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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.

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Comments 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!

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Comments Lesson Posted on 31 Jan IIT JEE/IIT - JEE Advanced IIT JEE/IIT - JEE Mains CBSE/Class 10/Mathematics

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

here in this question n = 5

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Comments Lesson Posted on 08 Feb CBSE/Class 11/Science/Physics Exam Coaching/CET Coaching/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/Physics

Vishesh N

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

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Comments Lesson Posted on 09 Feb CBSE/Class 11/Science/Physics Exam Coaching/CET Coaching/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/Physics

Vishesh N

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

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

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

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Comments Asked on 19 Jan IIT JEE

How to prepare for JEE Physics? #AMA

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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

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Comments 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?

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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?

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