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

I m not sure about this but u can check it :- Newton third law is correct but in case of a lift ( we know, N=mg) when it is moving upward then N= mg+MA (the mass of the object inside it)... That's why Nissan greater then downward weight.... If wrong then correct me..

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Obtain the expression of conservation of linear momentum from newton's third law of motion

Posted by Himanshu Kumar 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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relation between k.E and momentum

Posted by Shivansh Shukla 7 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Gaurav Singh 7 years, 3 months ago

v=p/m...1 andKe =1/2 mv2 ....2 so from 1 and 2K=1/2 m(p/m)2=p2/2m...3 is the desired relation.

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Why third law of motion is called as real law of motion?

Posted by Navneet Krishnan 7 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Navneet Krishnan 7 years, 2 months ago

It is right but it is five marks question???

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Khushi Jangir 7 years, 3 months ago

Second law is called real law of motion becoz both laws ,first &third are proved by it.

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Rishabh Kumar Jha 7 years, 3 months ago

Because it contains 2nd law and 3rd law of motion

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How to study physics in class 11

Posted by Puneet Kumar 7 years, 3 months ago

CBSE > Class 11 > Physics

4 answers

Ritik Gupta 7 years, 3 months ago

See video from physics walleh

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Nancy Rajput 7 years, 3 months ago

clear your whole concept and understand the derivation

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Gaurav Singh 7 years, 3 months ago

But some terms are bit difficult to understand

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Aman Kumar 7 years, 3 months ago

Just study it by clearing all ur concept

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Birds swell their feathers in winter. Why?

Posted by Khushi Jangir 7 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 3 months ago

coz air is a bad conductor of heat., It does not allow the body heat 2 escape. This keeps the birds warm...

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Rain is falling vertically with a speed of 30m/s .A woman rides a bicycle with a speed of 10m/s in north to south direction. What is relative velocity of rain with respect to the woman? What is the direction in which she should hold her umbrella to protect herself?

Posted by Khushi Jangir 7 years, 3 months ago

CBSE > Class 11 > Physics

3 answers

Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 3 months ago

relative velocity of rain with respect to womain =10j -30k...... nd umbrella should be put by woman in South to above direction at an angle = tan^-1( 1/3)

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Khushi Jangir 7 years, 3 months ago

Can anyone give me answer?

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Aman Kumar 7 years, 3 months ago

May be ur answer is :- .........angle= tan^-1(1/3)

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prove that the coefficient of static friction is equal to the tangent of the angle of friction?

Posted by Tirthajit Patra 7 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Khushi Jangir 7 years, 3 months ago

F=mgSin thita &R =mg cos thita .coefficient of friction =F/R ,it results ,coefficient of friction =sin/cos=tan thita

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Find the expression of maximum velocity of a vehicle for a banked road.

Posted by Saranga Borah 7 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Khushi Jangir 7 years, 3 months ago

V=gr(sin thita+mue cos thita)÷(cos thita -mue sin thita ). The whole expression is under root.

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If a car is going towards north in velocity 50km/h and takes a left turn making 90°.What is change in velocity of the car?

Posted by Nayan Choudhury 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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What all topics are important in physics??

Posted by Naina Khan 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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Explain Torricelli experiment for measuring atmospheric pressure

Posted by Komal Mehta 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

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In derivations of horizontal and vertical projection of projectile. why we take g as -g??

Posted by Gurjinder Kaur 7 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Aman Kumar 7 years, 3 months ago

We know that if throw a ball upward then g should be negative..... Similarly in case of vertical and horizontal projection we always see the initial g which is negative. But for horizontal case, g along x-axis=o...

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The range of a rifle bullet on level ground is 6000m l. The range at an incline of 30degree will be: 4000m 2000m 6000m 1000m

Posted by Aditya Wagh 7 years, 3 months ago

CBSE > Class 11 > Physics