Engineering Mechanics - DynamicsChapter 15Solution:The system consists of the car and the scoop. In all cases ΣFsmtvddVDetmedd−=F0VρAV−=FV2A=Problem 15-122A rocket has an empty weight W1and carries fuel of weight W2. If the fuel is burned at the ratecand ejected with a relative velocity vDR, determine the maximum speed attained by the rocketstarting from rest. Neglect the effect of gravitation on the rocket.Given:W1500 lb=W2300 lb=c15lbs=vDR4400fts=g32.2fts2=Solution:m0W1W2+g=The maximum speed occurs when all the fuel is consumed, that is, where
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