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Question No. 49
A rocket has a mass of 21000 kg of which 15000 kg is fuel. The rocket engine can exhaust fuel at the rate of 190 kg/s with an exhaust velocity of
2800m/s relative to the rocket. If the rocket is fire vertically upward, then the thrust of the rocket is X105N
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Answer:
mssraomaths35pak87l
08.09.2018
Physics
Secondary School
+5 pts
Answered
A rocket has a mass of 21000kg of which 15000kg is fuel.the rocket engine can exhaust fuel at the rate of 190kg per second with an exhaust velocity 2800metre per second relative to the ground.if the rocket is fired upwards final velocity at the burn out isplease answer me quickly
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Ayano160
Dear User
Velocity of rocket is given as
v=u ln(M/M-rt)
wher M is the total mass of rocket + fuel at t=0 sec = 20 +180 =200 kg
and r rate of fuel consumption =2kg/sec
u is the velocity of gas ejection w.r.t rocket = 1.6 km/sec
ultimate velocity is achieved when all the fuel will burn
ie. M-rt =20 kg
so v= 1.6 ln(180/20)
=3.515 km/sec
Hope it 8s correct because I am not very good in maths