The basic features of a small backhoe are shown in the illustration. Member BE (complete with hydraulic cylinder CD and bucket-control links DF and DE) weighs 500 lb with mass center at
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Engineering Mechanics: Statics
- A large symmetrical drum for drying sand is operated by the geared motor drive shown. If the mass of the sand is 780 kg and an average gear-tooth force of 2.20 kN is supplied by the motor pinion A to the drum gear normal to the contacting surfaces at B, calculate the average offset T of the center of mass Gof the sand from the vertical centerline. Neglect all friction in the supporting rollers. Assume r = 140 mm, R = 680 mm, 0 = 18°. Detail of contact at B B •G Answer:T= mmarrow_forwardWrite clearly and show the complete solution.arrow_forwardDo not give answer in image and hand writingarrow_forward
- The engine in (Figure 1) weighs 850 lb and has a center of gravity at G. Determine the normal floor reactions on each wheel of the engine standarrow_forwardThe pendulum consists of a 35-lb sphere R-0.6 ft, and a 14-lb slender rod a-13 ft. Just after the cord AB is cut, Compute the tangential component of reaction of the pin O on the disk Re in pounds. (Hint: use parallel theorem for the inertial moment)arrow_forwarda.) Draw the free body diagram of the system (b) Formulate the equations necessary to solve the problem (c) Determine the expressions for the acceleration, and tensions (T1 and T2) in the pulley system shown below. Assume m1 > m2. (note: the pulley is not assumed weightless and has a moment of inertiaarrow_forward
- The swinging frame of a balancing machine is shown in figure 1. The lever ACB has a mass of 6 kg and a radius of gyration of 75 mm about its centre of gravity which is at pivot C. The lever FD is of uniform section and has a mass of 1 kg. It carries a mass of 0,75 kg at E. The mass of the connecting link at BD may be ignored. The stiffness of the compression springs at A and B is 5,6 kg/m. Determine the frequency of vibration of the system. F 50 350 300 E 100 B D Fig. 1 mf SXA Free body diagram SXB Barrow_forwardRequired information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. The double pulley shown has a mass of 15 kg and a centroidal radius of gyration of 160 mm. Cylinder A and block B are attached to cords that are wrapped on the pulleys as shown in the figure. The coefficient of kinetic friction between block Band the surface is 0.2. Consider that the system is at rest in the position shown when a constant force P= 230 N is applied to cylinder A. 150 mm 250 mm B A 30° 15 kg 5 kg 1m Determine the velocity of cylinder A as it strikes the ground. (You must provide an answer before moving on to the next part.) m/s The velocity of cylinder A as it strikes the ground isarrow_forwardThe figure shows the side view of a portable traffic signal. The upper portion of the signal with attached frame has a mass of 90 kg with mass center at G. The signal and frame are hinged at point E and rest on a vertical post at H. In operation, member DEH is positioned vertically by means of the hand-operated winch so that the lights are directed to the left. Determine the necessary input force F that will just start to rotate the signal from its horizontal position. Note that handle A is rigidly attached to gear B. The dimension (AB) ̅=200 mm.arrow_forward
- The shaft, lever, and handle are welded together and constitute a single rigid body. Their combined mass is 40 kg with mass center at G. The assembly is mounted in bearings A and B, and rotation is prevented by link CD. Determine the magnitudes of the forces exerted on the shaft by bearings A and B while the couple is applied to the handle as shown. Would these forces change if the couple were applied to the shaft AB rather than to the handle? 100 mm 400 mm 280 mm 280 mm 620 mm 225 mm 33N-m 180 mm 180 mm Answers: A = i B = Narrow_forwardThe figure is a model for member CDE of the frame described in Prob. 4.10. Draw the FBD of the member, neglecting its weight. Count the unknowns.arrow_forwardThe 2000-lb weight of the trailer is distributed equally between its two wheels, one on each side of the trailer. The center of gravity is at G, and the wheels are free to rotate. Determine whether the trailer can be pushed over a 6-in. curb without tipping, and, if so, compute the required horizontal force P.arrow_forward
- International Edition---engineering Mechanics: St...Mechanical EngineeringISBN:9781305501607Author:Andrew Pytel And Jaan KiusalaasPublisher:CENGAGE L