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01 Solutions 46060 5/6/10 2:43 PM Page 7 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. 1–11. The force F = 80 lb acts on the gear tooth. Determine the resultant internal loadings on the root of the tooth, i.e., at the centroid point A of section a–a. Equations of Equilibrium: For section a–a 30 F 80 lb a + Q©F x¿ = 0; V A - 80 cos 15° = 0 V A = 77.3 lb a + ©F y¿ = 0; N A - 80 sin 15° = 0 N A = 20.7 lb Ans. Ans. 0.23 in. A 0.16 in. a +©M A = 0; -M A - 80 sin 15°(0.16) + 80 cos 15°(0.23) = 0 M A = 14.5 lb # in. Ans. a 45 *1–12. The sky hook is used to support the cable of a scaffold over the side of a building. If it consists of a smooth rod that contacts the parapet of a wall at points A, B, and C, determine the normal force, shear force, and moment on the cross section at points D and E. Support Reactions: + c ©F y = 0; N B - 18 = 0 N B = 18.0 kN d+©M C = 0; 18(0.7) - 18.0(0.2) - N A (0.1) = 0 0.2 m 0.3 m 0.2 m 0.2 m B D E A C 0.2 m 0.2 m N A = 90.0 kN 0.3 m : + ©F x = 0; N C - 90.0 = 0 N C = 90.0 kN Equations of Equilibrium: For point D 18 kN : + © F x = 0; V D - 90.0 = 0 + c © F y = 0; N D - 18 = 0 V D = 90.0 kN N D = 18.0 kN Ans. Ans. d+© M D = 0; M D + 18(0.3) - 90.0(0.3) = 0 M D = 21.6 kN # m Equations of Equilibrium: For point E : + © F x = 0; 90.0 - V E = 0 V E = 90.0 kN + c © F y = 0; N E = 0 d+© M E = 0; 90.0(0.2) - M E = 0 M E = 18.0 kN # m Ans. Ans. Ans. Ans. 7

01 Solutions 46060 5/6/10 2:43 PM Page 8 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. •1–13. The 800-lb load is being hoisted at a constant speed using the motor M, which has a weight of 90 lb. Determine the resultant internal loadings acting on the cross section through point B in the beam. The beam has a weight of 40 lb>ft and is fixed to the wall at A. A M 1.5 ft D C B 4 ft 4 ft 3 ft 3 ft 4 ft : + ©F x = 0; -N B - 0.4 = 0 N B = - 0.4 kip + c ©F y = 0; V B - 0.8 - 0.16 = 0 V B = 0.960 kip a + ©M B = 0; - M B - 0.16(2) - 0.8(4.25) + 0.4(1.5) = 0 M B = -3.12 kip # ft Ans. Ans. Ans. 0.25 ft 1–14. Determine the resultant internal loadings acting on the cross section through points C and D of the beam in Prob. 1–13. A M 1.5 ft D C B 4 ft 4 ft 3 ft 3 ft 4 ft For point C: ; + ©F x = 0; N C + 0.4 = 0; N C = - 0.4kip + c ©F y = 0; V C - 0.8 - 0.04 (7) = 0; V C = 1.08 kip a + ©M C = 0; - M C - 0.8(7.25) - 0.04(7)(3.5) + 0.4(1.5) = 0 M C = -6.18 kip # ft For point D: ; + ©F x = 0; N D = 0 + c ©F y = 0; V D - 0.09 - 0.04(14) - 0.8 = 0; V D = 1.45 kip a +©M D = 0; - M D - 0.09(4) - 0.04(14)(7) - 0.8(14.25) = 0 M D = -15.7 kip # ft Ans. Ans. Ans. Ans. Ans. Ans. 0.25 ft 8

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