Question

Answer the following for the truss shown below: 10 kip 10 kip 6 Slip skip R 9 12 12 3. R and F., are closest to: a. 17 kip and 0 b. 25 kip and 8 kip c. 19 kip and 8 kip d. 25 kip and 10 kip 4. Which statement is correct? a. cosp=0.447 anda = 33.7° b. a = 33.7° and cosa 0.554 c. B = 25.56' and sina=0.833 d. cosa=0.83 and B = 25.56° 5. Fed and Fig are closest to: a. 45 kip and 37.5 kip b.-25.5 kip and 17.5 kip c. 45 kip and -37.5 kip d. 37.5 kip and -25.5 kip

Answer 1

Solve the truss to find the reactions and required forces as shown in the answer. Options for Q4. are not correct. I have done calculations for angles alpha and beta and their sine and cosines, kindly refer and correct the incorrect options.

Ans. Q3. Option b

Ans. Q5. Option a
14 kip lo kip lo kip 8 ft 6) 'd 6 ft. f h 8 HP q ft & 12ft 12.ft X Ray 8 kip aft X ŠMe ce the) . Ray x 42 -10%33 -8 * 33 -14 * 21-10x9 -8x9 =0 -25 kip : - Thay Efy =o (tve). 25 -10 -8 -14-10--8 + Rey =0 -- Rey 25 kip = Joint e 25 kip d = tant (6/9) Fed = 33.69'. { 45.07 kip Fef Efy=0 cî tue). 25 + Fed sina =0. Fed (c) Efx = 0 (→ tve) -Fef Fed cosa =0. - (-45.07) cos (33.699) Fef = 37.5 teip () .. Fef

Joint f : ffd Ffg Fef=37.5 kip 8 HP Efx=0C tre) 37.5 Ffg Ffg. = 37.5 kip (T) Ery ffa -^- Efd = 8 Hp. () To ( p the) - 8 SO 26.569 da tant (619) » sina = 0.554 = 33.7° || B = tant (16/12) cas & sin ß 0.894 = 0.447 f cosa = 0.83