From: joe@strout.net   
      
   In article ,   
    "Makhno"  wrote:   
      
   > Given a rocket or mass M ejecting as its exhaust a mass stream at a rate m,   
   > and energy is imparted into this mass at a rate (power) of P, is it possible   
   > to calculate the acceleration of the rocket? Or is it necessary to to have   
   > the ejection velocity of the mass?   
      
   You need the ejection velocity of the mass, as well as how much mass is   
   ejected and the (initial or final) mass of the rocket.  Here's a page   
   that puts these together to give you the acceleration (delta-V):   
      
        
      
   > Is it also possible to derive the specific impulse of the fuel from this   
   > information?   
      
   Well, specific impulse is pretty much just another way of presenting the   
   exhaust velocity.   
      
   So, the question is, can you calculate the velocity of the mass from the   
   power used to accelerate it?   
      
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