Rocket Thrust + Liquid Ejection Force | Fluid Mechanics L21 | JEE/CBSE

In this 15-minute lecture we derive the force of reaction due to ejection
of liquid — and connect it directly to rocket thrust.

⏱ TIMESTAMPS
00:00 Introduction & topics overview
01:30 Hydrostatic force on a blocking disc
03:30 Disc moved away — thrust force derivation
05:30 F = ρav² — the general thrust formula
07:00 🚀 Rocket thrust — physical reasoning
09:00 T = ṁv_rel + (Pe − Pa)Ae — full derivation
11:00 Problem 1 — two holes on opposite sides
12:30 Problem 2 — vertical slit (integration)
14:30 Summary of all results

📌 KEY RESULTS COVERED
- Hydrostatic force on disc: F = ρgha
- Liquid jet thrust: F = ρav² = 2ρgha
- Rocket thrust: T = ṁv_rel + (Pe − Pa)Ae
- Two-hole vessel (Prob 1): F = 2ρgah
- Vertical slit (Prob 2): F = ρgbl(2h − l)

This lecture is part of the complete Fluid Mechanics series for
Class 11 / JEE Mains / JEE Advanced / CBSE Board.

🔔 Subscribe for the full series:
CBSE & JEE Physics | Dr Kedar Pathak

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Видео Rocket Thrust + Liquid Ejection Force | Fluid Mechanics L21 | JEE/CBSE канала CBSE & JEE Physics | Dr Kedar Pathak