71_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 12 Rv 0 cos θ () t = R 2 v 0 2 g sin cos = h 1 2 g t 2 2 v 0 sin t 2 + = h v 0 2 sin 2 g = Problem 12–90 The fireman standing on the ladder directs the flow of water from his hose to the fire at B . Determine the velocity of the water at A if it is observed that the hose is held at angle . Given: 20 deg = a 60 ft = b 30 ft = g 32.2 ft s 2 = Solution: Guesses v A 1 ft s = t 1s = Given v A cos ta = 1 2 gt 2 v A sin t b = v A t
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