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What is grandfather paradox?

Posted by Bikash Boro 4 years ago

CBSE > Class 11 > Physics

1 answers

Sia ? 3 years, 11 months ago

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.

ANSWER

Extra questions

Posted by Aman G 4 years ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Jai Hind Dosto ??

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

CBSE > Class 11 > Physics

5 answers

Drishty Kamboj 3 years, 11 months ago

Jai hind bro

Nidhi ? Bhola ? 4 years ago

Jai hind sir ji

Abhay Tripathi 4 years ago

Jai hind

Aastha ?✨ 4 years ago

Jai hind

Lomror ? 4 years ago

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

ANSWER

What is r not

Posted by Sm .. 4 years ago

CBSE > Class 11 > Physics

5 answers

. .. 4 years ago

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

Sm .. 4 years ago

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

. .. 4 years ago

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

Sm .. 4 years ago

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

Sm .. 4 years 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

ANSWER

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 ago

CBSE > Class 11 > Physics

5 answers

. .. 4 years ago

Yrr**

. .. 4 years ago

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

Sm .. 4 years ago

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

Sm .. 4 years ago

Hm maine jan bujh kar qsn galat diya tha..

. .. 4 years ago

Doubt hai...-3 aa raha hai

ANSWER

Unit of permittivity of free space

Posted by Sm .. 4 years ago

CBSE > Class 11 > Physics

5 answers

Sm .. 4 years ago

Correct

. .. 4 years ago

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

Sm .. 4 years ago

Hm value correct hai ..

Sm .. 4 years ago

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

. .. 4 years ago

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

ANSWER

Unit of permitivitty

Posted by Sm .. 4 years ago

CBSE > Class 11 > Physics

5 answers

Sm .. 4 years ago

Tumhari I'd active h ya nhi

. .. 4 years ago

Kya nahi sununga???

Sm .. 4 years ago

Tum sunoge nhi isiliye maine kaha k rhne do

Sm .. 4 years ago

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

. .. 4 years ago

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

ANSWER

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 ago

CBSE > Class 11 > Physics

5 answers

. .. 4 years ago

???

Sm .. 4 years ago

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

. .. 4 years ago

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

Sm .. 4 years ago

Hm correct. Yaha par itna type krenge..?

Pk .. 4 years ago

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

ANSWER

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

Posted by Anjali 4 years ago

CBSE > Class 11 > Physics

2 answers

Sundaram Katare 4 years ago

IT

Arnav Bhai 4 years ago

IT

ANSWER

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

Posted by Swagat Sourav 4 years ago

CBSE > Class 11 > Physics

3 answers

Gagandeep Singh 4 years ago

Pradeep is best for science And RD Sharma for maths

M Sujith Sali 4 years ago

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

Sm .. 4 years ago

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

ANSWER

Distinction

Posted by Rohan Mane 4 years ago

CBSE > Class 11 > Physics

1 answers

Sia ? 3 years, 11 months ago

a difference or contrast between similar things or people.

ANSWER

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

Posted by Tanu Pal 4 years ago

CBSE > Class 11 > Physics

1 answers

Sia ? 3 years, 11 months ago

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

ANSWER

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 ago

CBSE > Class 11 > Physics

1 answers

Priyanshu Kalondia 3 years, 11 months ago

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

ANSWER

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

Posted by Naveen Kumar 4 years ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years ago

ANSWER

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 ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years ago

Please ask question with complete information.

ANSWER

CBSE 10 exams cancelled and 12 exams postponed.

Posted by Dhruv .. 4 years ago

CBSE > Class 11 > Physics

1 answers

??Bees King?? 4 years ago

So ....good news☺️☺️

ANSWER

Prove that angle of repose is equal to angle of friction

Posted by Taranjit Kaur 4 years ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Prove that projectile motion is parabola?

Posted by Prema Majhi 4 years ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years 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 + $\frac 12$ a_xt²
Putting ux = ucosθ and ax = 0 we have
x = (u cos θ)t + $\frac 12$ (o)t²
or x = (u cos θ)t
or t = $\frac x{u \cos \theta}$ ....... (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 + $\frac 12$ a_yt²
Putting uy=usinθ and ay=−g we have
y = (u sin θ)t + $\frac 12$ (−g)t²
or y = (u sin θ)t − $\frac 12$ gt².....(2)
Putting the value of t from equation (1) in equation (2) we get
y = (u sin θ) $\frac x{u \cos \theta}$ − $\frac 12$ g( $\frac x{u \cos \theta}$ )²
or y = x tan θ − ( $\frac g{2\ u^2\ cos^2\theta}$ )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.

ANSWER

State and prove Laws of conservation of angular momentum

Posted by Prema Majhi 4 years ago

CBSE > Class 11 > Physics

2 answers

Samriddhi Mishra 4 years ago

Torque=dL/dt =0 Hence, L= constant

Samriddhi Mishra 4 years ago

The total external energy torque acting on a rigid body is 0 , the total angular momentum is conserved

ANSWER

Yrrr guy's kl physics ka exam h bht ganda wala dr lg rha

Posted by Samriddhi Mishra 4 years ago

CBSE > Class 11 > Physics

5 answers

Samriddhi Mishra 4 years ago

Hnn hoping so ki Acha hi ja

Scientist ..????? 4 years ago

Are dro mt bs pdo jitna pd skte ho na bss utna hii jyada mind ko stress mt do

Mamta ... 4 years ago

bilkul daro mat Vanshika..... tumahara exam bohot acchha jaega....bas formulas ko revise karte raho.

Samriddhi Mishra 4 years ago

Final term Ka exam h yrr

Seraj ??? 4 years ago

Dar kyu rhi ho.jake padho fresh mind se.

ANSWER

Huaa ki nahi mamta

Posted by Scientist ..????? 4 years ago

CBSE > Class 11 > Physics

3 answers

Mamta ... 4 years ago

Mera name Mamta hai telegram pe......do one thing aap mujhe apka username batao

Scientist ..????? 4 years ago

App ki kya he profile pic or full name telegrame me

Mamta ... 4 years ago

what's ur profile pic dude

ANSWER

App ko me kis name se serch kru

Posted by Scientist ..????? 4 years ago

CBSE > Class 11 > Physics

5 answers

Scientist ..????? 4 years ago

Sun he or ram ram ji likha he

Mamta ... 4 years ago

apka profile pic kya

Mamta ... 4 years ago

okk no problem aap karo download

Scientist ..????? 4 years ago

Ap meko msg kro Saransh patil

Mamta ... 4 years ago

Mamta

ANSWER

Ap kon si class me ho mamta

Posted by Scientist ..????? 4 years ago

CBSE > Class 11 > Physics

4 answers

Mamta ... 4 years ago

telegram pe baat ho sakti hai

Scientist ..????? 4 years ago

Mtlb ab bat nahi hogi apni

Scientist ..????? 4 years ago

Aacha to thik he

Mamta ... 4 years ago

Ye hamari chats baki guys ko disturb karegi dear

ANSWER

If x ˆ ˆ and y are unit vectors at an angle  , find x y ˆ ˆ 

Posted by Shuchita Jaisingh 4 years ago

CBSE > Class 11 > Physics

0 answers

ANSWER

It is because...just shall we be friends

Posted by Scientist ..????? 4 years ago

CBSE > Class 11 > Physics

5 answers

Scientist ..????? 4 years ago

App kon si class me ho

Mamta ... 4 years ago

kismai

Scientist ..????? 4 years ago

Wese ap ka kon sa subject ye

Scientist ..????? 4 years ago

Thanks

Mamta ... 4 years ago

Ohk

ANSWER

obtain an expression for centre of mass of two body system by my cbse guid3

Posted by Shuchita Jaisingh 4 years ago

CBSE > Class 11 > Physics

1 answers

Garveet Manral 4 years ago

Apani gaand doga to batao ya mera mu ma loga mujhe gand dedo ma bata duunga sara answer maja bhi aa jayega apako ??

ANSWER

What is the relation between impulse and momentum

Posted by Scientist ..????? 4 years ago

CBSE > Class 11 > Physics

4 answers

Scientist ..????? 4 years ago

Me mera number du app btao ge kya

Mamta ... 4 years ago

haa but yaha bohot complicated lagega aapko read karte time

Scientist ..????? 4 years ago

Are esa koe mathematical proof de skte ho kya app

Mamta ... 4 years ago

The impulse experienced by the object equals the change in momentum of the object.

ANSWER

How is angular momentum related to linear momentum?

Posted by Scientist ..????? 4 years ago

CBSE > Class 11 > Physics

1 answers

Mamta ... 4 years ago

Angular momentum of an object with linear momentum is proportional to mass, linear velocity, and perpendicular radius from an axis to the line of the object's motion.

ANSWER

Write the dimensions and si units of linear momentum

Posted by P Hema 4 years ago

CBSE > Class 11 > Physics

2 answers

Scientist ..????? 4 years ago

SI unit= kgm/s

Scientist ..????? 4 years ago

Dimension - MLT-1

ANSWER

Projectile unotion

Posted by Ankit Yadav 4 years ago

CBSE > Class 11 > Physics

1 answers

Scientist ..????? 4 years ago

The motion of a body thrown with some initial horizontal velocity and then allowed to move in 2D under the action of gravity.

ANSWER

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