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  3. a rocket has an initial mass of 28500 kg, of which

A rocket has an initial mass of 28500 kg, of which 20% is the payload (i.e.,...

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Physics

A rocket has an initial mass of 28500 kg, of which 20% is thepayload (i.e., the mass of the rocket minus the fuel). It burnsfuel at a rate of 195 kg/s and exhausts its gas at a relative speedof 1.5 km/s.

(a) Find the thrust of the rocket.
kN
(b) Find the time until burnout.
s
(c) Find its final speed assuming it moves upward near the surfaceof the earth where the gravitational field g isconstant.
km/s

Answer & Explanation Solved by verified expert
3.8 Ratings (399 Votes)
a Thrust is the force exerted by the exiting engine gases mass flow rate velocity of exhaust 195 kgs 15 1000 ms 292500 N b Of total load of 28500 kg 80 is fuel 22800 kg burning at 195 kgs it will burn for t    See Answer
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