MET211_W4_Quiz_Garrett_Douglas

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ECPI University, Virginia Beach *

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211

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Mechanical Engineering

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Oct 30, 2023

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Do"f born* MET211 Quiz 4 Time;30 minutes Full mark: 100 points Problem 1. Determine the magnitude and location of the resultant of the force systems shown :i k;l,J v 3 1 krJ t-. ji r11 I l,r t'J I rtt .-r lll 1 S rtt 1 rt"t Solution: F -z1l : *Ll 4x = hX') -('(i {Xt) -r1 4z' u lf'-) s) 4 7={m f {ku
tlrA*U Problem 2. A horizontal force of 100 N is required to start a 40-kg block sliding along a horizontal sur- face. What is the coefficient of static friction? , U \, Solution: N , rf g: L{oky(O,yl N = 3t).4 U { ;3tl a(a,r) ,09 4- r, L-. - It' td0 *] 'i F= )5/U { ), ") v : o.33 4 lu \p 4lfl'l Problem 3. Determine the mass of a block if a force of 25 N is required to start it sliding on a horizontal surface (p: 0.33). ,*,n( Solution 0 G G U-tl4tr=O N'-- *T f'Fs=O f '-Yt Ft=)-tN ;rN = p(* t: r) Jt {( YV; ,33 ( Xq v) r( lr = 0.I5^ry w) = 7'lZl K6
%"r-#- Problem 4. Determine the mass m IhaI can be lifted by a rope with three-Au$ of a turn around a fixed horizontal shaft (p: 0.3) if a force of 15 kN is applied to its other end. p=0'3 T, r"5 kN fl. l\oCI 2 N/ n,cy L l; , r(a)(,r) e Solc -_ Ll )ll / n,{ lto dj LJ rrl {Ht ) (q'rtt n4 : 37 1"1*f kV
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