Space missions, full chapter
JR Tutorials · YouTube
Satellites, orbits, launch vehicles and India's programme, covered end to end.
Space Missions
Chapter 10 of Science and Technology Part 1, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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All the numericals
Parth Momaya · YouTube
The calculation questions from this chapter worked through — critical velocity and orbital period.