*3-8. The cords ABC and BD can each support a maximum load of 100 lb. Determine the maximum weight of the crate, and the angle 0 for equilibrium.
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- Determine the tension force F required to stabilize the 500 lb tension so that the resultant force acts vertically down the supporting column. (Scale: 1” = 250 lb) FGiven = 500 lb, θ = 45° from the x-axis F, α = 30° from the y-axisTwo identical strings making an angle of ? = 31.3° with respect to the vertical support a block of mass m = 17.2 kg. What is the tension in each of the strings?Can an object be in equilibrium when only one force acts on it? Explain.
- (II) Two cords support a chandelier in the manner shownin Fig. 9–4 except that the upper cord makes an angle of45° with the ceiling. If the cords can sustain a force of1660 N without breaking, what is the maximum chandelierweight that can be supported?Suppose the magnitude of tension force #1 is 25 N and is oriented at 265 degrees. Next, suppose the magnitude of force #2 is 5 N and oriented at 195 degrees. What is the angle correspoding to the direction with which the equilibrium force is oriented?A persons head is bent over her book. The head weighs P=37.2 N and is supported by the muscle force F m exerted by the neck extensor muscles and by the contact force F c exerted at the atlantooccipital joint. Given that the magnitude of F m is 60.0 N and is directed 35.0 degree below the horizontal. Find the magnitude of the contact force F c.
- A vertical column supports a body having a mass of6 Mg (or 6 tonnes). Calculate the approximate valueof the upward force in kN exerted by the column.During most of the stance phase of the gait, the knee flexion is less than 20º. What force must the quadriceps muscle apply to maintain this flexion while standing on one leg? The patient's weight is 836N, assuming that the distance from the center of the joint to the line of gravity is 5 cm and the distance perpendicular to the center of the joint towards which the muscle acts is 5 cm, and the muscle acts ( pull) at 60º to the horizontal.Determine the tension in the cable supporting the given load.
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