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Asked on 07 Jan IIT JEE/IIT - JEE Advanced/Physics/Thermal Physics

IF ratio of area of cross sections of a non uniform tube is 25,15,35 cm^2 then the ratio of velocities of fluid is read more

IF ratio of area of cross sections of a non uniform tube is 25,15,35 cm^2 then the ratio of velocities of fluid is 

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Lesson Posted on 11/12/2018 IIT JEE/IIT - JEE Mains/Physics/Rotational Motion

Energy Distribution 02

Parul P.

Teaching is my passion, I believe in holding classes in smaller batch so I can give more individual attention...

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Asked on 24/11/2018 IIT JEE/IIT - JEE Advanced/Mathematics/Trigonometry

If tan (x+y)/tan (x-y)= 2p+q/2p-q, then please find the value of 1-cos4x/1-cos4y?

Answer

Lesson Posted on 20/11/2018 IIT JEE/IIT - JEE Mains/Chemistry/Organic Chemistry/Chemistry in Everyday Life

Electronegativity

Sujeet Oza

Being close to current generation i understand the problems associated with traditional teaching methods...

One of the most important concept of Chemistry is Electronegativity. Concept of Electronegativity is useful from basic level questions to high level (IITJEE or NEET). So let us understand what is Electronegativity. It is defined as tendency of an atom to gain Electron. That means if an element is... read more

One of the most important concept of Chemistry is Electronegativity.

Concept of Electronegativity is useful from basic level questions to high level (IITJEE or NEET).

So let us understand what is Electronegativity.

It is defined as tendency of an atom to gain Electron.

That means if an element is more electronegative than other element then it will able to gain paired electron.

eg: In  CH3-Cl if bond fission takes place then electron will go towards Cl hence after bond fission negative charge will come on Cl and positive charge will come on CH3.

i.e. CH3-Cl ==> CH3+  &  Cl-

For solving question of IITJEE or NEET from this topic you need to memorise Electronegativity order given below

Order of Electronegativity:

F>O>N>Cl>Br>I>C>H>Metals.

Thankyou.

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Asked on 13/10/2018 IIT JEE/IIT - JEE Mains/Mathematics/Statistics and Probability

How to find students 

 

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Asked on 25/09/2018 IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth... read more

Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?

ncert-exemplar-problems-class-11-physics-chapter-5-work-energy-and-power-19 read less

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Asked on 25/09/2018 IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

A body is being raised to a height h from the surface of earth. What is the sign of work done by (a)... read more
A body is being raised to a height h from the surface of earth. What is the sign of work done by
(a) applied force and  (b) gravitational force? read less

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Asked on 25/09/2018 IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

A metre scale is moving with uiiiform velocity. This implies (a) the force acting on the scale is zero,... read more
A metre scale is moving with uiiiform velocity. This implies
(a) the force acting on the scale is zero, but a torque about the centre of mass can act on the scale.
(b) the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero.
(c) the total force acting on it need not be zero but the torque on it is zero.
(d) neither the force nor the torque need to be zero. read less

Answer

Lesson Posted on 24/09/2018 IIT JEE/IIT - JEE Mains/Physics/Kinematics CBSE/Class 11/Science/Physics CBSE/Class 11/Science/Physics/Unit 2-Kinematics/Chapter 4-Motion in a Plane +7 CBSE/Class 11/Science/Physics/Unit 2-Kinematics CBSE/Class 12/Science/Mathematics/Unit IV: Vectors and Three-Dimensional Geometry/Three-Dimensional Geometry Exam Coaching/CET Coaching/Mathematics Exam Coaching/CET Coaching/Physics Exam Coaching/Medical Entrance Coaching/NEET-PG Coaching Exam Coaching/Medical Entrance Coaching/AIPMT Coaching Exam Coaching/Medical Entrance Coaching/Others less

Dot Product of Vectors

Om Prakash Mishra

I am teaching Mathematics and Physics from past more than 12 years in coaching as well as home tuition...

Dot or Scalar Product of Vectors Dot Product of two vectors A and B is defines as product of magnitude of the vectors and cosine of the angle between them. A•B = |A||B|CosT, Where T is the angle between the vectors A and B. It is a scalar quantity Special Cases (I) If two vectors are perpendicular... read more

Dot or Scalar Product of Vectors

Dot Product of two vectors  A and is defines as product of magnitude of the vectors and cosine of the angle between them.

A•B = |A||B|CosT, Where T is the angle between the vectors A and B. 

It is a scalar quantity

Special Cases

(I) If two vectors are perpendicular to each other their dot product is Zero.

(ii) If two vectors and B are parallel their dot product is |A||B|.

If i, j, k are unit vectorsalong X, Y, Z axis respectively then 

i.i = 1

j.j = 1

k.k = 1

i.j = 0

j.k = 0

K.i = 0. 

 Note : Scalar product is commutative 

i.e. A.B = B.A

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Answered on 22/12/2018 IIT JEE

How many hours in a day should I study for IIT- JEE preparation? #AMA

Tarun KG

Teaching is an art of Inspiring & Igniting.

For IIT JEE, one need not to read in hours calcualtion, One should study as long as one enjoy the study. Generally 3 to 4 hrs of study apart form school study has been considred enough for a dedicated student.
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