128_Dynamics 11ed Manual

128_Dynamics 11ed Manual - Problem 12183 The motor draws in...

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Engineering Mechanics - Dynamics Chapter 12 v C 2 ft s = Solution: S A 2 S B + S C + L = Taking time derivative: v A 2 v B + v C + 0 = v B v C v A + () 2 = v B 1 ft s = Positive means down, negative means up. Problem 12-182 If block A is moving downward at speed v A while block C is moving down at speed v C , determine the relative velocity of block B with respect to C . Given: v A 6 ft s = v C 18 ft s = Solution: S A 2 S B + S C + L = Taking time derivative v A 2 v B + v C + 0 = v B v A v C + () 2 = v B 12 ft s = v BC v B v C = v BC 30 ft s = Positive means down, negative means up
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Unformatted text preview: Problem 12183 The motor draws in the cable at C with a constant velocity v C . The motor draws in the cable at D with a constant acceleration of a D . If v D = 0 when t = 0, determine (a) the time needed for block A to rise a distance h , and (b) the relative velocity of block A with respect to block B when this occurs. 126...
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