1. Calculate the support reactions, calculate internal forces on the designated section C, and plot the internal force diagrams of the H mes shown below. 4.2 武汉理 出版 4.4回 45圈 4.6開 3m 3m 題4.7图 題4.8图
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- Dr. Alexander is holding a briefcase with straight arm. Assume weight of the briefcase FB = 35 N, weight of the forearm FFA = 10 N, weight of the upper arm FUA = 15 N, moment arm of FB = 0.45 m, moment arm of FFA = 0.30 m, moment arm of FUA = 0.11 m, and moment arm of Fm = 0.03 m. Also, FM is 35 degrees above the horizontal. Calculate (1) muscle force FM, and (2) joint reaction forces Fj,x and Fj,yThe simplest truss consists of two rods and is loaded by the block. Given: block weight Q = 9,4 kN. Angle α = 31 degrees. Find: the algebraic (positive or negative) value (in kN) of normal force N1 in the rod 1, considering that N1>0 for tension and N1<0 for compression.The simplest truss consists of two rods and is loaded by the force F. Given: F = 5,1 kN. Angle α = 69 degrees. Find: the algebraic (positive or negative) value (in kN) of normal force N1 in the rod 1, considering that N1>0 for tension and N1<0 for compression.
- nonuniform beam 4.50 m long and weighing 1.40 kNmakes an angle of 25.0° below the horizontal. It is held in position bya frictionless pivot at its upper right end and by a cable 3.00 m fartherdown the beam and perpendicular to it . The center ofgravity of the beam is 2.00 m down the beam from the pivot. Lightingequipment exerts a 5.00 kN downward force on the lower left end ofthe beam. Find the tension T in the cable and the horizontal and verticalcomponents of the force exerted on the beam by the pivot. Start bysketching a free-body diagram of the beam.Under non-uniform and slippery road conditions, two forces (u and w), shown in the figure (image 1), are performed on the truck's rear wheels, which have a limited slip rear differential. Choose the alternatives that are true: (data: u = 92lbf and w =57lbf) (obs1.0: 1''= 1 in = 25,4mm) (obs2.0: 1lbf = 4,448N) a) the force vector resulting from the two forces is -149i [lbf] b) the resultant of the two forces has an intensity equal to 149lbf c) the ordinate of the point of intersection of the line of action of the resultant of this system of forces with the y axis is 7.05in d) adopting the counterclockwise direction as positive, the total moment of the two forces in relation to point g is equal to -1050lbf.in e) the total moment vector in relation to the G point is equal to -1050i [lbf.in]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 ft
- A beam held by a hinge, take 2. The left end of a beam of mass 17.9 kg and length L is fixed to a wall by a hinge. The beam is inclined at 19.8 degrees from the horizontal; it is supported at its right end by a rope forming an angle of 30.3 kg with the horizontal.create a template for:a) the tension in the rope;b) the orientation of the hinge force, relative to the x+ axis.Find the forces (F1,F2,F3 lb) in Fig. 364. (A=27, B=64, C=44) deg, (D=4, E=3, F=4) ft, F4=5440 lb If F4 is negative, then the direction of F4 is down. A negative answer indicates that the direction is reversed. Answers can be checked by demonstrating that components balance.A turbine is connected to a generator by means of flange coupling that has a bolt circle diameter of 20 in. The generator output is 40 Hp, 3600 rpm and 90% efficiency. If there are 10 bolts, determine the force acting on each bolt in kN.
- 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.A weight of 400 N is dropped through a height of 600 mm onto a closed coil compression spring which instantaneously compresses by 200 mm under the impact. The diameter. of spring wire is 25 mn and mean diameter of coil is 200 mm. Find maximum instantaneous stress produced by impact, and number of coil in spring take G=30 kN/mm¹.A uniform ladder stands on a rough floor and rests against a frictionless wall as shown in the figure. Since the floor is rough, it exerts both a normal force N1 and a frictional force f1 on the ladder. However, since the wall is frictionless, it exerts only a normal force N2 on the ladder. The ladder has a length of L = 4.0 m, a weight of WL = 69.0 N, and rests against the wall a distance d = 3.75 m above the floor. If a person with a mass of m = 90 kg is standing on the ladder, determine the following. (a) the forces exerted on the ladder when the person is halfway up the ladder (Enter the magnitude only.) N1 = N N2 = N f1 = N (b) the forces exerted on the ladder when the person is three-fourths of the way up the ladder (Enter the magnitude only.) N1 = N N2 = N f1 = N