TS Police Constable Prelims 2022 · Question 74

Question 74 of the TSLPRB Police Constable Preliminary Written Test 2022 (28 August 2022). Try it first, then open the answer and explanation.

1. PC Prelims 2022 · Q74 · General Science · Physics

   The escape velocity on the surface of the earth is

   1. 9.8 km/s
   2. 11.2 km/s
   3. 19.6 km/s
   4. 4.9 km/s

   భూమి ఉపరితలంపై పలాయన వేగము విలువ

   1. 9.8 km/s
   2. 11.2 km/s
   3. 19.6 km/s
   4. 4.9 km/s
   Show answer

   Answer: (2) 11.2 km/s

   సమాధానం: (2) 11.2 km/s

   Escape velocity v = √(2gR) = √(2 × 9.8 × 6.4 × 10^6) m/s ≈ 11,200 m/s, i.e. about 11.2 km/s. 9.8 is the value of g in m/s², not a velocity.

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