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

Impulse is defined as a force multiplied by time it acts over. For example: Tennis racket strikes a ball, an impulse is applied to the ball. The racket puts a force on the ball for a short time period.

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Relation between acceleration displacement and frequency of a particle executing in SHM

Posted by Abhinay Srivastava 4 years, 9 months ago

CBSE > Class 11 > Physics

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Energy of satellite

Posted by Hira Lala 4 years, 9 months ago

CBSE > Class 11 > Physics

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Pressure of ges

Posted by Swarup Swapnil 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Manjeet Sahu 4 years, 9 months ago

Where p is pressure, n is no. Of moles of gases, R is universal gas constant, T is temperature and V is Volume

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Manjeet Sahu 4 years, 9 months ago

P=nRT/V

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Q26) an object is travelling with an initial velocity u and is uniformly accelerated by 'a' attains a final velocity 'v'. plot a velocity time graph for this motion of the body and prove that area under the velocity time graph is numerically equal to displacement.

Posted by Pearl ? 4 years, 9 months ago

CBSE > Class 11 > Physics

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Scalar product and its properties

Posted by Priyanshu Prajapati 4 years, 9 months ago

CBSE > Class 11 > Physics

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Account Deleted 4 years, 9 months ago

It shows Magnitude and unit is called scalar quantity.

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Show that for small osullations motion of a pendulum is in S.H.M

Posted by Riya Shah 4 years, 9 months ago

CBSE > Class 11 > Physics

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Abhinav Chauhan 4 years, 9 months ago

A pendulum moves in such a way that angle is formed by it is θ , as you know , along tangent , motion of pendulum is just opposite to force. As shown in figure. Here what you see both the above conditions are satisfied when displacement of pendulum is small.

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Two satellites are revolving round the earth at different heights. The ratio of their orbital speeds is 2:1. If one of them is at a height of 100km, the height of the other satellite is (Radius of earth R=6400 km )

Posted by Vedika Sharma 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Abhinav Chauhan 4 years, 9 months ago

Orbital velocity is given by: V=R+hGM Where G is the Universal Gravitational constant, M is the mass of the Earth, h is the height of the satellite from the earth's surface and R is the radius of the earth. V∝R+h1 V2V1=R+h1R+h2 Given: V2V1=12, h1=100 km and R=6500 km ⇒12=6400+1006400+h2 ⇒6400+h2=4×6500=26000 km Hence, the height above the earth's surface, h2=26000−6400=19600 km

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Using dimensional analysis derive a formula in which the time period of a spring depends on mass of the body and spring constant of the spring.

Posted by Annn Nnn 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Kamlesh Verma 4 years, 9 months ago

T=[M]^a[K]^b

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Kamlesh Verma 4 years, 9 months ago

T - time period , T = D[M^a][K^b] : D- some constant ,M- mass ,K- spring constant

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3 law of motion

Posted by Sonu Kalyanpura 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Swastik . P 4 years, 9 months ago

1) when a object is in motion or rest it will always be in motion/rest untill external force is applied to it 2) Momentum varies directly with applied force w.r.t time 3) For every action there is opposite reaction

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Lakshay Dhall 4 years, 9 months ago

Every action there is an equal and opposite reaction

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Define type of product in vector

Posted by Pratika Parmar 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Sanika Komawar 4 years, 9 months ago

There are 2 types of products in vector 1) dot product- A.B 2)Cross product- A×B....

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2 mass 100kg and 1000kg place 1meter away . Due to both where the value of gravitational accelaration will be zero

Posted by Deeksha Deora 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Abhinav Chauhan 4 years, 9 months ago

https://www.topperlearning.com/doubts-solutions/there-are-two-bodies-of-mass-100kg-and-10000kg-separated-by-a-distance-1mat-what-distance-from-the-smaller-body-is-the-intensity-of-gravitational-fiel-orth0o

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What do you mean by torque

Posted by Priti Yadav 4 years, 9 months ago

CBSE > Class 11 > Physics

3 answers

Bharti Chaudhary 4 years, 9 months ago

The vector product of force and distance from axis of rotation for centre of mass

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Lakshay Dhall 4 years, 9 months ago

Angular force is known as torque

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Cutiee Sujii 4 years, 9 months ago

It is a rotational analogue of force, also commonly known as moment of force.

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Parallax method....?

Posted by Anushika Dubey 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Abhishek Gupta 4 years, 9 months ago

Parallax is the displacement or the change in the apparent position of the object when viewed from two different points of view. The two points of view have their own line of sights and parallax is measured as half of the angle between the two lines of sights. When you are traveling in a vehicle and you look around as you are moving, you will see that objects in the distances appear to move more slowly than the objects closer to you. This is the effect of parallax. Nearby objects have a larger parallax than the distant objects, so the parallax can be used to determine distances. The phenomenon of parallax, when combined with triangulation, will yield the location of the object with considerable accuracy. Astronomers regularly use the parallax method to measure the distances of the closer stars. Distance Measurement by Parallax Distance measurement by parallax is a special application of the principle of triangulation. From triangulation, we knew that a triangle can be described completely if two angles and sides are known. In the image shown above, the distance of a distant star is being calculated. The star being closer to earth than the far away starts exhibits a finite parallax value. This way, we can obtain the value of the parallax angle by viewing the star from two known points on Earth forming the baseline of the triangle. Let’s define the parallax half-angle from two distinct points on Earth as ‘p’. Here the maximum value of‘ ‘d’ is the radius of Earth and the distance of the star can be assumed to be only slightly farther than the sun. Here the value of the distance from the sun is many magnitudes smaller than the radius of the earth due to which the value of the parallax angle we get is extremely small. Too small to be even detected. This is the fact behind, why the great Astronomer Cassini and his colleagues were unsuccessful in finding the parallax for even a single star. This was considered by his detractors to be proof that heliocentricity was wrong. Cassini’s theory was correct but the least count of the equipment used then wasn’t small enough. Application Assuming the angle ‘p’ is small, the distance to the object measured in parsecs (in terms of speed of light) is equal to the reciprocal of the parallax angle measured in arcseconds. D(parsec)=1p(arcsec) In order to overcome the problem of the small ratios, star parallax is most often measured using annual parallax which is defined as the difference in the position of a star as seen from the earth and sun. Instead of taking the fixed baseline as the Earth’s radius, the fixed baseline is taken as the radius of Earth’s revolution around Earth which increases the size of the baseline therefore the top angle making it easier to measure. Measurement of stellar distances and the parallax angle in terms of distancesUnfortunately, the ground-based telescopes can only measure parallax reliably for stars that are within a few hundred light-years from us. Telescopes above the atmosphere such as the Hubble Telescope can measure smaller parallax shifts and thus larger distance, but even in that case the most distant objects for which distance can be determined by parallax of a few thousand light-years away. To measure further distances, we use other methods which you will learn in the coming classes.

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Define random error

Posted by Praveen Khavatkop 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Rrrrr Rrrrr 4 years, 9 months ago

statistical error that is wholly due to chance and does not recur —opposed to systematic error.

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Praveen Khavatkop 4 years, 9 months ago

The random error are those error, which occur irregularly and hence are random with respect to sign and size

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Anyone have idea that in physics which book has more weightage ? ..PART-1 OR PART-2 ? Means maximum questions will come from which part ?

Posted by Shreeya ? 4 years, 9 months ago

CBSE > Class 11 > Physics

5 answers

Aditya Chauhan 4 years, 9 months ago

Part 2 and part 1 ke kuch ch

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Uday Choudhary 4 years, 9 months ago

Part 2

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Abhishek Bharati 4 years, 9 months ago

From part 1 .. Total 40 marks will come from first book

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Priti Yadav 4 years, 9 months ago

Have 30 marks weightage

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Priti Yadav 4 years, 9 months ago

Part 2

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Hey I'm having my physics exam day after tomorrow and yet I've done nothing ( I know it's my fault ?, but what to do ) any suggestions ? to how can I prepare for my physics exam ?

Posted by Shreeya ? 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Nikki Singhal 4 years, 9 months ago

Keep this phone aside and put your whole focus on allthe formaulas and derivations If you even don't practice for numericals but make 100%sure that you can write all the theory well than you can score above 70 from 100 dear

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Shreeya ? 4 years, 9 months ago

Ok thanks I'll see ...well all the best to you ?

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a lift is accelerated upward. will the apparent wait of a person inside the lift increase, decrease or remain the same relative to its real weight ?what will happen to the apparent weight if the lift moves with uniform speed?

Posted by Harleen Grewal 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Karan Sharma 4 years, 9 months ago

Weight increase hoga

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Shivang Choudhary 4 years, 9 months ago

Weight will increase

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What is the function of physics?

Posted by Pearl ? 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Manjeet Sahu 4 years, 9 months ago

???????

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Friends kl mera exam h physics ??

Posted by Harsh Pandit 4 years, 9 months ago

CBSE > Class 11 > Physics

3 answers

Manjeet Sahu 4 years, 9 months ago

Koi chandigarh se h kya???

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Shreeya ? 4 years, 9 months ago

Harsh kaisa gya.? ...mera Wednesday ko hai !!

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Shreeya ? 4 years, 9 months ago

Harsh all the best mera English ka hai ✌️

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proof I=mr2

Posted by Kratika Patidar 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Harsh Pandit 4 years, 9 months ago

Sorry g

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Explain projectile motion

Posted by Alka Singh 4 years, 9 months ago

CBSE > Class 11 > Physics

4 answers

Raunak Chauhan 4 years, 9 months ago

When an object projected with some angle from the ground and allow to move under the influence of gravity ,then the motion possess by the object is called projectile motion

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Harsh Pandit 4 years, 9 months ago

When a body projected on a parabolic path then the motion of the body is parabolic ???

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Kratika Patidar 4 years, 9 months ago

Motion where an object moves in parabolic path, the object is called projectile and its motion is called projectile motion.

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Priyanshu Basu 4 years, 9 months ago

IF an object is thrown with some initial velocity and which is then allowed to move under the action of gravity is known as ?????????? ??????.

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