94_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Unformatted text preview: Engineering Mechanics - Dynamics Chapter 12 Solution: (vA + vB)t = 2π ρ 2π ρ vA + vB t= t = 14.28 s aB = vB 2 ρ aB = 0.45 m 2 s Problem 12-127 The race car has an initial speed vA at A . If it increases its speed along the circular track at the rate at = bs, determine the time needed for the car to travel distance s1. Given: vA = 15 m s −2 b = 0.4 s s1 = 20 m ρ = 150 m Solution: at = b s = v v d v ds s ⌠ ⌠ ⎮ v dv = ⎮ b s d s ⌡0 ⌡v v d s= dt 2 vA 2 2 s − =b 2 2 2 A v= 2 2 vA + b s 92 ...
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