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

Newton's third law states that there is always a reaction for every action in opposite direction and of equal magnitude i. e., action and reaction forces are equal and opposite. APPLICATIONS OF NEWTON'S THIRD LAW : ?recoil of gun ?walking of a person ?swimming in water

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A sphere of mass 40 kg is being attracted by another sphere of mass 80 kg with a force equal to 1/4 of a milligram weight when their centres are 30 cm apart. Calculate the value of G.

Posted by Vanshika Namdev 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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Why value of g in projectile motion in ground to ground always negative. Why it is not positive state reason?

Posted by Ankit Raj 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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If an object droped from an aeroplane then what will be the direction of object?projectile or vertical?

Posted by Sagar Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

7 answers

Sagar Singh 6 years, 3 months ago

Kiske compare m kaisa hoga ye bhi toh batao land pe jo peraon hoga uske liye projectile hoga or jo plane m baitha hoga uske liye verticle.

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Sagar Singh 6 years, 3 months ago

Ye answer's galat h

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Prakriti Ojha 6 years, 3 months ago

Projectile motion

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Krish Dey 6 years, 3 months ago

Projectile

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Sagar Singh 6 years, 3 months ago

This is not complete ans

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Sagar Singh 6 years, 3 months ago

Wrong

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Ankit Raj 6 years, 3 months ago

Projectile

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Explain unit vectors in 2 dimension coordinate system?

Posted by Jëľêņą Ğømēž 6 years, 3 months ago

CBSE > Class 11 > Physics

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a motor boat is racing towards north at 25km/h and the water current in that region is 10km/h in the direction of 60 degree east of south. find the resultant velocity of the boat

Posted by Mythili Nair G 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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The parallax of a heavenly body measured from two points dramatically opposite on equator of earth is 2.0 minutes. If radius of earth is 6400km, calculate distance of the heavly body

Posted by Jagabandhu Mishra 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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Range of gravitational force on earth

Posted by World Music 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Suman Singh 6 years, 3 months ago

What is phy

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Unit 2 motion in straight line how to find calxus methpd pf equation

Posted by Neha Khandwal 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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What is the advantage of friction

Posted by Kiran N 6 years, 3 months ago

CBSE > Class 11 > Physics

2 answers

Sagar Singh 6 years, 3 months ago

Without friction we are not able to write,walk,and byclining etc.

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Mehak Gautam 6 years, 3 months ago

Friction plays a vital role in our daily life. Without friction we are handicap. 1. It is becomes difficult to walk on a slippery road due to low friction. (move on ice too) 2. We can not fix nail in the wood or wall if there is no friction which holds the nail. 3. A horse can not pull a cart unless friction furnishes him a secure .

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A particle moves under the effect of a force F=Cx from x=0 to x=x1. The work done in thevprocess is [treat C as constant]

Posted by Laveena Chandnani 6 years, 3 months ago

CBSE > Class 11 > Physics

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Explain why a body is wightless during a free fall?

Posted by Vinay Punia 6 years, 3 months ago

CBSE > Class 11 > Physics

2 answers

Harender Singh 6 years, 3 months ago

Because Acceleration due to gravity is independent of mass of bodies

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Mehak Gautam 6 years, 3 months ago

The body isweightless during the free fall as there is no external contact force pushing or pulling upon their body. In each case, gravity is the only force acting upon the body

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Explain why constant pressure is greater than constant volume

Posted by Victorpaul Dokka 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Mehak Gautam 6 years, 3 months ago

The heat capacity at constant pressure is greater than the heat capacity at constant volume because when heat is added at constant pressure, the substance expands and work. QV = CV ∆T = ∆U + W = ∆ U as there no work is done.

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How to convert tan 27 and the steps

Posted by Cheasa Sangma 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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what is apparent weight during take off an astronaut whose actual weight is 750N

Posted by Divyansh Dewani 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Mehak Gautam 6 years, 3 months ago

Firstly, the mass of the astronaut is const. and before the take off his weight was , F = m × a . Then , as the rocket accelerates the acceleration of the astronaut becomes 5g + 1g = 6g . Hence, we can now simply find his apparent weight from that formula • F = m × a like that , F = 750N × 6g = 4500g

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If k. E of a body increase by 100 % how much % of momentum will increased

Posted by Deepak Kumar Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Mehak Gautam 6 years, 3 months ago

Kinetic energy = p^2/2m If the momentum increases by 100% , then the p increases to 2p. Substitute p =1 K before increase in momentum = p^2/2m = 1/2m - (1) K' after increase in momentum by 100% = 2p^2/2m= 4/2m - (2) Let p = 1 Divide (2) by (1) and substitute p=1 K'/K = (4/2m) / (1/2m) = 4 ( 2m gets divided by 2m to give 1) K'= 4K ( cross-multiplication) Percentage increase = (K'-K / K) * 100 = (4K-K/K) *100 = (3K /K) *100 = 3*100 = 300% When momentum of a body increases by 100% then its kinetic energy will increase by 300%.

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Diffrence between zero acceleration and constant acceleration

Posted by Nadeem Martin 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

Zero acceleration simply means there is no change in velocity with time and no change in velocity means neither its magnitude is changing nor the direction.Whereas constant acceleration say for example g=9.8m/s^2 shows the change in velocity with time (either its speed or direction). As an example when an object falls acceleration due to gravity is g in downward direction always , it acts because the speed of the freely falling object increases, direction being same though in this case ie downwards. Similarly when an object is thrown in vertical direction the speed decreases and eventually becomes zero at the topmost point and here also due to change in its speed acceleration g which is constant is there in downward direction.

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If someone has any doubt he or she can contact on Instagram id: prabh_singh_16

Posted by Prabh Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Robinpreet Kaur 6 years, 3 months ago

Same .PLEASE NIHAAL CAN YOU GIVE ANSWERS 9F MY QUESTIONS ON THIS APP

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Purvi Diwakar 6 years, 3 months ago

Same here

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Pawan Sidhu 6 years, 3 months ago

I have so many doubts sir but i have no instagram id

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A stone falls from a cliff and travels 24.5m in the last seconds before it reaches the ground at the foot of the cliff. Find the height of the cliff.

Posted by Prabh Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 6 years, 3 months ago

Explanation:

=> The total time taken by stone to fall from a cliff is suppose t then distance traveled in t seconds will be:

D_t = ut + 1/2 at²

D_t-1 = u(t-1) + 1/2 a(t-1)²

=> distance traveled in 1 sec less from total time thus, distance traveled in last second will be :

D_t - D_(t-1) = u + 1/2 a (2t - 1) = 24.5

1/2 * 9.8 *(2t - 1) = 24.5

as u= 0

t = 3 sec

=> height of cliff will be the total distance traveled during this time. Thus,

H = ut + 1/2 at²

= 0 + 1/2 * 9.8 * (3)²

= 44.1 m

Hence, the height of the cliff is 44.1 m.

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Important concepts of chapter7 System of particles

Posted by Harender Singh 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 6 years, 3 months ago

You can check on this
https://mycbseguide.com/cbse-revision-notes.html

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Please explain your answer

Posted by Sunil Kumar 6 years, 3 months ago

CBSE > Class 11 > Physics

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Please give answer of this question

Posted by Sunil Kumar 6 years, 3 months ago

CBSE > Class 11 > Physics

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A body travels 200 cm in first 2 second and 220 cm in next 4 seconds then calculate the velocity of the body at the end of seventh second from start?

Posted by Sunil Kumar 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Amisha Meena 6 years, 3 months ago

By 2nd equation of motion 20=u(0.2)+1/2a(0.2)^2 eq1 42=u(0.6)+3/2a(0.2)^2 eq2 On solving eq 1 and 2 a=1.5m U=115ms By 1 eq of no Motion V!=10ms

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si unit of distance

Posted by Girish Kumar 6 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Harender Singh 6 years, 3 months ago

SI unit of distance is metre and CGS is centimetre

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Amisha Meena 6 years, 3 months ago

Metre

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Sunil Kumar 6 years, 3 months ago

Metre

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write a cause of rolling friction

Posted by Akash Paul 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 6 years, 3 months ago

Rolling friction is caused due to the movement of wheels on any surface

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Dimensions of pressure

Posted by Rishi Aacharya 6 years, 3 months ago

CBSE > Class 11 > Physics

5 answers

Purvi Diwakar 6 years, 3 months ago

Welcome

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Hk Suman 6 years, 3 months ago

Dimension of pressure . P= Force / area =[ML-1T-2]

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Purvi Diwakar 6 years, 3 months ago

Ml -1 T -2

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Aditya Narayan Singh 6 years, 3 months ago

D of the force= MLT-2 & D of the area = L2 ::: # D of pressure = ML-1 T-2

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Rishi Aacharya 6 years, 3 months ago

Answer

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Explain partical application of capillarity

Posted by Shehila Nasreen 6 years, 3 months ago

CBSE > Class 11 > Physics

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When an alpin is held and pressed between finger the point hurts why?

Posted by Shehila Nasreen 6 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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How many unit in physics in half yearly

Posted by Sikandar Kumar 6 years, 3 months ago

CBSE > Class 11 > Physics

5 answers

Tannu Sharma 6 years, 3 months ago

Unnati I'm also in dav school

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Tannu Sharma 6 years, 3 months ago

Hamare school m to units and measurements, vectors motion in straight line, projectile, work power and energy, centre of mass half aaega

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Jassi Midha 6 years, 3 months ago

Only 5 chapters will come in govt. schools

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Unnati Pragya 6 years, 3 months ago

In my school BR DAV only 6 chapters were come

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Yash Goswami????? 6 years, 3 months ago

There are too many units in physics bro but don't worry learn them concept wise and u will easily get ur answer

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