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

The kilogram is the base unit of mass in the metric system, formally the International System of Units, having the unit symbol kg. It is a widely used measure in science, engineering, and commerce worldwide, and is often called a kilo. The kilogram is almost exactly the mass of one litre of water. Wikipedia 1 kg in: is equal to Unit system: SI base unit Unit of: Mass Symbol: kg British Gravitational: ≈ 0.0685 slugs

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What is rest mass??

Posted by Anirudh Sharma 6 years, 5 months ago

CBSE > Class 11 > Physics

0 answers

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a projectile is thrown one base of triangle at an angle of theta.it touches the vertex and false on other base of triangle, if the base angle are theta 1 and theta 2,then show that, tan theta =tan theta 1 + tan theta 2

Posted by Vishal Kumar 6 years, 5 months ago

CBSE > Class 11 > Physics

0 answers

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What is relative velocity and resultant

Posted by Shubham Joshi 6 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Yogita Ingle 6 years, 5 months ago

Relative Velocity

This is the velocity of an object relative to some other object which might be stationary, moving slowly, moving with same velocity, moving with higher velocity or moving in opposite direction.

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Edzio Assasin 6 years, 5 months ago

I dont know

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A passenger sitting in a car at next, pusher the car from within.the car doesnt move,why?

Posted by Shivam Pandey 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Deepika Bhattoo 6 years, 5 months ago

The car doesn't move because 'push' is an internal force.

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SI unit for force

Posted by Dheeraj Kumar 6 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

Nidhi Sharma 6 years, 5 months ago

Sorry, newton

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Nidhi Sharma 6 years, 5 months ago

(?)=dumbled shape

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Shubham Joshi 6 years, 5 months ago

Newton n

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Unnati Pragya 6 years, 5 months ago

Mass x acc (MLT-2) T miuns 2to the power it's Also newton never write Newton otherwise ur marks may be cut in exam

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Deepak Kumar 6 years, 5 months ago

Newton

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what is phyise ?

Posted by Mahbuba Choudhury 6 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Adarsh Singh 6 years, 5 months ago

Physics is a natural. Science which deal with concept of natural environment etc

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Aditya Narayan Singh 6 years, 5 months ago

Physics is a natural science

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What is themodynamics

Posted by Aark Ojha 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Yadav 6 years, 5 months ago

Thermodynamics deals with the change in internal energy , temperature, entropy etc. Of macroscopic quantities through external and heat

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Is here present exercise for dimensions formula

Posted by Deepak Yadav 6 years, 5 months ago

CBSE > Class 11 > Physics

0 answers

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What is means by instrumental errors

Posted by Kamal Deep Singh 6 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Aman Sura 6 years, 5 months ago

The error which is produce by instrument

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Yash Goswami????? 6 years, 5 months ago

Errors that occir due to fault in measuring instrument is known as instrumental error....

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the maximum vertical height of a projectile is 10 metre if magnitude of the initial velocities 28 metre per second what is the direction of initial velocity

Posted by Piyush Pandey 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Ranjeet Kumar 6 years, 5 months ago

maximum height,h_m=10m Initial velocity,v_0=28 m/s Now,h_m = {(v_0 sinθ_0)^2}/2g Or,10 = {(28sinθ_0)^2}/20 Or,(200)^1/2 = 28sinθ_o Or,sinθ_ο ={14.14}/28 Or,θ_ο = asin[0.5] = 30° The projectile is projected at an angle of 30° with the horizontal. (NOTE: asinx is another notation for sin inverse x).

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Notes of chapter 2

Posted by Priyanshu Mishra 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 6 years, 5 months ago

Check revision notes here : https://mycbseguide.com/cbse-revision-notes.html

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What is means by significant error

Posted by Kamal Deep Singh 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Ashwani Kr 6 years, 5 months ago

Significant figures. Whenever you make a measurement, the number of meaningful digits that you write down implies the error in the measurement. For example if you say that the length of an object is 0.428 m, you imply an uncertainty of about 0.001 m

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Systematic error

Posted by Kamal Deep Singh 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 6 years, 5 months ago

Systematic error is an error having a non-zero mean, so that its effect is not reduced when observations are averaged.

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Guys tum logo ke exam kb se start ha

Posted by Jay Chandra 6 years, 5 months ago

CBSE > Class 11 > Physics

6 answers

Jay Chandra 6 years, 5 months ago

Mere tho aug ma ha

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Jay Chandra 6 years, 5 months ago

Ittni jaldi

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Shubham Joshi 6 years, 5 months ago

22 july

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Ankush Upadhyay 6 years, 5 months ago

22 july 2019

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Aditi Shukla 6 years, 5 months ago

29 july

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Aastha Singh 6 years, 5 months ago

22 july 19

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Why is physics important for us??

Posted by Komal Kashyap 6 years, 5 months ago

CBSE > Class 11 > Physics

5 answers

Yash Goswami????? 6 years, 5 months ago

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Yash Goswami????? 6 years, 5 months ago

No! Gyus physics is important to get good marks and % in 12th board examinations

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Tanya Zanzad 6 years, 5 months ago

Good question..... Physics is important becoz it teaches us working of nature and it's component.... As maths is also important to us becoz it's language of physics

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Piyush Gautam.. 6 years, 5 months ago

Yes..its correct..

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Yuvika Gupta 6 years, 5 months ago

Physics isimportant because physics is the study of nature

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What are co-Planar vectors

Posted by Aanchal Rastogi 6 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Sia ? 6 years, 5 months ago

Vectors parallel to the same plane, or lie on the same plane are called coplanar vectors.

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Yash Goswami????? 6 years, 5 months ago

Vectors which lies on same plane are known as co planner vectors

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What is vector rule

Posted by D J 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Ashwani Kr 6 years, 5 months ago

Vector addition is the operation of adding two or more vectors together into a vector sum. The so-called parallelogram law gives the rule for vector addition of two or more vectors. For two vectors and , the vector sum is obtained by placing them head to tail and drawing the vector from the free tail to the free head.

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Please explain how to find instantaneous velocity ....with example

Posted by Dipti Singh 6 years, 5 months ago

CBSE > Class 11 > Physics

4 answers

Yash Goswami????? 6 years, 5 months ago

Easy way to find out instantaneous velocity is to do differentiation of dispacement witch respect to time that is: V=dx/dt

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Ranjeet Kumar 6 years, 5 months ago

Instantaneous velocity is a useful tool to determine velocity at any point or any time for a body in non uniform motion.For example, average velocity in a fixed time interval is given by,<v> = Δχ/Δt where Δχ is the distance covered in time interval Δt.When Δt becomes infinitesimaly small,it gives the instantaneous velocity.Or, v = limΔt->0 Δχ/Δt = dx/dt by language of calculus.Now, let the displacement of a body with respect to time is given by x = t^2+2t+1.To determine the velocity at 4s, we have to determine the value of the deriviative of x w.r.t. t at t=4.Or, v(4)= [d(t^2+2t+1)/dt ]_4=[2t+2]_4 =10 m/s.

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Yuvika Gupta 6 years, 5 months ago

Sorry it will be dx /dt

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Yuvika Gupta 6 years, 5 months ago

By differentiating the function of position Eg- let x = 4t^2+3t+4 then velocity = dy/dx(4t^2+3t+4) = 8t+3. And time will be most probably provided in the question.

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In a parallelogram ABCD prove that AC vector + BD vector =2BC Vector

Posted by Manshi Panwar 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Yash Goswami????? 6 years, 5 months ago

Broo...... just use parallelogram law of addition and solve it and you will confirmly get the answer......

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P=F/A

Posted by Ujjval Pareek 6 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Yash Goswami????? 6 years, 5 months ago

You r absolutely right bro...

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Ashwani Kr 6 years, 5 months ago

https://images.app.goo.gl/6iuWiRUzvjmzq2SVA

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What is the resultant of a vector cross b vector

Posted by ?? ??? 6 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Ranjeet Kumar 6 years, 5 months ago

A^-> × B^-> = AB sinθ n^ where n^ is a unit vector perpendicular to both A^-> and B^->, and θ is the angle between A^-> and B^->. The resultant of cross product or vector product of two vectors is itself a vector, representing a right handed system.

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What is prototype metre

Posted by Taneya Gupta 6 years, 5 months ago

CBSE > Class 11 > Physics

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Relation between parsec and light year

Posted by Lalit Singh 6 years, 5 months ago

CBSE > Class 11 > Physics

2 answers

Sia ? 6 years, 5 months ago

A parsec is equal to about 3.26 light-years(31 trillion kilometres or 19 trillion miles) in length.

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Yogita Ingle 6 years, 5 months ago

A light year is the distance covered by light in one year at the speed of 300,000 kilometres per second.
A parsec is the short of parallactic second,it is an astronomical unit of length used to measure distances to objects outside the solar system.
It is the distance at which an arc of length one astronomical unit subtends an angle of one second of an arc.
1 parsec= 3.26163626 light years
1 light year = 0.30659458 parsec.

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Experiment of manual book

Posted by Rohan Munenni 6 years, 5 months ago

CBSE > Class 11 > Physics

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two bullets are fired with the horizontal velocity of 50 metre per second square metres per second from two guns at a height of 19.6 metre the strike the ground

Posted by Ruchin Panwar 6 years, 5 months ago

CBSE > Class 11 > Physics

0 answers

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What is the dimension of force

Posted by Shivam Punia 6 years, 5 months ago

CBSE > Class 11 > Physics

3 answers

Rashmeet Singh 6 years, 5 months ago

MLT is the power -2 inverse

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Sia ? 6 years, 5 months ago

The dimension of force is [MLT⁻²]

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Yogita Ingle 6 years, 5 months ago

The dimension of a physical quantity is defined as the powers to which the fundamental quantities are raised in order to represent that quantity. The seven fundamental quantities are enclosed in square brackets [ ] to represent its dimensions.

<pre> Force applied on a body is the product of acceleration and mass of the body</pre>

Force = Mass × Acceleration

Dimension of Mass = [M]

Dimension of Acceleration = [LT^-2]

Dimension of Force will be = [M] × [LT^-2]

[Force] = [MLT^-2]

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Name and type of errors

Posted by Prakash Tripathi 6 years, 5 months ago

CBSE > Class 11 > Physics