Concept explainers
The lumbar portion of the human spine supports the entire weight of the upper torso and the force load imposed on it. We consider here the disk (shaded red) between the lowest vertebra of the lumbar region
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Engineering Mechanics: Statics
- The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016, determine the force F required to advance the bar at a constant speed.arrow_forwardThe figure shows a three-pin arch. Determine the horizontal component of the pin reaction at A caused by the applied force P.arrow_forwardA 10-m uniform beam of weight 100 N is supported by two ropes at its ends. If a 400-N person sits at the center of the beam, what is the tension in the right rope?arrow_forward
- Consider the force P applied at point A on the plate of the figure shown (image 1). Assuming that the weight of the plate is negligible, and that the horizontal force F, as well as the reactions Dy and Dx in the joint D balance the plate shown in the figure, choose the alternatives that are true. Note: the x-axis is horizontal and the y-axis is vertical and both have their origin at point D. Data: P = 332N If the plate had a weight of 332N (applied vertically downwards in the center of the plate), the reaction Dy on the plate should be vertical downwards so that the plate still remained in balance in that position. True or false?arrow_forwardConsider the force P applied at point A on the plate of the figure shown (image 1). Assuming that the weight of the plate is negligible, and that the horizontal force F, as well as the reactions Dy and Dx in the joint D balance the plate shown in the figure. Note: the x-axis is horizontal and the y-axis is vertical and both have their origin at point D. Data: P = 332N Which option is right? a) if the plate had a weight of 332N (applied vertically downwards in the center of the plate), the reaction Dy on the plate should be vertical downwards so that the plate still remained in balance in that position or b) if the plate had a weight of 332N (applied vertically downwards in the center of the plate), the reaction Dy on the plate should be vertical downwards so that the plate still remained in balance in that positionarrow_forwardDraw the free-body diagram of the smooth uniform bar shown in Fig. 2. The bar has a mass of 20 kg.arrow_forward
- An engineer trying to determine whether her crane will tip over when attempting to lift a 13K load. Her crane has a 15K chassis and 35K counterweight. Assume all other parts of the crane have negligible weight. Answer all questions relative to the rotation point. How much torque is caused by the load? How much torque is caused by the chassis? How much torque is caused by the counterweight? What is the normal force on the rear (right) outriggers? What is the normal force on the front (left) outriggers? *each box in picture = 5 ftarrow_forwardConsider the force P applied at point A on the plate of the figure shown (image 1). Assuming that the weight of the plate is negligible, and that the horizontal force F, as well as the reactions Dy and Dx in the joint D balance the plate shown in the figure. Note: the x-axis is horizontal and the y-axis is vertical and both have their origin at point D. Data: P = 332N The next affirmative is true or false? If the plate had a weight of 332N (applied vertically downwards in the center of the plate), the module of F should be greater than 369.18N, so that it would still remain balanced in that position.arrow_forwardA ball of mass mand radius Rrests at the edge of a step barrier of height has shown in thefigure. There is a horizontal force Tapplied to the ball from its top through a string wrapped around the ball to lift it above the barrier as shown in the figure. What is the minimum tension required to begin to lift the ball off the ground? (g = 9.8 m/s2, m = 1 kg, R = 0.5 m, h = 0.2 m).arrow_forward
- A uniform horizontal beam with a length of 1.7 m and a weight of 200 N is attached to a wall by a pin connection. Its far end is supported by a cable that makes an angle of 35.0° with the horizontal. If a crate of mass (M) 87 kg hanged 1.7 m from the wall, find the tension in the cable, as well as the magnitude and direction of the resultant force exerted by the wall on the beam.arrow_forwardProblem 2.- The small piston of a hydraulic lift (Fig. 3) has a cross-sectional area of 3.00 cm2 and its large piston has a cross-sectional area of 200 cm2 What force of magnitude F1 must be applied downwards to the small piston in order to lift a load whose weight is Fg = 15.0 KN?arrow_forwardTwo smooth spheres of weight W and radius r each are in equilibrium in a horizontal channel of A and B vertical sides as shown in the figure. Find the force exerted by each sphere on the other. Calculate these values, if r=250mm, b=900mm and W=100N.arrow_forward
- International Edition---engineering Mechanics: St...Mechanical EngineeringISBN:9781305501607Author:Andrew Pytel And Jaan KiusalaasPublisher:CENGAGE L