Chapter 13, Problem 128P

A child having a mass of 30 kg holds her legs up as shown as she swings downward from rest at Ø1 = 30°. Her center of mass is located at point G1. When she is at the bottom position Ø = 0°, she suddenly lets her legs come down, shifting her center of mass to position G2. Determine her speed in the upswing due to this sudden movement and the angle Ø2 to which she swings before momentarily coming to rest. Treat the child's body as a particle. %3D 3 m 02 2.80 m 0, = 30° G2 G2

The 0.5-lb projectile A is subjected to a drag force of magnitude kv2, where the constant k = 0.0003 lb-sec²/ft2. This drag force always opposes the velocity v. At the instant depicted, v = 210 ft/sec, 0 = 41°, and r = 495 ft. Determine the corresponding values of r and 0. y | ku² Answers: i M. 0 = i 0 T A V 170 --x ft/sec² rad/sec²

The small cylinder C has a mass of 10 kg and is attached to the end of a rod whose mass may be neglected. The frame is subjected to a couple of moment M = 26Nm, and the cylinder is subjected to a force of F = (5t² + 6) N, where t is in seconds, which is always directed in the same direction as the cylinder's velocity as shown. The cylinder has a speed vo= 2 m/s when t = 0. (Figure 1) Figure 0.75 m M 1 of 1 Part A Determine the speed of the cylinder when t = 3 s. Express your answer to three significant figures and include the appropriate units. v= |μA Value Submit Request Answer < Return to Assignment Units Provide Feedback ?

The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, θθ = 34°, θ˙θ˙ = 43 deg/s, and θ¨θ¨ = 10 deg/s2. Determine the magnited of the force F applied by arm OA and the magnitude of the force N applied by the sides of the slot to the 0.3-kg slider B. Neglect all friction, and let L = 0.88 m. The motion occurs in a vertical plane.

Dynamic

The tractor is used to lift the 170-kg load B with the 24-m-long rope, boom, and pulley system. The tractor travels to the right with an acceleration of 4 m/s² and has a velocity of 5 m/s at the instant SA = 5 m. When SA = 0, SB = 0. (Figure 1) Figure 12 m -SA 1 of 1 Part A Determine the tension in the rope at this instant. Express your answer to three significant figu T = Value N Submit Previous Answers Request Answ X Incorrect; Try Again

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The 333-Mg jet airliner has three engines, each of which produces a nearly constant thrust of 230 kN during the takeoff roll. Determine the lengths of runway required if the takeoff speed is 213 km/h. Compute s first for an uphill takeoff direction from A to B and second for a downhill takeoff from B to A on the slightly inclined runway. Neglect air and rolling resistance. Assume 0 = 0.7°. 0 Answers: Horizontal Uphill from A to B: Downhill from B to A: S= i S= i B m 3

The 8-kg collar has a velocity of 8 m/s to the right when it is at A. It then travels down along the smooth guide as shown in (Figure 1). The spring has an unstretched length of 100 mm and B is located just before the end of the curved portion of the rod. Figure 200 mm www. 200 mm k = 50 N/m 1 of 1 ▶ Part A Part B What is the normal force on the collar at this instant? Express your answer to three significant figures and include the appropriate units. N = Submit μA Value Provide Feedback Request Answer Pearson Units ? Review Next >