Exam1_Fall07

# Vector Mechanics for Engineers: Statics w/CD-ROM

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Phys 295:Exam I Name: Each problern is worth 20 points. Show all of your work and assumptions. 1. Determine the forces in AB and BC (Units: lbs, in) 3 October 2007 6* '"'*l " G?,qo z 5 3 , 1 o o ( : . < : 9 = B ; {c^"^-'ffi) 3 G , 1 " fo^-'(#) )t ,l'" ne-\u.od T S'',^ (Ge,q') Fu" \a*: o{ cos''r'€ s Fou'= to# + F-: * 2( Soo)Fe* c0\$ (6a,1') W l,o.d oQ s'rnf, ! K= 1O'- I F = 1o'-* \$i^ (6e,s") ,3 ffi#* s 0 0 -T-_- s ,j,^ fr. I F{e_\1 n- _tE < - l L \ - Fog Cos I - Fe. eoS 6( F+B cos zb.b"-Fer Cos 3a\$ o 9 Te. : I'tz F^U FB c Si r.., 3G,1 ' 1 r - I f*s : q,lI't* | Fe. -n 5oo tbg 5oo _ F6g s'^ 26.u" = BCO - \-np, Sinzto.Uo - O = tTn= O = Fg. = I,rz ( \$q+ rk) ( t , ta P^*) si n36,"r o

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3 October 2007 Phys 295:Exam I 2. A 300 lbs.is applied to point A on the edge of the wide flange beam. Calculate the x, y, andz components of the moment at B due to this force. (Units: lb1, in) A (36,7?.S) X I Z U \ = a L 2 - - Q F.r= (:oo ruq):;", ,o": t:?ln"i Fn = (3Oo tr"a) c or 3oo = zLo \t\$ F* = Fq sin soo : hto ttq) :i^ E6 o : \\l,\tq e : - lltt[g F+ = f, qo* 5oo 3 (r*tUo) cos foo : l6q-lt"+ t z = (+2" ) (lG? rb) - Y\\$oJ ;1 b.'X- r1\\r\$) = h,{r t'.il I .)(-rr.'!r. :t) r) (+ (u /-r \ ' L ' o ' - ( = ,1) - {"}) - 'rto)' Xrt ,)fr ;6)[' lb f l r J ' t_ +zJ Leo r pc ' 1 r- l{.
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