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

Units and dimensions - parallax method motion in a straight line - derivation of kinematic equations by graphical and calculus method. motion in a plane - vector addition, equation of path of projectile including max height, horizontal range and time of flight, uniform circular motion-expression of centripetal acceleration. laws of motion-derivation of first and third law from second law, impulse-momentum theorem, conservation of momentum, relation between angle of friction and angle of repose with resultant acceleration and contact force, motion of a car in leveled road and banked road, bending of cyclist on level road. work, energy and power - expression for KE by calculus method, work-energy theorem for a constant and variable force, motion in vertical circle, PE of a spring, one dimension collision(elastic and inelastic), two dimension collision(elastic and inelastic). system of particles and rotational motion - relations between rotational and linear motion, relation between torque and angular momentum and moment of inertia, mechanical advantages, conservation of angular momentum, rolling motion(energy, velocity, acceleration and time). gravitation - kepler’s laws, relation between g & G, g value above and below the surface of the earth, escape velocity and orbit velocity. mechanical properties of solids - relation between young’s modulus, bulk modulus, shear modulus and poisson’s ratio. mechanical properties of fluids-variation of pressure and depth, Archimedes principle, equation of continuity, bernoulli’s theorem, speed of efflux, venturimeter, terminal velocity, drops & bubbles. thermal properties of matter - linear, areal, volume expansion, thermal stress, newtons law of cooling. thermodynamics - Cp - Cv = R, work done in isothermal, adiabatic process, carnot engine. kinetic theory - law of equipartition of energy, degree of freedom. oscillations - SHM(displacement,velocity,acceleration,amplitude and intensity), spring combinations, time period of simple pendulum, energy in SHM. waves - doppler effect.

2Thank You

ANSWER

Difference between first law nd second law of Newtown ??

Posted by Abhay Raj Meena 22 hours ago

CBSE > Class 11 > Physics

8 answers

Ankit Singh😎😎😎😎😎 3 hours ago

Himanshu

1Thank You

Ankit Singh😎😎😎😎😎 3 hours ago

Kya bhai joking kar rha tha tu

1Thank You

Ankit Singh😎😎😎😎😎 4 hours ago

Yes its newton

1Thank You

Himanshu Shekhar 4 hours ago

Yakshi ab bura mat mañana I am just kidding 😋😋

3Thank You

Himanshu Shekhar 4 hours ago

Yakshi its Newton

3Thank You

Yakshi 😛 19 hours ago

😂😂😂Newtown????

2Thank You

Divyansha Solanki 19 hours ago

Aapki Newton ki spelling wrong h.....😌

1Thank You

Divyansha Solanki 19 hours ago

1st law -when all forces that are at work on a object are balanced that obj will remain in that state forever . If it is moving ,it will remain moving at the same speed and in same direction . Also known as law of inertia . 2nd law-It state that acceleration of an obj is dependent upon two variables , the net force acting upon the obj and the mass of the object .

1Thank You

ANSWER

What is Reynolds no. ????

Posted by Ankit Singh😎😎😎😎😎 22 hours ago

CBSE > Class 11 > Physics

2 answers

Avneet ❤️❤️ 22 hours ago

a dimensionless number used in fluid mechanics to indicate whether fluid flow past a body or in a duct is steady or turbulent.

2Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 22 hours ago

The Reynolds number (Re) is an important dimensionless quantity in fluid mechanics used to help predict flow patterns in different fluid flow situations. At low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers turbulence results from differences in the fluid's speed and direction, which may sometimes intersect or even move counter to the overall direction of the flow (eddy currents).

2Thank You

ANSWER

What is differwnce between slope and gradient

Posted by Himanshu Shekhar 1 day ago

CBSE > Class 11 > Physics

2 answers

Ankit Singh😎😎😎😎😎 23 hours ago

A gradient is a vector, and slope is a scalar. Gradients really become meaningful in multivarible functions, where the gradient is a vector of partial derivatives. With single variable functions, the gradient is a one dimensional vector with the slope as its single coordinate (so, not very different to the slope at all).

3Thank You

Yakshi 😛 1 day ago

The degree of inclination or the rate of ascent and descent is gradient while slope is often used to describe the measurement of the steepness,gradient, incline or grade of a straight line

3Thank You

ANSWER

All important derivation of physics...

Posted by Jai Singh 1 day ago

CBSE > Class 11 > Physics

3 answers

Akash Choudhary Dav Gandhinagar 23 hours ago

All chapters

1Thank You

Ankit Singh😎😎😎😎😎 23 hours ago

Which chapter ????

1Thank You

Yakshi 😛 1 day ago

I can tell u but from which chapter????

4Thank You

ANSWER

Difference between real image and virtual image

Posted by Ishant Pathania 1 day ago

CBSE > Class 11 > Physics

1 answers

Yakshi 😛 23 hours ago

REAL IMAGE:- 1)light rays actually meet to form a real image. 2) is generally inverted 3)can be obtained on a screen 4) this image is in front of mirror and behind the lens 5) we can reach on it Example....cinema screen............VIRTUAL IMAGE:- 1)light do not actually meet to form virtual image 2) is erect 3) image cannot be obtained on the screen 4)behind the mirror and in front of lens 5) we cannot reach to it Example....our image in plane mirror......hope it will help u😅

2Thank You

ANSWER

What is banking of road and what is the significance of banking?

Posted by Christin Mathew 1 day, 2 hours ago

CBSE > Class 11 > Physics

1 answers

Ruru ❤️ 1 day, 2 hours ago

Banking of road increasing the height of road from one side its significance is that it RESUCES friction eg.. on CAR TRACKS

3Thank You

ANSWER

A body is thrown up with an initial velocity u and covers a maximum height of h , then the h is equal to....

Posted by Saba Elias 😊😋🤗 1 day, 3 hours ago

CBSE > Class 11 > Physics

1 answers

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 2 hours ago

Here, initial velocity = u final velocity = 0 (at max. height, velocity is 0) height covered = h acceleration due to gravity = g Using the law of kinematics : v² - u² = 2as we get -u² = -2gh (considering upward direction as positive, "g" is always downward) Thus, we get h = u²/2g

5Thank You

ANSWER

A body of mass 50 kg has a volume of 0.049 m3 . The buoyant force on it is?

Posted by Saba Elias 😊😋🤗 1 day, 4 hours ago

CBSE > Class 11 > Physics

5 answers

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 3 hours ago

Since the net upward force must be equal to the net downward force. So, buoyant force = mg=50x9.8=49kgf

2Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 3 hours ago

Can you see the answer again. Is it 49kg f?

3Thank You

Saba Elias 😊😋🤗 1 day, 3 hours ago

Sorry sis but in the book it is given the option with the answer 49N is right but there is no solution here

1Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 3 hours ago

Mass of body = 50kg volume = 0.049 m^3 Since the density of body is more than density of water, it will sink. When it sinks, it will displace equal volume of water. So volume of water displaced = 0.049 m^3 mass of water = density × volume = 1000×0.049 = 49kg buoyancy = weight of water displaced => buoyancy= mg => buoyancy= 49×10 = 490N Hence, buoyant force is 490N

4Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 3 hours ago

The buoyant force is 490 N.

3Thank You

ANSWER

Explain why mud house are cooler in summer and warmer in winter?

Posted by Saba Elias 😊😋🤗 1 day, 4 hours ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 23 hours ago

Mud houses have thatched roofs.The insulating effect of the thatch prevents heat getting in very quickly (cool in summer) and heat getting out very quickly (warm in winter).
Secondly, mud houses are made up of mud, which has large pores. So the evaporation is more in mud houses. As evaporation causes cooling, mud houses feel cooler in summers.

2Thank You

ANSWER

Which is more elastic steel and rubber?give reason?

Posted by Nrusingha Pradhan 1 day, 4 hours ago

CBSE > Class 11 > Physics

2 answers

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 3 hours ago

Answer- steel Reson- By the definition, steel is more elastic than rubber because steel comes back to its original shape faster than rubber when the deforming forces are removed. Elasticity In Physics And In Common Life: In common life we label a substance as more elastic if it can be stretched more than others

3Thank You

Aaditya Rathore 1 day, 4 hours ago

Steel

1Thank You

ANSWER

What is projectile motion? Find equation for time of flight, range

Posted by Christin Mathew 1 day, 5 hours ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Relation between acceleration due to gravity and gravitational constant

Posted by Guru Deep 1 day, 7 hours ago

CBSE > Class 11 > Physics

2 answers

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 5 hours ago

The acceleration due to gravity depends on the mass of the body, the distance from the center of mass, and a constant G, which is called the "universal gravitational constant". Its value is = 6.673 x 10-11 N. m2/kg2. g=GM/ r^2

2Thank You

Christin Mathew 1 day, 5 hours ago

Acceleration due to gravity is 9.8 m/s2.

0Thank You

ANSWER

Find the temperature at which root mean square velocity of a gas is half if its value at 0 degree celcius pressure remains constant

Posted by Pratya Arora 1 day, 7 hours ago

CBSE > Class 11 > Physics

0 answers

ANSWER

how far away from the surface of earth does the acceleration due to gravity becomes 25% of its value on the surface of earth. given radius of earth is equal to 6400 km

Posted by Navya Sajin 1 day, 11 hours ago

CBSE > Class 11 > Physics

0 answers

ANSWER

why the speed of stationary wave is zero?

Posted by Miti Agrawal 1 day, 15 hours ago

CBSE > Class 11 > Physics

1 answers

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 11 hours ago

as the wave is "standing", so the wave velocity should be 0. ... In the other hand, the energy transmitting along a standing wave is zero if we treat the standing wave as two traveling waves at opposite directions! Then it applies that the velocity of standing wave is zero.

3Thank You

ANSWER

1+1=

Posted by Mohd Danish 1 day, 16 hours ago

CBSE > Class 11 > Physics

8 answers

Himanshu Shekhar 1 day, 1 hour ago

Omg its God's particle!!

1Thank You

Ankit Singh😎😎😎😎😎 1 day, 2 hours ago

😂😂😂😂

2Thank You

Ishita Ishita 1 day, 4 hours ago

Friends shayad usko ni pta hoga.....hum bata dete hai na...arrey iska answer 2 hai....vaise mujhe lagta hai aapne wrong class enter kar li hai...plz look for that...😨😨😨😨

3Thank You

Saba Elias 😊😋🤗 1 day, 4 hours ago

Itna hard question to exam me v nhi puchte h🤣🤣🤣🤣🤣🤣🤣

2Thank You

Yakshi 😛 1 day, 6 hours ago

My god!!!!!!......😨😱mujhey b nai aata.....itna hard question agar exam mein aaya toh hum toh fail e ho jaayenge......😂😂😂

2Thank You

Ankit Singh😎😎😎😎😎 1 day, 11 hours ago

Non sence 😂😂😂😂😂

2Thank You

Aditi Mittal 1 day, 12 hours ago

Nonsense..... 😂😂😂😆😆😆

1Thank You

Avneet ❤️❤️ 1 day, 13 hours ago

Well I don't know .....🤣🤣🤣🤣🤣 Toughest question of the day 🙏🙏🤔🤔🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣

3Thank You

ANSWER

haaa bolo nancy or priya

Posted by Rounak Singh Rajput 1 day, 19 hours ago

CBSE > Class 11 > Physics

2 answers

Aaditya Rathore 1 day, 18 hours ago

Don't upload name of any girl understand

1Thank You

Nancy Rajput 1 day, 19 hours ago

don't upload my name if you want help then I help u

2Thank You

ANSWER

What is mechenical equivalent of heat ??

Posted by Ankit Singh😎😎😎😎😎 1 day, 20 hours ago

CBSE > Class 11 > Physics

5 answers

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 20 hours ago

Your wellcome

2Thank You

Ankit Singh😎😎😎😎😎 1 day, 20 hours ago

2Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 20 hours ago

And for you knowledge - The mechanical equivalent of heat was a concept that had an important part in the development and acceptance of the conservation of energy and the establishment of the science of thermodynamics in the 19th century.

1Thank You

Ankit Singh😎😎😎😎😎 1 day, 20 hours ago

Again thanks ayushi

1Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 20 hours ago

In the history of science, the mechanical equivalent of heat states that motion and heat are mutually interchangeable and that in every case, a given amount of work would generate the same amount of heat, provided the work done is totally converted to heat energy.

1Thank You

ANSWER

What is carnot engine ? Explain please.. fast reply 😐😣😣😣😣😣😣

Posted by Ankit Singh😎😎😎😎😎 1 day, 21 hours ago

CBSE > Class 11 > Physics

8 answers

Ankit Singh😎😎😎😎😎 1 day, 6 hours ago

Thanks priya

0Thank You

Priya Dharshini ☺☺ 1 day, 8 hours ago

It is a reversible heat engine operating between two temperatures. It has a maximum efficiency which no other engine can have.

0Thank You

Ankit Singh😎😎😎😎😎 1 day, 20 hours ago

Thanks

1Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 20 hours ago

According to second law of thermodynamics, no heat engine can have 100% efficiency Carnots heat engine is an idealized heat engine that has maximum possible efficiency consistent with the second law. Cycle through which working substance passed in Carnots engine is known as Carnots Cycle. Carnot's engine works between two temperatures T1 - temperature of hot reservoir T2 - temperature of cold reservoir In a Complete Carnot's Cycle system is taken from temperature T1 to T2 and then back from temerature T2 to T1. We have taken ideal gas as the working substance of cornot engine.

2Thank You

Gaurav Seth 1 day, 20 hours ago

Carnot engine is a theoretical thermodynamic cycle proposed by Leonard Carnot. It gives the estimate of the maximum possible efficiency that a heat engine during the conversion process of heat into work and conversely, working between two reservoirs, can possess.

1Thank You

Ankit Singh😎😎😎😎😎 1 day, 20 hours ago

Hi arun

0Thank You

Arun Venkateshwaran 1 day, 20 hours ago

Hi friends I'm new to this so plz explain about this app😇😊

0Thank You

Ankit Singh😎😎😎😎😎 1 day, 21 hours ago

Please reply anyone

0Thank You

ANSWER

Hey anyone there......i hav a question....

Posted by Prefer To Be Anonymous👻 1 day, 22 hours ago

CBSE > Class 11 > Physics

7 answers

Ankit Singh😎😎😎😎😎 1 day ago

What is your question .........

0Thank You

Prefer To Be Anonymous👻 1 day, 9 hours ago

Hyy......my ques. Is....

0Thank You

Ankit Singh😎😎😎😎😎 1 day, 19 hours ago

👍👍

0Thank You

Yakshi 😛 1 day, 20 hours ago

Shoot it!

2Thank You

Priya Dharshini ☺☺ 1 day, 21 hours ago

Which question ?

1Thank You

Ankit Singh😎😎😎😎😎 1 day, 21 hours ago

Yes tell

0Thank You

Nancy Rajput 1 day, 22 hours ago

yes tell

0Thank You

ANSWER

A stone is dropped from a height of 45m. What will be the distance travelled by it during the last second of its motion?(g=10m/s2)

Posted by Saba Elias 😊😋🤗 1 day, 22 hours ago

CBSE > Class 11 > Physics

8 answers

Nancy Rajput 1 day, 21 hours ago

ok sis

1Thank You

Nancy Rajput 1 day, 21 hours ago

its half gravutatuon force and the in last second it shouls be 2n-1

1Thank You

Saba Elias 😊😋🤗 1 day, 21 hours ago

Thnx 2 botg

0Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 21 hours ago

total time taken=(2h/g)1/2 = (2*45/10) ½ = (9) ½ = 3 distance travelled in last sec = S= u + a/2 (2n-1) S= 0 + 10/2 (2*3 – 1) = 25 m

2Thank You

Nancy Rajput 1 day, 21 hours ago

total time taken=(2h/g)1/2 = (2*45/10) ½ = (9) ½ = 3 =>for last second of its motion .... =>distance travelled in last sec = S= v0+ a/2 (2n-1) S= 0 + 10/2 (2*3 – 1) =0+5(6-1) =0+5(5) = 25 m

1Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 22 hours ago

1Thank You

Saba Elias 😊😋🤗 1 day, 22 hours ago

Ayushi plz give me the full solution

1Thank You

Ayushi Chaurasiya Ayushi Chaurasiya 1 day, 22 hours ago

Answer - 25m distance

3Thank You

ANSWER

The motio of planet in the solar system is an example of the conservatio of

Posted by Arquam Shaikh 1 day, 22 hours ago