(4) Determine the forces in members BC and CD of the loaded truss. Ans: BC= 22.4 kN T, CD = 42.4 kN C A 4.5 m B C 16.8 kN 4.5 m 9 kN 2.8 m

4. Determine the resultant of the forces: F, = 440 N [N29°E] and F, = 275 N [S23°E]. Answer:

(4) A vertical 480 N force is applied as shown on the three-bar frame that is supported at pin A and roller B. Determine the magnitudes of the connection forces at pin C and pin E. Ans: C 824 N, E = 561 N 160 mm B 480 N 60 mm D 80 mm E -150 mm- 60 mm 100 mm

(3) The 8000 lb steel tank is lifted by a pair of tongs as shown. Determine the magnitude of the pin force at C and the magnitude and the force at the tip E of the tong BCE. Ans: C=4650 lb, E = 6140 lb 4000 lb 14 in. 4000 lb 45 in. A B 35 in. 55 in. 8000 lb -55 in.-

If an ant is moving around a few food particles of different shapes scattered on the floor, in the below shapes, Direction (Q.64 to Q.66) : Read the passage and answer the following questions. then -2.8cm- 2.8cm B В (1) (2) 1.5 cm 1.5 cm (3) 2 cm 2 cm E 2.8 сm 2.8 cm· How much distance the ant has to cover the first figure (1) 5.2 m (2) 7.2 cm (3) 6 сm (4) 5.4 cm How much distance the ant has to cover in the second figure? (1) 10.2 cm (2) 9.2 cm (3) 10.4 cm (4) 10.6 cm How much distance the ant has to cover the third figure. (1) 6.82 cm (2) 7.8 cm (3) 8.4 cm (4) 9.2 cm

If a force of 60 lb. acts at an angle of 40 to the horizontal, what is its vertical component? 39 lb. 46 lb. 20 lb.

(5) Determine the force in members AD and BD of the loaded truss. Ans: AD=4170 T, BD = 3590 N C 5m D 6m A 45° B 6m 5m 5000 N

(1) A square foundation mat supports the four columns and each column carries a vertical load shown. Determine the location on the mat of the point of application of the single resultant force of the four loads. Ans: x = 3.5 ft, z=3 ft 20 kips 40 kips 6 ft B 8 kips 12 kips 5 ft

A precast concrete wall is temporarily kept in its vertical position by ropes (see figure). Find the total force exerted on the pin at position A. The tensions in AB and AC are 420 pounds and 650 pounds, respectively.

12 Find the resultant of two forces, one of 72 pounds and the other of 56 pounds, if they act at a point at an angle of 37. 43 lb. 121 lb. 108 lb.