1. Consider the forces acting on these three changes and list in order of the magnitude of the force starting with the smallest. B -------- r A ------- r --C +q +q b- -q Find FA Find FB Find Fc
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- SAQ 1 1.2 m D 80 kN m An 80-kn. m couple shown in the plate is caused by a pair of parallel forces of magnitude F (not shown). 1.6 m Determine: a) the smallest possible value of F, and b) the value of F if the forces act at points A and C and are parallel to the dashed line shown at A. А В 60°1. Consider the forces acting on these three changes and list in order of the magnitude of the force starting with the smallest. A --- r B -4 +q +q Find FA Find Fa Find Fe List in order of the magnitudeQ 3: of the forces system in the figure below . Determine the resultant moment a bout point o E. 300 N 1 m VP= 40ON Q4: For the forces system in figurel if the resultant mom ent aboul point A is equal to (Zero) find magnit ude of the force p. the A Q= 650 N 0.2 102 ml MA = 0.0 = Z Fd %3D
- A block is at rest on inclined plane and is on the verge of slipping. Which of the following relationships between W and N is correct. (Vectors not drawn to scale) F; wooden block W a. Wsin(theta)=(mu)N b. W=(mu)N O c. Wcos(theta)=(mu)N d. Wsin(theta)=NQ1) At point A, the four forces FB, Fe, Fp and Fg act, the lines of action for these forces are given by the straight lines AB, AC, AD and AE, as shown in Figure 1. Coordinate the points are: 2. A. 3 3. 9. 8. E 12 cm ст cm Figure 1 The magnitudes of the forces are: F=7 KN, F=3 KN, F 9 KN and FF 13 KN. Represent this force F acting on the point A as a Cartesian vector and determine its direction. Q2) Figure 2 shows a rope that is stretched between points A and C, there is mass m at point B. Given values: m= 20 kg, h= 2 m, d= 3 m, a= 30°, y-60°. Determine the followings: a) What are the values of lengths LAB and LBc must be selected according to the given angles a and y? b) What are the values of forces FAB and FBc in the rope sections AB and BC? A a h Figure 2 B g3. Determine the value of the force F shown, if the resultant of the five forces acting on particle O has a magnitude of 2.8 kips. What is the direction R of the resultant force? If the resultant force is to be resolved into its components along the positive x-axis and a certain v-axis, the component along the x-axis is 605 lb. What is the magnitude of the other component? Also determine the angle the v-axis makes with the y- axis? 1.4 kips 9° 141 lb 15° 46 605 lb Answers: F= 2842.7406 lb OR= 32.5094°N of E Fv= 2312.7721 lb, 49.4086° wrt y-axis 817 lb
- 4. The force F has a magnitude of 500 lb and acts along the line AM, where M is the midpoint of the vertical side OB of the parallelepiped. Express F as its magnitude times the appropriate unit vector and determine its x-, y-, and z-scalar components. B M 0 10" F-500 lb 16" 16" A12 N No trictim What force the docs bluck (2 ke block) btock ? excrt middle the on b) What exert block force docs the the 1 ke 24block on force Wat exart on decs the the 34 block the 12N 3kg trictionQUESTION 1 A force system is shown below: Which of the following most nearly gives the magnitude of the resultant of the given forces? 55 KN 3 O a. 76.85 kN O b. 121.32 kN O c. 102.67 kN O d. 81.56 kN 200 KN 30⁰ 30 kN 40⁰ 20⁰ 100 kN u QUESTION 2 Which of the following most nearly gives the component of the resultant along the u-axis? O a. 47.63 kN O b.74.48 kN O c. 79.04 kN O d.99.50 kN
- moodle.nct.eduom/mod/qi -Learning Portal Courses - Reports - e-Services- Academic Departments - ETC - CIMS - A 17kg crate resting on a horizontal surface is pushed as shown. If the coefficient of static friction u, between the surfaces is 0.24, what is the minimum force (F) required to start the motion? O a 4.08N O b. 70.83N Oc 39.98N Od. 694.17N Windows buut An object of mass Skg is sliding with a constant velocity of 10m/s on a frcitionless horizontal table. The force needed to keep the object moving with the same velocity is. 144 4- # 4. 6. V.Determine vertical reaction at the support A if forces magnitudes are F₁ = 84.6 N. F₂ = 208N: AB=1m. BC = 3 m, CD = 2m. AKXI А 450600 B C 85. Determine the force exerted by the cable at B and the reaction at support A for the bar shown. You may assume the bar is massless for the analysis. Write your answers using 3 significant digits. y A 900 N Cable B 22° C 40° 300 mm 250 mm