4-166. The snorkel boom lift is extended into the position shown. If the worker weighs 160 lb, determine the moment of this force about the connection at A. 2'ft 25 ft 50° Prob. 4-166
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- Anil4-7. Determine the moment of each of the three forces about point A. F= 250 N 30 F= 300 N 60° 4 m F=500 N Probs. 4-7/8A uniform rod AB of weight 500 N and length 4.0 m is supported at two points P and Q as shown below. AP = QB = 0.80 m. A man of weight 800 N is walking from Q to B. Find the maximum %3D %3D distance x from Q the man can walk before the rod topples about Q. P Q A 1 -| × |- O 0.4 m O 0.8 m O 0.75 m O 0.6 m
- 3. The bridge shown consists of two end sections, each weighing 20 tons with center of gravity at G, hinged to a uniform center span weighing 12 tons. Compute the reactions at A, B, E, and F. 6 tons 40m– -20m 40m 30m20m20m→- -60m 20m-20m-30m-30 kg 20k3 3, where is center of gravity? hese Is enter 2mg I e n 0 g er e CO Mk nd he ute the sa or a nd? *13-44. If the motor draws in the cable with an acceleration of 3 m/s², determine the reactions at the supports A and B. The beam has a uniform mass of 30 kg/m, and the crate has a mass of 200 kg. Neglect the mass of the motor and pulleys. 2.5 m 3 m/s² 0.5 m 3 m Prob. 13-44 B
- A force F of magnitude 56 N is applied to the gear. Determine the moment (positive if counterclockwise, negative if clockwise) of F about point O. Assumer-195 mm, 0 = 32° Answer: Mo= i N-mA 12.0 m long uniform beam with a total weight of 840 N is clamped horizontally to the top of a wall with 4.0 m projecting over one side and 8.0 m projecting over the other side (see Fig. 6-33). Determine the total moment of force exerted by the beam at the wall.Body U with mass 5m is stacked on the top body W withmass m, and released. The bodies are in contact along thefrictionless interface at 45 to the vertical. The body U isin contact with the frictionless vertical wall. Body W lieson the floor with coefficient of friction u. Relevantdimensions are shown in the figure. Express the results interms of given quantities: m, g, h and u. Body U must stay in contact with the wall. Using the equations of motion for the two bodies compute the accelerations during the motion while in contact.