Signup as a Tutor

As a tutor you can connect with more than a million students and grow your network.

IIT JEE

Trending Questions and Lessons

Follow 7 Followers

Ask a Question

Feed

All

All

Lessons

Discussion

Lesson Posted on 06 Feb IIT JEE/IIT - JEE Mains

In A Triangle ABC, AB = AC And D Is Any Point On BC. Find BD If AB = 17cm, AD = 15cm And CD = 4cm.

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

Solution 1: Apply cos c = (17^2 + 4^2 - 15^2)/2*17*4 = 10/17 in ADC. In ABC, cos C = ( 17^2 + (4+x)^2 - 17^2) / 2*17*(4+x) Find x. Find the angle cos C, then take BD as x. Then cos C will be same for both ADC and ABC Apply in ABC and get x.Solution 2: x=BD.Then, 1156 + 289 * x= 225(x+4) + 4*x*(x+4) by... read more

Solution 1:

Apply cos c = (17^2 + 4^2 - 15^2)/2*17*4 = 10/17 in ADC.

In ABC, cos C = ( 17^2 + (4+x)^2 - 17^2) / 2*17*(4+x)

Find x.

Find the angle cos C, then take BD as x.

Then cos C will be same for both ADC and ABC

Apply in ABC and get x.

Solution 2:

x=BD.Then, 1156 + 289 * x= 225(x+4) + 4*x*(x+4) by Stewart's theorem  => x = 16.

 

read less
Comments
Dislike Bookmark

Lesson Posted on 31 Jan IIT JEE/IIT - JEE Advanced/Physics/Modern Physics Tuition/Class XI-XII Tuition (PUC)/Physics

Why There Is A Bigger Hole (Compare To Other Two) In A Electric Socket?

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

Point 1: For case for ground pin. Also ground pin is larger that other two pins so that it would be the first to go into the hole and the last to come out of the hole just for sake of safety Point 2: This is done to prevent the user from accidentally inserting the live or neutral pin into the ground... read more

Point 1: For case for ground pin. Also ground pin is larger that other two pins so that it would be the first to go into the hole and the last to come out of the hole just for sake of safety

Point 2: This is done to prevent the user from accidentally inserting the live or neutral pin into the ground pin.

Point 3: It is because of simple thing:

i. If all are same sized then you will have 3 choices to plug in but every time you will not make it right so you get confusion.

ii. In order to eliminate that one of them is bigger than remaining ones so that every time you plugin you will get supply even if you use 2 pin plug.

Point 4: R proportional to L/A. So larger the cross sectional area lesser the resistance!  So with less resistance in case of fault all the current will pass through that pin(which is the ground) and make no harm to your circuit! Basically its for electrical safety!

read less
Comments
Dislike Bookmark

Lesson Posted on 31 Jan IIT JEE/IIT - JEE Advanced IIT JEE/IIT - JEE Mains CBSE/Class 10/Mathematics +1 Tuition/Class XI-XII Tuition (PUC) less

Derangements, Arrangement Of Things So That No Elements Appear In Their Original Place (Important for IITJEE)

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

"Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts." So number of ways: D(n)=n!*(1-1/1!+1/2!-1/3!+.....(-1)^n*1/n!)) Where n is number of things which don't go to their original positionhere... read more

 "Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts."

So number of ways:

D(n)=n!*(1-1/1!+1/2!-1/3!+.....(-1)^n*1/n!))

Where n is number of things which don't go to their original position
here in this question n = 5

So 5!*(1-1/1!+1/2!-1/3!+1/4!-1/5)) = 44 ways in which 5 tshirts won't go to their original position

D(1) = 0

D(2) = 1

D(3) = 2

D(4) = 9

D(5) = 44

D(6) = 265 (( remember these values of Dearangements )).

read less
Comments
Dislike Bookmark

Lesson Posted on 08 Feb CBSE/Class 11/Science/Physics Exam Coaching/CET Coaching/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/Physics +11 Tuition/Class XI-XII Tuition (PUC)/Physics Exam Coaching/Foreign Education Exam Coaching/Advanced Placement Tests Coaching/Physics IIT JEE/IIT - JEE Advanced/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Advanced Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Crash Course Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Foundation Course Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Integrated Coaching IIT JEE/IIT - JEE Mains IIT JEE/IIT - JEE Advanced IIT JEE less

Rotation: Introduction #1

Vishesh N

I have deep interest in the subject of Physics and love teaching my students the fine aspects of the...

Comments
Dislike Bookmark

Lesson Posted on 09 Feb CBSE/Class 11/Science/Physics Exam Coaching/CET Coaching/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/Physics +9 Exam Coaching/Foreign Education Exam Coaching/Advanced Placement Tests Coaching/Physics IIT JEE/IIT - JEE Advanced/Physics IIT JEE/IIT - JEE Mains/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Advanced Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Crash Course Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Foundation Course Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Integrated Coaching Exam Coaching/IIT JAM Coaching less

Rotation

Vishesh N

I have deep interest in the subject of Physics and love teaching my students the fine aspects of the...

Comments
Dislike Bookmark

Lesson Posted on 02 Feb IIT JEE/IIT - JEE Advanced/Mathematics/Analytical geometry (2 dimensions)

Plane Analytic Geometry

Raj Kumar

I am Six Sigma Black belt certified. I am 2011 pass out in B.tech from NIT Srinagar. I am an experienced,...

The curves that we learn about in this chapter are called conic sections. They arise naturally in many situations and are the result of slicing a cone at various angles. Depending on where we slice our cone, and at what angle, we will either have a straight line, a circle, a parabola, an ellipse or a... read more

                                                    conic section - ellipse

The curves that we learn about in this chapter are called conic sections. They arise naturally in many situations and are the result of slicing a cone at various angles.

Depending on where we slice our cone, and at what angle, we will either have a straight line, a circle, a parabola, an ellipse or a hyperbola. Of course, we could also get a single point, too.

Why study analytic geometry?

Science and engineering involves the study of quantities that change relative to each other (for example, distance-time, velocity-time, population-time, force-distance, etc).

It is much easier to understand what is going on in these problems if we draw graphs showing the relationship between the quantities involved.

The study of calculus depends heavily on a clear understanding of functions, graphs, slopes of curves and shapes of curves. For example, in the Differentiation chapter we use graphs to demonstrate relationships between varying quantities.

read less
Comments
Dislike Bookmark

Asked on 19 Jan IIT JEE

How to prepare for JEE Physics? #AMA

Answer

Lesson Posted on 16 Jan Tuition/Class XI-XII Tuition (PUC)/Physics IIT JEE/IIT - JEE Advanced/Physics/Modern Physics

How To Solve A Mechanics Problem?

Satya Reddy

I have graduated from IIT Kharagpur from Civil Engineering Discipline. I have been working for Ola Cabs...

Solving a mechanics problem especially at JEE level is all about getting into right thinking framework. Step 1: Picking a frame of reference. It can be solved from inertial frame of reference or non-nertial frame of reference (where a pseudo force acts). Step 2: Divide the problem into small parts and... read more

Solving a mechanics problem especially at JEE level is all about getting into right thinking framework. 

Step 1: Picking a frame of reference. It can be solved from inertial frame of reference or non-nertial frame of reference (where a pseudo force acts).

Step 2: Divide the problem into small parts and then draw the free body diagrams.

Step 3: Use the Newton's 3 Laws to write the equations.

Step 4: Solve the equations to get the answer.

read less
Comments
Dislike Bookmark

Asked on 16 Jan IIT JEE/IIT - JEE Advanced/Physics/Modern Physics

Is self induced emf in an inductor will be equal and opposite to the applied voltage? If yes then why... read more

Is self induced emf in an inductor will be equal and opposite to the applied voltage? If yes then why current flow in the circuit?

read less

Answer

Asked on 10 Jan IIT JEE/IIT - JEE Advanced

As the JEE Exam is approaching, so when will be the JEE Advance Form released for 2018?

Answer

About UrbanPro

UrbanPro.com helps you to connect with the best in India. Post Your Requirement today and get connected.

Overview

Questions 16

Lessons 12

Total Shares  

Top Contributors

Connect with Expert Tutors & Institutes for IIT JEE

x

Ask a Question

Please enter your Question

Please select a Tag