list of all good lectures on RoTMot

JEE ADVANCED 2017 SOLUTIONS - Find out how to solve the TWIRLING RING problem

https://youtu.be/MCDFTLtGLNk?si=Dka9xCO-c86N6PGd

Rotation Problem for JEE Advanced only Top 100 rankers will be able to solve

https://youtu.be/X0QnmhiLFvY?si=-PclNYjnixpX8Omt

https://youtu.be/8sI_VpXcIME?si=EpEP4IPJkzRU6UiG

Solution of IRODOV problem1.267 by RKH SIR

JEE Advanced 2016 Rotation Problem - easy Solution by SBT | Most difficult JEE Advanced PYQ

https://youtu.be/DbDjaJhmqkE?si=TRwhAYbu3A5z2fgE

Instantenous Axis of Rotation in multi Rotatory System and its use by RKH SIR(B.TECH IIT D)

https://youtu.be/9yC5yVVZvkQ?si=2pJAVdAK0nrNI6yU

Unbelievable Trick Revealed: Rotating Vectors Differentiated 2020 times?!

https://youtu.be/PcLQP4QlO6M?si=abw67tP3SjeNrfYy

IRODOV SELECT SOLUTIONS-💥PROB 1-57 -ROLLING CONE'S ANGULAR VELOCITY AND ANGULAR ACCELERATION

https://youtu.be/UVV-rDtPp0I?si=-M5UJmzlIAJjjGbF

JEE ADVANCED QUICKIES | SURFACE TENSION | PROVING CONTACT ANGLE USING ENERGY ANALYSIS | YOUNG'S EQN

https://youtu.be/kyZBfOI1cVs?si=A1B3PA9VFB9z4oFl

https://youtu.be/_vzNri_qCpA?si=vifM9zYkBHjiCd_b

ORIGINALS | JEE ADVANCED | ACCELERATION OF ICR ? SPACE OR MATERIAL POINT ?

JEE ADVANCED 2016 PROBLEM On ROTATION | TOUGHEST ROLLING PROB | ALL CONCEPTS EXPLAINED😍 Read Desc👇

https://youtu.be/9zRtldkLVPA?si=HHEKRFpjvEyEVkKJ

Rotating vectors - Physics concepts for JEE Advanced #sbt #jeephysics #Rotation #iit

https://youtu.be/RA2t7kTeu5o?si=dsG_jUjy3AVCfPSi

JEE ADVANCED 2017 Finger - Ring Problem #pyq #sbt #jeeadvanced #jeephysics

https://youtu.be/fyOCBGhlQ8w?si=FunGHXLwB-iqOLdb

IRODOV SELECT SOLUTIONS-💥PROB 1-57 -ROLLING CONE'S ANGULAR VELOCITY AND ANGULAR ACCELERATION

https://youtu.be/UVV-rDtPp0I?si=9Ep34-hwVgFey5Qd

https://youtu.be/rFTxNjuOzWI?si=7vHppzpKDGNANw73

IRODOV Sec.1.1 Q.57 Cone Rotating without slipping for IIT JEE (‪@PaPhysics_Manish‬ )

Rotation Problem for JEE Advanced only Top 100 rankers will be able to solve

https://youtu.be/X0QnmhiLFvY?si=u6cUkwcDM44nnXGW

https://galileoandeinstein.phys.virginia.edu/7010/CM_24_Moments_of_Inertia.html

Instantaneous Axis of Rotation with PYQs #jee #neet Vikrant Kirar

https://youtu.be/m-bJ1xITXSk?si=sTTUBN7mwqOrqqw3

Ninja Sir Explained JEE Advanced 2016 Question of Rotational Motion!

https://www.youtube.com/watch?v=qSXaS03xF8o

https://www.youtube.com/watch?v=7_roWwZewAw

04- Instantaneous Axis of Rotation | #IAOR #IAR #ROTATION #JEE #mains #neet #physics

https://www.youtube.com/watch?v=UVV-rDtPp0I

IRODOV SELECT SOLUTIONS-💥PROB 1-57 -ROLLING CONE'S ANGULAR VELOCITY AND ANGULAR ACCELERATION

https://www.youtube.com/watch?v=UsC2i4K-F1E

IIT JEE Preparation | Rolling Cone and its angular Velocity | Kinematics of Rigid Body Rotation

Present Tense (Präsens) Conjugations for essential German Verbs ( machen , lernen , arbeiten , spielen , kaufen , fahren , lesen , sprechen , nehmen , essen )

 machen (to make/do)

ich mache	I do
du machst	you do
er/sie/es macht	he/she/it does
wir machen	we do
ihr macht	you guys do
sie machen	they do

lernen (to learn)

ich lerne
du lernst
er lernt
wir lernen
ihr lernt
sie lernen arbeiten (to work) → extra -e- sound ich arbeite du arbeitest er arbeitet wir arbeiten ihr arbeitet sie arbeiten spielen (to play) ich spiele du spielst er spielt wir spielen ihr spielt sie spielen kaufen (to buy) ich kaufe du kaufst er kauft wir kaufen ihr kauft sie kaufen fahren (to drive/go) ich fahre du fährst er fährt wir fahren ihr fahrt sie fahren lesen (to read) ich lese du liest er liest wir lesen ihr lest sie lesen sprechen (to speak) ich spreche du sprichst er spricht wir sprechen ihr sprecht sie sprechen nehmen (to take) ich nehme du nimmst er nimmt wir nehmen ihr nehmt sie nehmen essen (to eat) ich esse du isst er isst wir essen ihr esst sie essen Key observation Stem-change verbs change only in du and er/sie/es Verb Change fahren a → ä lesen e → ie sprechen e → i nehmen e → i essen e → i

THE CONJUGATION TRICK

You only decide:

1. Is the verb regular?

2. Does it need an extra e sound?

3. Does the vowel change for du / er?

Everything else is automatic.

The “E-buffer” rule (sound comfort rule)

If the stem ends in t, d, m, n + consonant, German inserts extra e

Because Germans don’t like hard consonant collisions.

So instead of:

arbeitst ❌
you get
arbeitest ✔

Trigger letters

t, d, chn, ffn, tm

Verb	Result
arbeiten	du arbeitest
reden	du redest
öffnen	du öffnest

Think:

tongue needs breathing space → add e

---

The vowel-change family (only 3 patterns exist)

Only happens in du & er/sie/es

Family A → ä

(a becomes ä)

fahren → fährst, fährt

---

Family E → IE

(long sound)

lesen → liest
sehen → sieht

---

Family E → I

(short sound)

sprechen → sprichst
nehmen → nimmst
essen → isst

---

The universal shortcut

When you see a new verb, ask:

1. ends in -en? → normal endings

2. difficult consonant? → add e

3. strong vowel? → change only for du/er

Done.

---

Apply instantly

kaufen

• normal → kaufst

arbeiten

• needs buffer → arbeitest

fahren

• a→ä → fährst

lesen

• e→ie → liest

sprechen

• e→i → sprichst

---

The deep insight

German present tense is not memorization.

It is:

pronunciation physics + 3 historical vowel shifts

Once your ear notices comfort + vowel pattern, you can conjugate verbs you have never seen before.

PRACTICE WORKSHEET FOLLOWS 

1. Ich ________ Deutsch. (lernen)
   I learn German.

2. Er ________ nach Berlin. (fahren)
   He goes/drives to Berlin.

3. Wir ________ Pizza. (essen)
   We eat pizza.

4. Du ________ sehr gut Deutsch. (sprechen)
   You speak German very well.

5. Sie ________ ein Auto. (kaufen)
   She/They buy a car.

6. Ihr ________ ein Buch. (lesen)
   You guys read a book.

7. Ich ________ mit meiner Mutter. (sprechen)
   I speak with my mother.

8. Er ________ das Buch. (nehmen)
   He takes the book.

9. Wir ________ im Park. (spielen)
   We play in the park.

10. Du ________ Hausaufgaben. (machen)
    You do homework.

---

11. Ich ________ heute viel. (arbeiten)
    I work a lot today.

12. Sie ________ jeden Tag Deutsch. (lernen)
    She/They learn German every day.

13. Wir ________ zusammen Fußball. (spielen)
    We play football together.

14. Er ________ Wasser. (nehmen)
    He takes water.

15. Du ________ ein Geschenk. (kaufen)
    You buy a gift.

16. Ihr ________ sehr schnell. (fahren)
    You guys drive/go very fast.

17. Ich ________ einen Roman. (lesen)
    I read a novel.

18. Sie ________ mit dem Lehrer. (sprechen)
    She/They speak with the teacher.

19. Wir ________ Abendessen. (essen)
    We eat dinner.

20. Er ________ seine Arbeit gut. (machen)
    He does his work well.

---

21. Du ________ in einem Büro. (arbeiten)
    You work in an office.

22. Ihr ________ neue Wörter. (lernen)
    You guys learn new words.

23. Ich ________ mit dem Bus. (fahren)
    I go/travel by bus.

24. Sie ________ Karten im Garten. (spielen)
    She/They play cards in the garden.

25. Wir ________ den Apfel. (nehmen)
    We take the apple.

German Continuous and Indefinite is same

In German there is NO separate grammatical tense equivalent to the English “continuous / progressive” form (am doing, is going, are eating).

So in most situations:

> English present simple = English present continuous = German Präsens

German uses one tense (Präsens) and context decides whether the action is habitual, happening now, temporary, or scheduled.

---

 1. The Core Idea

German speakers simply do not mark the difference grammatically.

They rely on:

* time words

* context

* tone

---

2. How German Shows “Continuous” Meaning Instead

Instead of changing verb form, German adds time indicators

👉 gerade is the closest natural equivalent to “-ing”

---

Important Insight (Very Useful)

So German collapses:

> I read books

> I am reading books

> I do read books

into:

> **Ich lese Bücher**

Only context changes interpretation.

Same verb form every time.

Conclusion

German does not grammatically separate:

* simple present

* present continuous

* near future

They are all expressed using Präsens + context words.

So yes — functionally:

German continuous and indefinite (simple present) are the same tense.

The meaning changes through adverbs, not verb structure.

The Layered Approach to Retirement Planning in India: Stop Chasing 10–15 Crores and Start Building Freedom One Step at a Time

The Layered Approach to Retirement Planning in India: Stop Chasing 10–15 Crores and Start Building Freedom One Step at a Time

You open a retirement calculator, punch in your current expenses, and the screen spits out ₹10 crore… ₹12 crore… sometimes even ₹15 crore.

Your stomach drops. You quietly close the tab and tell yourself, “This is not for people like me.”

The problem isn’t that we earn too little. The problem is that traditional retirement calculators force us to buy our entire dream retirement on day one — groceries, medical emergencies, eating out, vacations, international travel, everything — from the very first month we stop working.

That’s not a plan. That’s a fantasy. And fantasies create paralysis.

Here’s a completely different way to think about retirement that actually works in India: the layered financial freedom ladder.

Instead of one terrifying finish line, you climb five manageable stages. Each stage gives you real peace of mind before you reach the next one. And the best part? Stage 1 — bare survival with dignity — is often far closer than you think.

Stage 1: Bare Essential Freedom (Survival with Dignity)

This is the most important and most misunderstood stage. It doesn’t buy you a luxurious life. It buys you self-respect.

Meet “Monty” — a regular salaried Indian who just wants to never beg, borrow, or tolerate nonsense at work.

His monthly survival budget (today’s prices, family of 3–4, child education handled separately because it ends):

• Groceries & basic food: ₹25,000
• Electricity + water: ₹5,000
• Cooking gas: ₹1,000
• Wi-Fi + phones + basic TV: ₹4,000
• Health + term insurance premiums: ₹5,000
• Fuel (two-wheeler or local transport): ₹2,000
• Medicines + small health expenses: ₹2,000
• House maintenance + miscellaneous: ₹6,000

Total: ₹50,000 per month

No eating out. No movies. No maid. No vacations. No upgrades. This is self-respect money, not happiness money.

Now the magic number.

Assumptions (very India-realistic):

• Retire at 40, live till 80 (40 years)
• Portfolio return: 9% (achievable with 60–70% equity index funds + debt)
• Inflation: 7%
• Real return: 2%

Corpus needed at retirement: ≈ ₹1.7 crore

Not 10. Not 15. 1.7 crore.

When people see this number, something shifts in their brain. The impossible suddenly becomes possible. That mental shift is where real financial freedom begins.

Stage 2: The 10% Health Buffer (Separate Medical Corpus)

Never mix retirement corpus and medical expenses. Insurance reduces risk, but it doesn’t make bills disappear.

Simple rule I follow: Keep at least 10% of your retirement corpus in a completely separate medical buffer (liquid, in debt funds or liquid funds).

For Stage 1 (₹1.7 cr) → ₹15–20 lakh separate for health.

This one decision removes 80% of retirement anxiety for most families.

Stage 3: Making the Plan Robust (Ultra-Conservative Assumptions)

Now that fear is gone, let’s stress-test.

New assumptions:

• Return: 8% (more conservative)
• Life expectancy: 90 (50 years in retirement)
• Inflation still 7%

Corpus needed for the same ₹50,000/month: ≈ ₹2.4 crore

The jump isn’t scary anymore because you already secured Stage 1 in your mind.

Stage 4: Comfortable Freedom

Work isn’t killing you anymore. You want occasional eating out, a maid, movies, small upgrades, and one domestic vacation a year.

Expenses rise to ₹1 lakh per month.

Using original assumptions → ≈ ₹4.8 crore

Stage 5: Luxury / Ultra-Safe Freedom

You want zero stress. You assume portfolio only matches inflation (7% return = 0% real return) and plan for 50 years.

• ₹50,000/month → ₹3 crore
• ₹1 lakh/month → ₹6 crore

 If your retirement plan includes vacations and luxury before you have secured bare survival and medical safety, you don’t have a plan. You have anxiety wearing a spreadsheet.

Stop asking: “How much do I need for everything in life?”

Start asking: “What is the next layer I need to secure?”

Build it in the right order — survival → medical → robust → comfort → luxury — and you will reach financial freedom much faster than the scary calculators want you to believe.

Start with Stage 1.

The rest will feel surprisingly doable once the first layer is in place.

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Disclaimer: This is not financial advice. Numbers are illustrative based on reasonable assumptions. Past performance is no guarantee of future results. Please consult a SEBI-registered financial advisor before making any decisions.

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