q so that the entire system is in equilibrium

Posted by Sm .. 4 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

. .. 4 years, 5 months ago

Yrr**

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. .. 4 years, 5 months ago

??kyu??? Nahi her question galat kaise ho sakta hai....tum batao....I quit

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Sm .. 4 years, 5 months ago

Value change karo.. Q1 = +1c Q2 = -4c distance is 1m

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Sm .. 4 years, 5 months ago

Hm maine jan bujh kar qsn galat diya tha..

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. .. 4 years, 5 months ago

Doubt hai...-3 aa raha hai

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Unit of permittivity of free space

Posted by Sm .. 4 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

Sm .. 4 years, 5 months ago

Correct

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. .. 4 years, 5 months ago

Option... b ....coulomb square per Newton per metre sq.

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Sm .. 4 years, 5 months ago

Hm value correct hai ..

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Sm .. 4 years, 5 months ago

Option a) coulomb/newton-metre ... b) coulomb^2/newton-metre^2... c) newton-metre^2/coulomb d) coulomb^2 / (newton-metre)^2

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. .. 4 years, 5 months ago

Value ....it is 8.85×10^-12 farad/metre

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Unit of permitivitty

Posted by Sm .. 4 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

Sm .. 4 years, 5 months ago

Tumhari I'd active h ya nhi

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. .. 4 years, 5 months ago

Kya nahi sununga???

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Sm .. 4 years, 5 months ago

Tum sunoge nhi isiliye maine kaha k rhne do

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Sm .. 4 years, 5 months ago

I don't know k ye sahi h ya galat .. qsn kuch aur tha wait

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. .. 4 years, 5 months ago

Farad/metre and dimensional formula is M^-1 L^-3 A^2 T^4.

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If three equal charges q are located on three vertices of an equilateral triangle and another charge Q is situated at the centoriod of the triangle find the force experienced by the charge Q

Posted by Sm .. 4 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

. .. 4 years, 5 months ago

???

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Sm .. 4 years, 5 months ago

Mere pass bhut se qsn h MCQ but kya Karen..?? ha possible h dusra option but rhne do

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. .. 4 years, 5 months ago

Dushra option ??? One line wala pucho? like properties ...concept clear hoga...

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Sm .. 4 years, 5 months ago

Hm correct. Yaha par itna type krenge..?

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Pk .. 4 years, 5 months ago

2Fsin30° in positive y-axis and F in negative y-axis . Therefore resultant force on charge Q is zero.

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Can someone please tell what are the additional subjects we can choose in PCM?

Posted by Anjali 4 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Sundaram Katare 4 years, 5 months ago

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Arnav Bhai 4 years, 5 months ago

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Which referance book is good for class 11 science. I need all referance book for all subject

Posted by Swagat Sourav 4 years, 5 months ago

CBSE > Class 11 > Physics

3 answers

Gagandeep Singh 4 years, 4 months ago

Pradeep is best for science And RD Sharma for maths

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M Sujith Sali 4 years, 5 months ago

Best physics - HC verma, bio and chemistry - finger tips. Believe me.....

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Sm .. 4 years, 5 months ago

Physics- sl arora . Math - rd sharma and for rest you can only prefer Ncert it's more than enough

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Distinction

Posted by Rohan Mane 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 4 months ago

a difference or contrast between similar things or people.

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What happens to change in internal energy of a gas during isothermal expansion

Posted by Tanu Pal 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 4 months ago

isothermal expansion temperature remains constant therefore change in internal energy is also constant.

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At what height above the earth surface the value of acceleration due to gravity is same as in a mine 100km deep

Posted by Naveen Kumar 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Priyanshu Kalondia 4 years, 4 months ago

Acceleration due to gravity is same everywhere. It varies only on equators

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What is the depth below the earth surface where acceleration due to gravity become 70% on earth surface

Posted by Naveen Kumar 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 5 months ago

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What is the magnitude and direction of the electric field at the centre of square.+q -2q +2q -q?

Posted by Arohi Nathan 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 5 months ago

Please ask question with complete information.

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CBSE 10 exams cancelled and 12 exams postponed.

Posted by Dhruv .. 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

??Bees King?? 4 years, 5 months ago

So ....good news☺️☺️

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Prove that angle of repose is equal to angle of friction

Posted by Taranjit Kaur 4 years, 5 months ago

CBSE > Class 11 > Physics

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Prove that projectile motion is parabola?

Posted by Prema Majhi 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 5 months ago

Path of a projectile
let OX be a horizontal line on the ground and OY be a verticle line O is the origin for X and Y axis Consider that the projectile is fired with velocity u and making angle θ with the horizontal form the point ′O′ on the ground
The velocity of projection of the projectile can be resolved into the following two components
(i) u_x= ucosθ, alongOX
(ii) u_y= usinθ, alongOY
As the projectile moves it covers distance along the horizontal due to the horizontal component ucosθ of the velocity of projection and along verticle due to the vertical component usinθ . let that any time t , the projectile reaches the point P , So that its distance along the X and Y axis are given by x and y respetively.
Motion along horizontal direction : it we neglect friction due to air, then horizontal component of the velocity i.e. ucosθ will remain constant. thus
Initial velocity along the horizontal u_x= ucosθ
Acceleration along the horizontal a_x = 0
The position of the projectile along X-axis at any time t is given by
x = u_xt + {tex}\frac 12{/tex}a_xt²
Putting ux = ucosθ and ax = 0 we have
x = (u cos θ)t + {tex}\frac 12{/tex}(o)t²
or x = (u cos θ)t
or t = {tex}\frac x{u \cos \theta}{/tex} ....... (i)
Motion along verticle direction:
The velocity of the projectile along the verticle goes on decreasing due to effect of gravity initial velocity along vertical u_y= usinθ
Acceleration along vertical a_y=−g
The position of the projectile along T-axis at any time t is given by
y = u_yt + {tex}\frac 12{/tex}a_yt²
Putting uy=usinθ and ay=−g we have
y = (u sin θ)t + {tex}\frac 12{/tex}(−g)t²
or y = (u sin θ)t − {tex}\frac 12{/tex}gt².....(2)
Putting the value of t from equation (1) in equation (2) we get
y = (u sin θ) {tex}\frac x{u \cos \theta}{/tex} − {tex}\frac 12{/tex} g({tex}\frac x{u \cos \theta}{/tex})²
or y = x tan θ − ({tex}\frac g{2\ u^2\ cos^2\theta}{/tex})x²...(3)
This is an equation of a parabola . hence the path of projectile projected at some angle with the horizontal direction is a parabola.