389_Dynamics 11ed Manual

389_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 15 Problem 15-123 The boat has mass M and is traveling forward on a river with constant velocity v b , measured relative to the river. The river is flowing in the opposite direction at speed v R . If a tube is placed in the water, as shown, and it collects water of mass M w in the boat in time t , determine the horizontal thrust T on the tube that is required to overcome the resistance to the water collection. Units Used: Mg 10 3 kg = Given: M 180 kg = M w 40 kg = v b 70 km hr = t 80 s = ρ w 1 Mg m 3 = v R 5 km hr = Solution: m' M w t = m' 0.50 kg s = v di v b = v di 19.44 m s = Σ F i m t v d d v di m' + = Tv di m' = T 9.72 N = * Problem 15-124 The second stage of a two-stage rocket has weight
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This note was uploaded on 08/16/2011 for the course EGN 3321 taught by Professor Christianfeldt during the Spring '08 term at University of Central Florida.

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