A rocket of mass 4000 kg is set for vertical firing. How much fuel must be consumed per second so that the rocket may have initial upwards acceleration of magnitude 19 . 6 m s 2 . [Exhaust gases speed = 980 m s ]

Question

A rocket of mass 4000 kg is set for vertical firing. How much fuel must be consumed per second so that the rocket may have initial upwards acceleration of magnitude 19 . 6 m s 2 . [Exhaust gases speed = 980 m s ], 240 kg s - 1, 60 kg s - 1, 120 kg s - 1, None

MARKS App · Accepted Answer

ma = u dm dt - mg ⇒ u dm dt = m a + g ⇒ dm dt = 4 0 00 × 1 9 . 6 + 9 . 8 9 8 0 dm dt = 1 2 0 kg/s

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