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

Yes therw is a difference in them...In liquid bubble...there is only one film (i.e only one surface) but in soap bubble , it has 2 films(i.e double surface)...

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4 kg mass intially at rest and subjected to a force 16 N what is the aquired kinetic energy at the end of 10 sec

Posted by Anshika Kumari 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Aman Garg 6 years, 9 months ago

3200

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What what is the value of m director if a is equals to A=2i+3j-4k B=3i-mj+6k

Posted by Ayush Karamchandani 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Aman Garg 6 years, 9 months ago

-6

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How to find centre of mass? Derivation.

Posted by Diksha Soni 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

A Mittal 6 years, 9 months ago

Let in a system of many particles the co-ordinates of centre of mass of the system be (Xcm,Ycm,Zcm) then position vector of centre of mass would be Rcm=Xcmi+Ycmj+Zcmk (1) and position vectors of various particles would be EQ (2) Motion of centre of mass Differentiating equation 1 we get p is the vector sum of linear momentum of various particles of the system or it is the total linear momentum of the system. If no external force is acting on the system then its linear momentum remains constant. Hence in absence of external force In the absence of external force velocity of centre of mass of the system remains constant or we can say that centre of mass moves with the constant velocity in absence of external force. Hence from equation 18 we came to know that the total linear momentum of the system is equal to the product of the total mass of the system and the velocity of the centre of mass of the system which remains constant. Thus in the absence of the external force it is not necessary that momentum of individual particles of system like p1 , p2 , p3 . . . . . . . . . . . pn etc. remains constant but their vector sum always remains constant

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State and prove the Work energy theorem

Posted by Saurabh Mishra 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Nishant Verma 6 years, 9 months ago

Work done by all force equal to Change KE

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A Mittal 6 years, 9 months ago

According to Work - Energy theorem, work done by a net force in displacing a body is equal to change in kinetic energy of the body. s here is the displacement. Work done is given by v2 – u2 = 2as => as = ½ (v2 – u2 ) F = ma W = Fs => W = mas => W = ½m (v2 – u2 ) Work done increases the KE of the body KE = W => KE = ½m (v2 – u2 )

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Derive stokes formula dimintial analysis

Posted by Archana Kumari 5 years, 8 months ago

CBSE > Class 11 > Physics

1 answers

Meghna Sharma 6 years, 9 months ago

F=k(eta)a(vel.)b(radius)c [MLT(-2)]=[ML(-1)T(-1)]a [LT(-1)]b [L]c [MLT(-2)=[M(a)] [L(-a+b+c)] [T(-a-b)] Now solve for the powers in M,L,T......

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A ball bounce 89%of its original height calculate the change in its momentum

Posted by Ritika Ram 6 years, 9 months ago

CBSE > Class 11 > Physics

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Derive an expression for the acceleràtion of a partical executing

Posted by Ajay Ajay 6 years, 9 months ago

CBSE > Class 11 > Physics

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Tell me important topics of class11 physics

Posted by Ankita Kumari 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Meghna Sharma 6 years, 9 months ago

Bernoulli's theorem, Stoke's law of viscosity, parallax method, types of flows, dopler effect numerical, position time graph, types of forces with numerical, difference between reflection and refraction, carnot, efficiency, refrigerator principle, equation of continuity, significance of moment of inertia, first law of thermodynamics, ascent formula, banking of roads, expression of excess pressure, correctness of formula, collisions, degree of freeedom, simple pendulum.

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Sagar Pandya 6 years, 9 months ago

Themodynamics Oscillation System of Particles and Rotational motion Motion in a plane Gavitation Mechanical properties of fluids Motion in a straight line Laws of motion Waves Work energy and power

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G g variation

Posted by Dheeraj Singh 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Meghna Sharma 6 years, 9 months ago

G = universal gravitational constant, 6.67×10^-11Nm^2/kg^2 g= acceleration due to gravity, 9.8 m/sec^2 on the earth's surface. g=GM/r^2

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Samya Parmar 6 years, 9 months ago

G is universal constant whose value is 6.67×10^-11 And g is acceleration due to gravity

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Max value of shm

Posted by Komal Candir 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Aashir Arham ⚽?⚽ 6 years, 9 months ago

Kinetic energy should be max and hence potential energy should be minimum. At the mean position of the SHM the velocity is maximum.

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Meghna Sharma 6 years, 9 months ago

Don't know ?

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Explain kinetic interpretation of temperature?

Posted by Macherla Indupriya 6 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

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What's monochromatic radiation??

Posted by Meghna Sharma 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Aashir Arham ⚽?⚽ 6 years, 9 months ago

Only one frequency or wavelength that is monochromatic radiation.

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A Mittal 6 years, 9 months ago

There are two types of light or radiation, monochromatic and dichromatic.Monochromic radiation is the radiation which consist of single wavelength.

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What is doplers effect

Posted by Roushan Kishor 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Meghna Sharma 6 years, 9 months ago

According to it, whenever there is a relative motion between a source of sound, the listener and the intervening medium, the apparent frequency of sound heard by the listener is different from the actual frequency of sound emitted by the source.( Its reverse is also true).

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A Mittal 6 years, 9 months ago

It is a wave phenomenon in which their is a apparent change in frequency (pitch) due to relative motion between source, listener (observer) and medium

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A body starting from rest accelerates uniformly along a straight line at the rate of 10m/s square for 5 seconds .It moves for 2 secs with uniform velocity of 50m/s .Then it retards uniformly and comes to rest in 3 secs .Draw v-t graph of the body and find the total distance travelled by the body

Posted by Kishore Kumar Das Mohapatra 6 years, 9 months ago

CBSE > Class 11 > Physics

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The spring constant of the spring shown in figure is250n/m. Find maximum compression of the spring

Posted by Sidhi Dadhich 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Nishant Verma 6 years, 9 months ago

Fig??

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.Estimate the rate at which ice melts in a wooden box 2 cm thick of inside measurements 200x120x120 cm.assuming that the external temperature is 300 c and conductivity of wood is 0.0004 cgs

Posted by Sandip Saini 6 years, 9 months ago

CBSE > Class 11 > Physics

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What is the geometrical meaning of dot product and cross product of vectors?

Posted by Dhrub Kumar 6 years, 9 months ago

CBSE > Class 11 > Physics

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Two projectiles p and q are thrown with the same speed but the angle of projections are 30°and 60° respectively with the horizontal. Which will fall earlier.. Pls answer my question.

Posted by Ilma Ali 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Priyal Bansal 6 years, 9 months ago

Since time =usinø/g ..u and g are same so t is directly propotional to sinø so at 30° it will reach earlier

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State the type of motions in case of a nail being drilled in a wall with a wrench.

Posted by Ilma Ali 6 years, 9 months ago

CBSE > Class 11 > Physics

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Guys .....can u please tell me weightage of all chapters of physics...including ray optics

Posted by Kritika Joshi 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Kritika Joshi 6 years, 9 months ago

But the total marks are 60...here nd actually paper will be of 70 marks...I guess

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Priya Dharshini ? 6 years, 9 months ago

Ray optics 8 marks,fluids 5 marks,solids is 3 marks gravitation 5 marks,units and measurement 5 marka,oscillation and wave 9 marks,laws of motion 5 marks,thermo and ktg is 4 marks each, rotational motion is 7 marks,work is 5 marks...

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State and explain coulcmb's low in dielectric const .

Posted by Ashish Sable 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Nishant Verma 6 years, 9 months ago

12...k h

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Meghna Sharma 6 years, 9 months ago

https://goo.gl/search/Coulomb's+law Coulomb's law,

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Find mirror formula

Posted by Jagpal Singh 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Shatayu Ganvir 6 years, 9 months ago

1/v+1/u = 1/f

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I want all chapters marks weight age

Posted by Rahul Semwal 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

A Mittal 6 years, 9 months ago

Units And marks Given Below :- I.- Physical World & Measurement : 03 II.- Kinematics : 10 III.- Laws of Motion : 10 IV.- Work, Energy & Power : 06 V.- Motion of System of particles & Rigid Body : 06 VI.- Gravitation : 05 VII- Properties of Bulk Matter : 10 VIII -Thermodynamics : 05 XI -Behaviour of Perfect Gas & Kinetic Theory of gases: 05 X- Oscillations & Waves : 10 Total : 70

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What is nature of force

Posted by Muskan Awasthi 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Kunjali? Verma 6 years, 9 months ago

Attractive and repulsive

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Find the dimensions of a/b in the relation v=a+bt, where v is velocity, t is time and a and b are constants.

Posted by Divyanshu Tripathi 6 years, 9 months ago

CBSE > Class 11 > Physics

3 answers

Nishant Verma 6 years, 9 months ago

Compare v=u+at and you will get answer.

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Aman Kumar 6 years, 9 months ago

Ok....wait we have to find (a/b)...then.answer is T....and if we have to find separately (a) and (b) then the answer is (a):-LT^-1 and (b):- LT^-2

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Aman Kumar 6 years, 9 months ago

We have to find.....(a/b) ....ya ( a ) and ( b )

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Derive the position vector of centre of mass

Posted by Gravit Ningombam 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Meghna Sharma 6 years, 9 months ago

What a answer ???

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Thanks We 6 years, 9 months ago

मंगलवार को भारत ने पाक के ऊपर सर्जिकल स्ट्राइक कर दी जिसके बाद दोनों देशों के बीच काफी तनाव तनाव हो गया है इस तनाव के बावजूद भी पाकिस्तान को भारत के वीर सपूत विंग कमांडर अभिनंदन को मजह 59 घंटों के बाद ही भारत को सौंपना ही पड़ा। शुक्रवार रात 9.21 बजे वतन लौटने के साथ ही अभिनंदन के शौर्य की कहानी भारतीय सेना के इतिहास में अमर हो गई। अभिनंदन जब लौटे तो उनके चेहरे और हावभाव को देखकर साफ दिख रहा था कि उन्होंने पाकिस्तान को भारत के साहस का परिचय बखूबी करा दिया है। वह नीला कोट, ग्रे पैंट और सफेद शर्ट पहने हुए थे।

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Si unit of electric current

Posted by Sameer Maniyar 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Samya Parmar 6 years, 9 months ago

Ampere

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Yogita Ingle 6 years, 9 months ago

The electrical current in basic term is the flow of electric charge.
The SI unit of electric current is Ampere (A), 1 ampere is the amount of current when there is a flow of 1 coulomb of charge passing through a cross section in 1 second.

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A jet plane makes a horizontal loop with velocity 900 km/h find the radius of the loop if the wings of the jet are blanked at 10 degree

Posted by Varun Sharma 5 years ago

CBSE > Class 11 > Physics