ENGG 202 Lecture Notes - Lecture 1: Length Overall

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W2 and the reaction at the pin support a. Determine w2 and the reaction at the pin support a. Ans: w2 = 2546n, ax = 2085n , ay = 2510n . Solution strategy: draw fbd of the bar ab (don"t" forget to include the weight of the bar). There are two unknown reaction forces at point a. There is one unknown cable tension at b (equal to w2). The force w1 is also applied at point b. write the eqns of equil and solve for the unknowns. The length of the bar always cancels out, so you do not need it: the wheel shown is supported by a pin at c and the spring at b. 1000 n/m and the spring is unstretched when = 0. Ans: a) lstretch = 1. 487 m, fspring = 287 n at 18. 0o below horizontal, (b) m=27. 1 kg, c = 273. 1i + 355. 0j (n)

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