Question

20. A6000 kg rocket is set for firing. If the exhaust speed
is 1000 m/s, how much gas must be ejected each
second to supply the thrust needed to overcome the
weight of the rocket?
(1) 30 kg
(2) 40 kg
(3) 50 kg
(4) 60 kg

pls answer with steps ​

Answer 1

Answer:

(4) 60 kg

Explanation:

Mass of the Rocket = 6000kg

Velocity = 100m/s

Thrust = Force = Velocity × dm/dt

Force = mass × gravitational constant

= 6000 × 10

Thrust = 60000 m/s×s

Thrust = 1000 × dm/dt

60000/1000 = dm/dt

dm/dt = 60 kg/sec

As the weight is asked, the answer is 60kg.

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Answer 2

NANBA..

THE ANSWER IS 40kg ....

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