388_Dynamics 11ed Manual

388_Dynamics 11ed Manual - Engineering Mechanics Dynamics...

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Engineering Mechanics - Dynamics Chapter 15 Solution: The system consists of the car and the scoop. In all cases Σ F s m t v d d V De t m e d d = F 0 V ρ AV = FV 2 A = Problem 15-122 A rocket has an empty weight W 1 and carries fuel of weight W 2 . If the fuel is burned at the rate c and ejected with a relative velocity v DR , determine the maximum speed attained by the rocket starting from rest. Neglect the effect of gravitation on the rocket. Given: W 1 500 lb = W 2 300 lb = c 15 lb s = v DR 4400 ft s = g 32.2 ft s 2 = Solution: m 0 W 1 W 2 + g = The maximum speed occurs when all the fuel is consumed, that is, where
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