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A typical World War I biplane fighter (such as the French SPAD shown in Figure 3.50) has a number of vertical interwing struts and diagonal bracing wires. Assume for a given airplane that the total length for the vertical struts (summed together) is 25 ft. and that the struts are cylindrical with a diameter of 2 in. Assume also that the total length of the bracing wires is 80 ft. with a cylindrical diameter of
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Fundamentals of Aerodynamics
- Consider the figure shown below. If the weight of the picture frame is 10 N, What is the tension (T) in the string used to hang the frame? assume the angle is 30 degreesarrow_forwardAwnserarrow_forwardA 125 kg wheel with a radius of 2.50 m is being pulled up an incline by a 550 kg horse. There is a 45.0 cm high protrusion in the incline, as shown in the figure. a)What is the tension in the rope when the wheel is just beginning to lift off the incline to go over the protrusion? b)What is the minimum possible coefficient of static friction between the horse and the incline for the horse to be able to pull the wheel over the protrusion?arrow_forward
- Solve correctly please.arrow_forwardProblem 5 From the given truss shown: 100 N 200 N D A В 150 N 1.5 m 3 m 1.5 m Question 13 Which of the following most nearly gives the internal force at member BC. A 48.8 N (T) В 37.5 N (C) c) 88.5 N (C) D) 75.3 N (T) None of the above Question 14 Which of the following most nearly gives the internal force at member BD, in N? A) 62.5 (C) B) 38.6 (C) 49.3 (C) 79.2 (C) E None of the above Question 15 Which of the following most nearly gives the internal force at member CD, in N? А 130 (C) B 155 (T) 145 (C) D) 150 (T) None of the abovearrow_forward(2) Force P = 100 lb, is applied to a small pulley that rolls freely (no friction) on cable ACB. If the tension in the cable is 100 lb: a) What is the tension in the cable? 30°arrow_forward
- Urgentarrow_forwardProblem 4.30 While the stiffness of an elastic cord can be quite constant (i.e., the force versus displace- ment curve is a straight line) over a large range of stretch, as a bungee cord is stretched, it softens; that is, the cord tends to get less stiff as it gets longer. Assuming a soften- ing force-displacement relation of the form k8 - B83, where 8 (measured in ft) is the displacement of the cord from its unstretched length, considering a bungee cord whose unstretched length is 150 ft, and letting k = 2.58 lb/ft, determine the value of the con- stant B such that a bungee jumper weighing 170 lb and starting from rest gets to the bottom of a 400 ft tower with zero speed.arrow_forwardA wind tunnel model of an airplane wing is suspended as shown in the figure. What is the reaction in cable B if the forces at A are: L = 43.8 lbs; D = 3.42 lbs; and M = 20.60 in-lb counterclockwise. 3.42 lb3.38 lb47.18 lb40.42 lbarrow_forward
- A 110-kg uniform ladder is tied at its bottom on the wall using a wire shown in the figure. The floor is frictionless, while the wall is rough. The maximum tension on the wire is 180 N. (a) What is the normal force exerted by the wall on the ladder? (b) What is the frictional force exerted by the wall to the ladder?arrow_forwardCalculate the forces in member CF of the truss and state the member is in tension or compression using the method of sectionsarrow_forwardJohn is pushing his daughter Rachel in a wheelbarrow when it is stopped by a brick 8.00 cm high (see the figure below). The handles make an angle of 0 = 16.0° with the ground. Due to the weight of Rachel and the wheelbarrow, a downward force of 411 N is exerted at the center of the wheel, which has a radius of 18.5 cm. Assume the brick remains fixed and does not slide along the ground. Also assume the force applied by John is directed exactly toward the center of the wheel. (Choose the positive x-axis to be pointing to the right.) ..(a.).What force.(in N) must John apply along the handles to just start the wheel over the brick? Enter a number. differs from the correct answer by more than 10%. Double check your calculations. N (b) What is the force (magnitude in kN and direction in degrees clockwise from the −x-axis) that the brick exerts on the wheel just as the wheel begins to lift over the brick? magnitude KN direction o clockwise from the -x-axisarrow_forward
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