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

Physical fitness is to the human body what fine tuning is to an engine. It enables us to perform up to our potential. Fitness can be described as a condition that helps us look, feel and do our best. ● Physical fitness involves the performance of the heart and lungs, and the muscles of the body.

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Covid 19 is which type of virus?

Posted by Chehak .. 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Sahil Malik 4 years, 4 months ago

Coronaviruses are a large family of viruses that are known to cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS).

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Chapter 13 table 13.1 solution

Posted by Creative Garvit 4 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Aarohi Singh 4 years, 3 months ago

Which subject

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Law of attraction...

Posted by Chehak .. 4 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Prateek .. 4 years, 4 months ago

Hope u understand.

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Prateek .. 4 years, 4 months ago

It is the belief that positive and negative thoughts bring positive and negative experiences into a person's life.

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What is quantum theory ???

Posted by Kha Gay Mella Sara Purana Yaall ☹️??? 4 years, 4 months ago

CBSE > Class 11 > Physics

5 answers

Chehak .. 4 years, 4 months ago

describes physical properties of nature on an atomic scale..... Welcome bro ?

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Ankit Singh Thakur???? 4 years, 4 months ago

Welcome yar purana

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Kha Gay Mella Sara Purana Yaall ☹️??? 4 years, 4 months ago

Thanks bro ??

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Ankit Singh Thakur???? 4 years, 4 months ago

This your answer Yaar purana

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Ankit Singh Thakur???? 4 years, 4 months ago

Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model and matrix mechanics), part of quantum field theory, is a fundamental theory in physics. It describes physical properties of nature on an atomic scale.

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2nd law of motion... Derivation?

Posted by Chehak .. 4 years, 4 months ago

CBSE > Class 11 > Physics

5 answers

Ankit Singh Thakur???? 4 years, 4 months ago

Welcome sister

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Chehak .. 4 years, 4 months ago

No need for sorry... Vaise i know u

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Chehak .. 4 years, 4 months ago

Thnx..ankit

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Ankit Singh Thakur???? 4 years, 4 months ago

Oh sorry ananya sharma this is your answer

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Ankit Singh Thakur???? 4 years, 4 months ago

This statement is expressed in equation form as, a=Fnetm The above equation can be rearranged to a familiar form as F=ma Since force is a vector, Newton’s second law can be written as F⃗ =ma⃗ The equation shows that the direction of the total acceleration vector points in the same direction as the net force vector. Deriving Newton’s Second Law Force is equal to the rate of change of momentum For Changing Mass Let us assume that we have a car at a point (0) defined by location X0 and time t0. The car has a mass m0 and travels with a velocity v0. After being subjected to a force F, the car moves to point 1 which is defined by location X1 and time t1. The mass and velocity of the car change during the travel to values m1 and v1. Newton’s second law helps us determine the new values of m1 and v1 if we know the value of the acting force. Taking the difference between point 1 and point 0, we get an equation for the force acting on the car as follows: F=m1v1−m0v0t1−t0 Let us assume the mass to be constant. This assumption is good for a car because the only change in mass would be the fuel burned between point “1” and point “0”. The weight of the fuel is probably small relative to the weight of the rest of the car, especially if we only look at small changes in time. Meanwhile, if we were discussing the flight of a bottle rocket, then the mass does not remain constant and we can only look at changes in momentum. For Constant Mass For a constant mass, Newton’s second law can be equated as follows: F=mv1−v0t1−t0 We know that acceleration is defined as the change in velocity divided by the change in time. The second law then reduces to a more familiar form as follows: F=ma The above equation tells us that an object will accelerate if it is subjected to an external force and the amount of force is directly proportional to the acceleration and inversely proportional to the mass of the object. What is a Net Force? A net force ΣF is the sum of all forces acting on a body. More precisely, it is the vector sum of all forces acting on a body. Calculating the net force acting on a horse Consider two forces of magnitude 30 N and 20 N that is exerted to the right and left respectively on the horse shown in the picture. If we assume the rightward direction as positive, then the net force on the horse can be calculated as follows: ∑F=30N−20N=10N ∑F=10Ntotheright

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Quantum number?

Posted by Chehak .. 4 years, 4 months ago

CBSE > Class 11 > Physics

5 answers

Chehak .. 4 years, 4 months ago

Ananya yadav? I m not ananya yadav... I m ananya sharma

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Ankit Singh Thakur???? 4 years, 4 months ago

Welcome sister

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Chehak .. 4 years, 4 months ago

Thnx ankit

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Ankit Singh Thakur???? 4 years, 4 months ago

This your answer ananya yadav

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Ankit Singh Thakur???? 4 years, 4 months ago

a number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values.

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how,a vector quantity can be represented graphically?

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

3 answers

Sahil Malik 4 years, 4 months ago

I am gud ND you

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Chehak .. 4 years, 4 months ago

Vectors can be represented graphically as arrows. The length of the arrow indicates the magnitude of the vector. The direction of the arrow indicates the direction of the vector. ... When two vector quantities are added, the two arrows that represent the quantities are joined tip-to-tail.

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Chehak .. 4 years, 4 months ago

Hi... Kaise ho sona... Snehil kaisa h

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A body moving with uniform acceleration describes 20m in 2nd and 30 m in 4th second of its motion . Calculate the distance moved by its 6 second

Posted by Surbhi Suman 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 4 years, 4 months ago

Given,

distance covered in 2nd s = 20 m

distance covered in 4th s = 30 m

We know,

Snth = u + a(2n - 1)/2

=> S2nd = u + a(2*2 - 1)

=> 20 = u+ 3a/2

=>20 = (2u+3a)/2

=>40 = 2u + 3a ------------- (1)

Again,

S4th = u + a(2*4 -1)/2

=>30 = u + 7a/2

=>30 = (2u + 7a)/2

=>60 = 2u + 7a --------------(2)

(1) - (2)

=>2u + 3a -2u -7a = 40 - 60

=> -4a = -20

=>a = 5

Putting the value of a in eq (1), we get,

=>2u + 3(5) = 40

=>2u = 40 -15

=>u = 25/2

Now,

S6th = u+ a(2n -1)

=>S6th = 25/2 + 5(2*6 -1)/2

=>S6th = 25/2 + 5*11/2

=>S6th = 25/2 + 55/2

=>S6th = 80/2

=>S6th = 40

Hence , distance covered in the 6th s = 40 m

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Two resistance r1=200+–4ohm and r2=+—3ohm are connected in series find the equivalent resistance

Posted by Shivam Dwivedi 4 years, 4 months ago

CBSE > Class 11 > Physics

0 answers

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definitions polar vector and Axial vector

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

5 answers

Usha Goswami 4 years, 4 months ago

Polar vector A vector quantities whose direction is along the direction of the motion of a body or particle is known as polar vector E.g: displacement, velocity etc Axial vector A vector quantities whose direction is along the direction of rotation of the body or particle E g: angular acceleration,torque etc

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Sahil Malik 4 years, 4 months ago

Only 3 marks

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Chehak .. 4 years, 4 months ago

Kitine marks acc. ?

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Sahil Malik 4 years, 4 months ago

سهل

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Sahil Malik 4 years, 4 months ago

can anyone's give me a easy definitions

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explain the additions of two collinear vector. Also define resultant vector?

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

0 answers

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how, a vector quantity can be represented graphically ?

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

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define unit work. write the absolute unit of work in in (i) CGS system and (ii) SI system. show that 1 joule is equal to 10 raise to power 7erg.

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Meghna Thapar 4 years, 4 months ago

The SI unit of work is the joule (J), which is defined as the work expended by a force of one newton through a displacement of one metre. Absolute units: (i) SI System - Joule is the unit of work in SI system. ... (ii) CGS system – CGS unit of work is erg. Work done is said to be 1 erg if a force of one dyne displaces the body by 1 cm in the direction of force applied.

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the Bomb thrown in a horizontal direction with a velocity of 50 metre per second it explodes into two parts of masses 6 kg and 3kg the heavier fragment continue to move in the horizontal direction with a velocity of 40 metre per second calculate the velocity of the lighter fragment ? how can we solve ......Is answer .....70m/s.

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Ã.P.W.B.Đ ⚡ 4 years, 4 months ago

Yes answer is 70m/s It is to be solved by applying law of conservation of momentum.

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can anyone give me a important questions off chapter 4 physics plz!!!!!!!!!!!!!!!

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

0 answers

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write a rank relation between linear acceleration and angular acceleration. what is the value of angular acceleration if angular velocity of a particle is zero?

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

0 answers

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discuss properties of cross product of two vectors?

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

0 answers

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what is the angle of projection at which horizontal range and maximum height are equal?

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

M. Ramachandran 4 years, 4 months ago

45 degrees

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How we will able to determine the size of astronomical unit of diameter of a moon or a planet ?

Posted by Vaishnavi Thakur 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Meghna Thapar 4 years, 4 months ago

The astronomical unit (symbol: AU) is a unit of length, roughly the distance from Earth to the Sun and equal to about 150 million kilometres (93 million miles). However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. The most common is to measure the apparent angular diameter of the planet – how big it looks against the sky – very precisely using a telescope. Combining this with a measure of its distance (deduced from its orbit around the Sun) reveals the planet's actual size.

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How is your study going.physics samjhne ke liye s.chand. samajhne ke baad H C Verma is best book .

Posted by Bhushan Lal Sahu 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Bhushan Lal Sahu 4 years, 4 months ago

Of course

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what is trajectory of a projectile

Posted by Sahil Malik 4 years, 4 months ago

CBSE > Class 11 > Physics

4 answers

Sahil Malik 4 years, 4 months ago

Stu ??

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Seraj Ali ????? 4 years, 4 months ago

????

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Seraj Ali ????? 4 years, 4 months ago

Hey sona happy FRIEND ship day ??

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Numendra Kumar Pandey 4 years, 4 months ago

Y=Xtana - gx^2/u^2 2cos2a

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Dicuss the motion of an object under free fall . Neglect air resistance. Please answer fast

Posted by Adya Jha 4 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Priyanshu Kumar Priyanshu Kumar 4 years, 4 months ago

Love you

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Numendra Kumar Pandey 4 years, 4 months ago

Under free fall object falls due to attraction force of gravity from the core of the earth . a=+g

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avector=2icap+3icap+5icap,bvector=6icap+2icap-kicap then find out avector.bvector

Posted by Deola Soren 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Numendra Kumar Pandey 4 years, 4 months ago

2×6+3×2+5×(-1) = 12+6-5 =13

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which book is best and i should buy for physical education????

Posted by Shreya S❤ 4 years, 4 months ago

CBSE > Class 11 > Physics

5 answers

Shreya S❤ 4 years, 4 months ago

thanks ankit

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Shreya S❤ 4 years, 4 months ago

dhruv ro kyu rha h ,, harshit is fine ,, he is serious somewhat ,,,,,

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Ankit Singh Thakur???? 4 years, 4 months ago

Shreya vk sharma is best book for physical education l hope this will help you

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Dhruv .. 4 years, 4 months ago

Aur studies kaisi chal rahi..tumhari✌️✌️aur harshit kaisa hai?

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Dhruv .. 4 years, 4 months ago

????

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Anyone help me to get in physics notes of all chapter my friends help me please

Posted by Ankit Singh Thakur???? 4 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Bhushan Lal Sahu 4 years, 4 months ago

Pehle aapko physics pe click karna hai then aapko niche chapters me click karna hai uske baad aapko (cbse revision notes) mil jayenge .

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What is CGS system

Posted by Sstylish Ravi 4 years, 4 months ago

CBSE > Class 11 > Physics

3 answers

Anjali Varshney 4 years, 4 months ago

CGS- Centimetre Gram Second

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Samarth Gupta 4 years, 4 months ago

CGS system is the system in which we measure length into centimetre mass into gram and time into second.

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Lehar Toksia 4 years, 4 months ago

It's centimeter, gram and second system

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Difference btw speed and velocity

Posted by Mohd Mujtaba 4 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Anjali Varshney 4 years, 4 months ago

SPEED - The rate of change of position with time ... VELOCITY -The rate of change of displacement of an object in a particular direction...

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Yogita Ingle 4 years, 4 months ago

Sl. No.	Differentiating Property	Velocity	Speed
1	Definition	Velocity can be defined as the rate at which an object changes position in a certain direction.	The rate at which an object covers a certain distance is known as speed.
2	Type of quantity	Vector quantity	Scalar quantity
3	Magnitude	Velocity can be zero, negative, or positive.	Speed can never be negative or zero.
4	Change of direction	The velocity of the object changes with the change in direction, therefore the object must follow one direction.	The average speed will continue to count even if the object change direction.
5	Interrelation	An object may possess different velocities but the same speed.	Speed may or may not be equal to velocity.
6	Unit (SI)	Velocity is measured in m/s	Speed is measured in m/s

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