SOLUTION: A rocket of mass 1200 kg is traveling at 2000 m/s. It fires its engine for 1 minute. If the forward thrust provided by the rocket engines is 10000 N, what is the increase in moment
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Question 1067388: A rocket of mass 1200 kg is traveling at 2000 m/s. It fires its engine for 1 minute. If the forward thrust provided by the rocket engines is 10000 N, what is the increase in momentum of the rocket? From this, work out the increase in velocity of the rocket and its new velocity after firing the engines. Answer by ikleyn(52786) (Show Source):
From Physics (Mechanics), there is this impulse-momentum change equation:
= F*t, ( http://www.physicsclassroom.com/class/momentum/Lesson-1/Momentum-and-Impulse-Connection )
where m is the mass of a body, F is a force acting to the body, t is time and = is the change of velocity.
We consider everything is happen along a straight line, and gravitation does not participate.
So, the increase of momentum is F*t = 10000 N * 60 seconds = 600000 N*s = 600000 (kg*m)*s/s^2 = 600000 kg*m/s.
Increase of velocity is = = = 500 m/s.
New velocity after the engine was firing during 60 seconds is 2000 + 500 = 2500 m/s.
