HW07-Assignment

# HW07-Assignment - ENES 221 Fall 2011 Homework#7 Due by 5 pm...

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ENES 221, Fall 2011 Homework #7 Due by 5 pm on Wednesday, October 19, 2011 1. The jet plane is traveling at a constant speed of 1000 ft/s along the curve y = (20x10 -6 ) x 2 + 5000, where x and y are in feet. If the pilot has a weight of 180 lb, determine the normal and tangential components of the force the seat exerts on the pilot when y = 10000 ft. 2. The 5-kg pendulum bob B is released from rest when θ = 0 o . Determine a) the initial tension in the cord and b) tension at the instant the bob reaches point D, where θ = 45 o . Neglect the size of the bob. 3. The 6-kg block is confined to move along the smooth parabolic path. The attached spring restricts the motion and due to the roller guide, always remains horizontal as the block descends. If the spring has a stiffness of k = 10 N/m and an unstretched length of 0.5 m, determine the normal force of the path on the block at the instant x = 1 m and the block has a speed of 4 m/s. Also find the rate of increase in speed of the block at this instant. Assume that

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