Determine the moment M which the motor must exert in order to position the uniform slender bar of mass m =2.4 kg and length L= 1.2 m in the position e-23° The ratio of the radius of the gear wheel B attached to the bar to that of the gear wheel A attached to the motor shaft is 1.5. B. Answer: M= N-m
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- Determine the moment M which the motor must exert in order to position the uniform slender bar of mass m = 3.3 kg and length L= 2.0 m in the position e = 25°. The ratio of the radius of the gear wheel B attached to the bar to that of the gear wheel A attached to the motor shaft is 1.5. Answer: M = N-mPulley A delivers a steady torque of 1100 lb-in. To a pump through its shaft at C. The tension in the lower side of the belt is 165 lb. The driving motor weighs 200 lb and rotates clockwise. Determine the bearing reaction force at O. A 9" B 30° 37 8" 150 lb - 5"-- 5"-The compound pulley shown has a weight of 1600 N and the radius of gyration (k = 2 m). Find the tension in the cord supporting the 1500-N weight (TA) and tension supporting the 2000-N weight (TB) as shown
- The 78-kg ventilation door OD with mass center at G is held in the open position shown by means of a moment M applied at A to the opening linkage. Member AB is parallel to the door for the 40° position shown. Determine the magnitude of the moment M. M A -0.7 m 0.7 m Answer: Mi B 0 0.4 m 697.547 C 40° 0.4 m G 0.8 m D N-m5. The pumping unit is used to recover oil. When the walking beam ABC is horizontal, the force acting in the wireline at the well head is 250 lb. Determine the torque M which must be exerted by the motor in order to overcome this load. The horse-head C weighs 60 lb and has a center of gravity at Gc. The walking beam ABC has a weight of 130 lb and a center of gravity at Gs, and the counterweight has a weight of 200 lb and a center of gravity at Gw. The pitman, AD, is pin connected at its ends and has negligible weight. -5 ft -6 ft !GB B 70° 20° 250 Ib 3 ft 2.5 ftC6-70 The tower crane shown in Fig. construction materials. The counterweight C weighs 31,000 N; the motor M weighs 4500 N; the weight of the boom AB is 36,000 N and can be considered as acting at point G; and the weight of the tower is 23,000N and can be considered as acting at its midpoint. is used to lift It is desired that the reaction forces at the feet D and E always be greater than 4500 N to ensure that the tower is never in danger of tipping over. Plot Wmax, the max- imum load that can be lifted as a function of the dis- tance x (0The 0.6 m uniform slender bar has a mass of 5 kg. Two springs 1 and 2 having stiffness k, = 80 N/m and k₂= 45 N/m respectively are attached at end B of the slender bar. A 20 kg mass is suspended through a rope of negligible weight at the other end as shown. If a counter-clockwise moment M = 10 N. m is applied on the bar when it is at rest in the horizontal position, determine the angular velocity (₂) of the slender bar when it has rotated 30° couterclockwise. Note: Both springs always remain vertical because of the roller supports shown and are unstretched when the bar is horizontal. (Include any diagrams needed to support your solutions) 201 0 10 Km 04M A-80 N/m 45 N/m O 06mProblem Statement Based on Problem 4-59 from the textbook. The board is used to hold the end of the cross lug wrench in the position shown. If a torque of 30 N*m about x axis is required to tighten the nut, determine the required magnitude of the force F needed to turn the wrench. Force F lies in a verticla plane. = 280 mm b=235 mm -Fach Student: b Z 60° a - yNAME Question 1 (6/20) ANSWER ON THE YELLOW PAGES The nose wheel of the landing gear of an aircraft is extended and retracted by applying a torque M to the rod BC by means of an shaft located at point B. The rod AO, on which the landing wheel is also located, has a combined mass of 100 kg which may be simplified to a point force at point G. The masses of the bars CD and BC may be neglected. If the point D is located underneath point B, the rod CD is at an angle of 30° to the vertical y-axis. At this position the landing gear should be kept stationary, dynamic effects may therefore be neglected. All components are made out of stainless steel with max=200 MPa and Imax = 75 MPa. ALO d. 800 mm 400 mm 200 mm B 300 D M 500 mm OC 500 mm A D Questions, also draw all relevant free-body diagrams: a. Calculate the magnitude of the reaction force at point A. b. Calculate the minimum diameter of the pin in point A. The connection in point A is realized as shown on the right figure. Use a safety…The system below is composed of a uniform, slender rod. The mass of each section can be described using its density, p =2.2 kg/m. The distances on the diagram below are: a = 190 mm, b= 310 mm, and c= 430 mm. Determine the magnitudes of the force and moment reactions at the built-in support O. (Hint: Recall the support reactions required for a built-in support. The mass of each section varies according to its length.) b 3 26 3 3aElements of the lower arm are shown in the figure. The weight of the forearm is 5 Ib with mass center at G if the T= 0 N . Determine the combined moment about the elbow pivot (o) of the weights of the fore arm and the sphere, from the following answers which of them is correct: 5 Ib Ib M= 134 lb.in M= 144 Ib.in M= 0 Ib.in M= 107.441 Ib.in M= 128.6 Ib.inThe tractor shovel shown ,carries a 530 kg load that has its center of mass at HH. The shovel’s dimensions are: a = 51.0 mm, b = 204 mm, c = 306 mm, d = 102 mm, and e = 357 mm. Find the reaction force at E(Ex and Ey). Assume that the positive direction of the x and y axes is to the right and upward, respectively.SEE MORE QUESTIONS