78_Dynamics 11ed Manual

78_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 12 Given: ρ 250 ft = t 2 4s = b 3 ft s 2 = c 3 ft s 3 = t 1 3s = Solution: vb tc t 2 + = a t b 2 ct + = At t 1 v 1 bt 1 ct 1 2 + = a t1 b 2 ct 1 + = a n1 v 1 2 = a 1 a t1 2 a n1 2 + = a 1 21.63 ft s 2 = Distance traveled d 1 b 2 t 1 2 c 3 t 1 3 + = d 1 40.5 ft = Problem 12-102 At a given instant the jet plane has speed v and acceleration a acting in the directions shown. Determine the rate of increase in the plane’s speed and the radius of curvature of the path. Given: v 400 ft s = a 70 ft s 2 = θ 60 deg = Solution: Rate of increase a t a ( )cos () = a t 35 ft s 2 = Radius of curvature a n a ( )sin () = v 2 = v 2 a ( )sin
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