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

1. It is becomes difficult to walk on a slippery road due to low friction. When we move on ice, it becomes difficult to walk due to low friction of ice.
2. We can not fix nail in the wood or wall if there is no friction. It is friction which holds the nail.
3. A horse can not pull a cart unless friction furnishes him a secure Foothold.
4. We can write on a paper or on a board.
5. Friction helps in applying the brakes.
6. It helps in walking on floor.
7. Coffee mug stays on the dashboard
8. Shuffling across a carpet to shock someone
9. Draging of atmosphire with earth is possible
10. Helps to pevents the life on earth by burning astroids.

0Thank You

Kumar Saksham 6 years, 3 months ago

helps us walk

1Thank You

Abu Umama Usmani 6 years, 3 months ago

Advantage of friction

1Thank You

ANSWER

Derivation of equation of Newton's Second Law of Motion that is F=ma

Posted by #Aditi~ Angel???? 6 years, 3 months ago

CBSE > Class 11 > Physics

2 answers

Ayush Vishwakarma?? 6 years, 3 months ago

Soory aditi ki mai ni aa paya hosital (dil se)??????????????????

1Thank You

Tannu Sharma 6 years, 3 months ago

F is directly proportional to dp/dt F=kdp/dt Here k=1 F=dp/dt F=mdv/dt (m is constant) F=ma (a=dv/dt)

3Thank You

ANSWER

What is the question paper pattern this year according to cbse???????

Posted by Riya Mahapatra 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 6 years, 3 months ago

You can check the marking scheme here : https://mycbseguide.com/cbse-syllabus.html

0Thank You

ANSWER

Derive expression for trajectory path when object is thrown at angle theta with horizontal time of light range maximum height prove R=R' for complementary angles

Posted by Mangesh Patil 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Equation of projectile?

Posted by Suplex City ?? 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Kavya Singh Gaur 6 years, 3 months ago

Y=X^2. Is the eq of parabola.or projectile .

3Thank You

ANSWER

A shell of mass 0.02kg is fired by a gun of mass 100 kg.If the muzzle speed of the shell is 80m/s.What is the recoil speed of the gun?

Posted by #Aditi~ Angel???? 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 6 years, 3 months ago

Given:
Mass of gun=M=100kg
mass of shell =m=0.020kg
Velocity of shell = v=80m/s
Recoil velocity of Gun=V=?
initial velocities of both gun and shell will be zero
so, initial momentum of system will be zero.
According to the law of conservation of momentum,
Initial momentum=Final momentum
so,
0=mv-MV
∴v=mv/M
=0.020x80/100
=0.016m/s
∴recoil velocity of Gun=0.016m/s

1Thank You

ANSWER

The mass of particle is 2.3kg . Two particle of masses 20.15g and 20.17g are added to it what is the total mass of three particle

Posted by Jagabandhu Mishra 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

#Aditi~ Angel???? 6 years, 3 months ago

The total mass of three particle is: m1+ m2+m3= total mass of three particle 2.3 +20.15+20.17= 42.62kg Thanks @diti ?

2Thank You

ANSWER

Unit of Permeability

Posted by Tejas Shedolkar 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Tejas Shedolkar 6 years, 3 months ago

H/m,Wb/A.m

0Thank You

ANSWER

What is law of conservation of linear momentum

Posted by Abhinav Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

2 answers

#Aditi~ Angel???? 6 years, 3 months ago

According to this principle in an isolated system the vector sum of the linear momentum of all the bodies of the system is conserved and is not affected due to their mutual action and reaction. Thanks @diti ?

1Thank You

Drishti Arora 6 years, 3 months ago

It states that the linear momentum of any isolated system always remains constant...

2Thank You

ANSWER

Difference between vectr and scalar

Posted by Pratiksha Rai 6 years, 3 months ago

CBSE > Class 11 > Physics

5 answers

Pratiksha Rai 6 years, 2 months ago

I'm girl and u

0Thank You

Mayank Sharma 6 years, 3 months ago

Scalar - its only magnitude.and vector- its a magnitude and direction

1Thank You

Shubham Kumar 6 years, 3 months ago

1-vector quantity have direction where scaler quantity have not direction

2Thank You

Robinpreet Kaur 6 years, 3 months ago

Tell me please r u girl or boy PLEASEÈEEEEEEEEEEEEEEEE

4Thank You

Robinpreet Kaur 6 years, 3 months ago

Scalar quantity have magnitude only e.g. mass ,speed whereas vector quantity have both magnitude snd direction e.g. velocity etc. OK BABES ☺☺?????????????

2Thank You

ANSWER

When a 300gm mass is hung from a vertical spring, it stretches from equilibrium by 10cm. What work is required to stretch it by 5cm

Posted by Mukesh Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Robinpreet Kaur 6 years, 3 months ago

Hiiiii

1Thank You

ANSWER

A body is placed on an inclined plane and has to be pushed down. The angle made by the normal reaction with vertical will be -..............................

Posted by Pranav Prasad Nr 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 kmph in the same direction, with A ahead of B. The driver of B decides to overtake A and accelerates by 1 m/s² . If after 50 sec, the guard of B just brushes past the driver of A, what was the original distance between them??

Posted by Drishti Arora 6 years, 3 months ago

CBSE > Class 11 > Physics

13 answers

#Aditi~ Angel???? 6 years, 3 months ago

Ok Drishti i will talk to u onlybin this section between 5 to 8ok....or 3 to 6 pm .....u will come na??,.?

1Thank You

Drishti Arora 6 years, 3 months ago

No aditi. I'm now in 11th and I will not skip this section.. Sry I can't come

1Thank You

#Aditi~ Angel???? 6 years, 3 months ago

You are my best friend & i will never forget you...

1Thank You

#Aditi~ Angel???? 6 years, 3 months ago

Hi Drishti come at class 10 section i want to talk to you....very much?????????

1Thank You

Drishti Arora 6 years, 3 months ago

Yeyy aditi!!

2Thank You

#Aditi~ Angel???? 6 years, 3 months ago

U remember me & I remember u a lot miss u very much Bestie .....?????

2Thank You

Drishti Arora 6 years, 3 months ago

Ya ryt aditi. I do remember

2Thank You

#Aditi~ Angel???? 6 years, 3 months ago

U were in brainly app ryt??

3Thank You

#Aditi~ Angel???? 6 years, 3 months ago

Hi Drishti i m ur friend Aditi.....do u remember me?????

2Thank You

Drishti Arora 6 years, 3 months ago

#Gaurav why did u subtract 1000 in ur last step???

3Thank You

Drishti Arora 6 years, 3 months ago

Ya... From Haryana.!!

1Thank You

#Aditi~ Angel???? 6 years, 3 months ago

Hey Drishti do u live in haryana??

2Thank You

Gaurav Seth 6 years, 3 months ago

For train A:
Initial velocity, u = 72 km/h = 20 m/s
Time, t = 50 s
Acceleration, a_I = 0 (Since it is moving with a uniform velocity)
From second equation of motion, distance (s_I)covered by train A can be obtained as:
s = ut + (1/2)a₁t²
= 20 × 50 + 0 = 1000 m

For train B:
Initial velocity, u = 72 km/h = 20 m/s
Acceleration, a = 1 m/s²
Time, t = 50 s
From second equation of motion, distance (s_II) covered by train A can be obtained as:
s_II = ut + (1/2)at²
= 20 X 50 + (1/2) × 1 × (50)² = 2250 m
Length of both trains = 2 × 400 m = 800 m

Hence, the original distance between the driver of train A and the guard of train B is 2250 – 1000 – 800 = 450m.

2Thank You

ANSWER

Ohm law derivation

Posted by Kevin Purwar 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

the radii of two planets are R1 and R2 respectively with density d1 and d2 .Then find ration of acceleration due to gravity at their surfaces?

Posted by Gaurav Baliyan 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Are calculus method for derivation of kinematics equations been deleted from the cbse syllabus this year?

Posted by Moon Majumdar 6 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Drishti Arora 6 years, 3 months ago

Not at all

1Thank You

Ankit Dahiya 6 years, 3 months ago

Surely no

1Thank You

Esha Pal 6 years, 3 months ago

1Thank You

ANSWER

what is centripetal force ?

Posted by Mohd Faizan 6 years, 3 months ago

CBSE > Class 11 > Physics

5 answers

Mohd Faizan 6 years, 3 months ago

aditi give me ur no. I cant understand it

0Thank You

#Aditi~ Angel???? 6 years, 3 months ago

A force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving. Thanks

1Thank You

Drishti Arora 6 years, 3 months ago

Centripetal force is the force acting on a body moving in circular motion along its radius towards the centre which keeps that body moving in that particular motion...

1Thank You

Rahul Raj 6 years, 3 months ago

Any force that acts or directed towards center when a particle moves in circular motion , is called centripital force. Ex- If a body of mass M moves in a circular path having radius R with a uniform speed V. Then in this case its centripetal accln will be V^2/R and centripetal force will be MV^2/R....

1Thank You

Shubhanjali Singh Gaur 6 years, 3 months ago

A force that acts on a body in a moving a circular path and is directed towards the centre around which the body is moving . T - m(v)2/r means m multiplied by v square and devided by r i.e. radius of circular path .

2Thank You

ANSWER

A body of mass 10 kg is placed on an inclined plane of angle 30° . If the coefficient of static friction is 1/√3 . find the force required to just push the body up the inclined surface

Posted by Divyansh Gautam 6 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Ankit Dahiya 6 years, 3 months ago

100N

1Thank You

Kavya Singh Gaur 6 years, 3 months ago

150N bcz on applying 100N ,50N of friction will act towards mg sin Φ balancing the force.

1Thank You

Nitish Kalita 6 years, 3 months ago

100N

5Thank You

ANSWER

A block slides down a rough incline of angle 30 degree with an acceleration g/4 . Find the coefficient of kinetic friction

Posted by Divyansh Gautam 6 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Rahul Raj 6 years, 3 months ago

Use formula:- accln = g(sin30°-u×cos30°) where u is coeff of KF

1Thank You

Rahul Raj 6 years, 3 months ago

Ans:-0.28

1Thank You

Nitish Kalita 6 years, 3 months ago

Answer?

1Thank You

ANSWER

a ball of 1 gram released down an inclined plane describe a circle of radius 10 centimetre in the vertical plane on reaching the bottom what is the minimum height of the inclined plane?

Posted by Divyansh Gautam 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Robinpreet Kaur 6 years, 3 months ago

Mass and radius is given then put the values in formula

1Thank You

ANSWER

Name the weakest force in nature

Posted by Neha Kc 6 years, 3 months ago

CBSE > Class 11 > Physics

5 answers

Shubham Kumar 6 years, 3 months ago

It is gravitational force or force of gravity

0Thank You

Esha Pal 6 years, 3 months ago

Gravitational force

1Thank You

Jassi Midha 6 years, 3 months ago

It's gravitational force.

1Thank You

Gaurav Bagga 6 years, 3 months ago

Gravitational force

1Thank You

Robinpreet Kaur 6 years, 3 months ago

Force of repulsion

1Thank You

ANSWER

Is flying of bird an example of parallelogram law of vector addition ? How

Posted by Rituraj Dadhich 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Madhu Sharma 6 years, 3 months ago

Yes as sum of vectors ;results in uplifting of Bird otherwise bird cannot fly only with help of wings

0Thank You

ANSWER

X^5+X^3+10 find diffriction

Posted by Naveen Pandey 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Rahul Raj 6 years, 3 months ago

Is it differentiation??? If it is then ans would be 5x^4+3x^2 when differentiated w.r.t dx

0Thank You

ANSWER

Calculate the angle of: (A)1° (B)1' (C)1" in radians.Use360°=2πrad, 1°=60' and 1'=60"

Posted by Vishal Yadav 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

List the derivations of kinematics .

Posted by Mehak Gautam 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A coin is dropped from hill of height 80 . Calculate speed of coin after 2 second of drop

Posted by Shreya Parikh 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Kavya Singh Gaur 6 years, 3 months ago

20 m/sec

0Thank You

ANSWER

A particle covers half of the distance with velocity 12 m/s and for rest of the journey moves with velocities 16m/s and 24 m/s during equal intervals. The average velocity of the particle is.

Posted by #Ãbhîst Sîñgh 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Shriyansh Sharma 6 years, 3 months ago

Answer is 60/4=15m/s Let total distance be 4a Average velocity=total distance/total time =4a/(2a/12+t+t) as time interval is Same so 2a=16t+24t So the value of t=a/20 =4a/(2a/12+a/20+a/20) =4a*60/16a =60/4 =15m/s

0Thank You

ANSWER

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