HW3 - *3-4. Detcrmine the magnitude and angle 9 of F so...

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Unformatted text preview: *3-4. Detcrmine the magnitude and angle 9 of F so that the particle is in cqnilihrium. : o; - 0; FstnB — 2.25 sin60° — 715 00330“: 0 tans = = 9 = 49.8° Ans F = 11.01cN Ans 3-14. The unstretched length of spring AB is 2 m‘ If the block is held in the equilibrium 'position showmdetermine the mass of the block at D. = 30(5—2) = 90N 4 0; T cos45° —90 E = 0 T = 101.82 N = 0; — W + 101.82 sin45° +90( W = 126.0 N 126.0 m = — = 1218 kg 9.81 3 5 J :0 Ans Fcosfl + 2.25 cos60° ~ 4.5 — 7.5 sin30° = 0 3-19. The cords BCA and CD can each support a maximum load of 100 lb. Determine the maximum weight of the crate that can be hoisted at constant velocity, and the angle 9 for equilibrium. + 5 —)2E : 0, 1000056 =W(—) 13 . 12 +TXI§=0; 100sm6=W(-1—3)+W 0 = 78.7° Ans W = 51.01b Ans *3-36. The sling BAC is used to lift the 100-lb load with constant velocity. Determine the force in the sling and plot its value T (ordinate) as a function of its orientation 6, where 0 S 9 S 90". +T 2p; = 0; 100 — 2T cose = 0 loan, T 50 50 T = Ans (9 cost? T 9 If; T 600‘ ...
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HW3 - *3-4. Detcrmine the magnitude and angle 9 of F so...

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