(a) State the coaditions for the equilibrium of a body which is acted upon by a number of forces.
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Q: draw the free-body diagrams for the entire assembly (or structure) and each of its parts. Neglect…
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Q: ________
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Q: ighs 100 lb. (a) If the supports are smooth (there is no friction between the supports and cable),…
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A: Given data: T=2250 Nl=30 cm Need to determine the maximum mass that can be held in this way.
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- (c) Determine the tensions in the string on both sides of the pulley.An incident involving unexpected collapse of a deck on a cruise linerhas been reportedto a regulator. Preliminary investigationpoints to possible problemsinstructural panels made of continuous and oriented fiber-reinforced composite.The quality of components needsto be checked to specification.Laboratory testing ofsamples fromthe composite panels revealed the moduli of elasticity in the longitudinal and transverse directions to be 25GPaand 5GPa, respectively. The volume fraction of fibers is 0.20. (a)Determine the moduli of elasticity of fiber and matrix phasesto help the investigation. (b)Besides the quality of individual components, what else could lead to the premature failure of continuous and oriented fiber-reinforced composites?(III) A steel cable is to support an elevator whose total (loaded) mass is not to exceed 3100 kg. If the maximum acceleration of the elevator is 1.8 m/s2calculate the diameter of cable required. Assume a safety factor of 8.0.
- A bricklayer is nailing a plaster panel, while you provide support on the other side of a lightweight partitionby leaning your back against it. Each blow of the hammer makes his back hurt. The supervisor helps you by placing aheavy block of wood between the partition and your back.(d) Conceptual discussion - Using the situation discussed above as a model, explain how this change makes your work more confort'a.makes your work more comfortable.Distinguish between concurrent forces and coplanar forces.A 2.0-m-high box with a 1.0-m-square base is moved across a rough floor as in Fig. 9–89. The uniform box weighs 250N and has a coefficient of static friction with the floor of 0.60. What minimum force must be 1.0 m exerted on the box to make it slide? What is the maximum height h above the floor that this force can be applied without tip- ping the box over? Note that as the box tips, the normal force CG 2.0 m FN and the friction force will act at the lowest corner. Fir FIGURE 9-89 Problem 74.
- Why is it not possible to sit upright in a chair and rise toyour feet without first leaning forward?(2) uhai block is resting (Kg mass 10) on a rough horizontal surface for which the coefficient of friction is (u=0.30). Determine the force P applied to the *.block 3 P 0=30°If a frictional force were to be used to stop the block from moving, calculate the coefficient of friction needed to satisfy this condition.
- A 25-ft chain with a weight of 30 lb is suspended between two points at the same elevation. Knowing that the sag is 10 ft, determine (a) the distance between the supports, (b) the maximum tension in the chain.3) To strengthen his arm and chest muscles, a 6-slug athlete who is 6'6" tall is doing push-ups as shown in the figure below. His centre of mass is 3'9" from the bottom of his feet, and the centres of his palms are one foot from the top of his head. Find the force that the floor exerts on each of his feet and on each hand, assuming that both feet exert the same force and both palms do likewise. Begin with a free-body diagram of the athlete. 6'6" K–1'-