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ENGG 1210 (2)
Midterm

midterm_review_solutions.pdf

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Department
Engineering
Course
ENGG 1210
Professor
Victoria Taylor
Semester
Winter

Description
Engineering Mechanics ENGG*1210,Winter2013 MidtermReview Assigned: Tuesday, February ,  -. e connected bar BC is used to increase the lever arm of the crescent wrench as shown. If a clockwise moment of A = N ▯ m is needed to tighten the nut at A and the extension is d = mm, determine the required force F in order to develop this moment.  Midterm Review  -. e chain AB exerts a force of lb on the door at B. Determine the magnitude of the moment of this force along the hinged axis x of the door. Midterm Review  -. A boy stands out at the end of the diving board, which is supported by two springs A and B, each having a stiffness of k = kN/m. In the position shown, the board is horizontal. If the boy has a mass of kg, determine the angle of tilt which the board makes with the horizontal aer he jumps off. Neglect the weight of the board and assume it is rigid. Midterm Review  -. Due to an unequal distribution of fuel in the wing tanks, the centres of gravity for the airplane fuselage A and wings B and C are located as shown. If these components have weights W = lb, W = lb, and W = lb, determine the normal reactions of A B C the wheels D, E, and F on the ground. 4–29. The connected bar BC is used to increase the lever arm of C the cre scent wrench a s shown. If a clockwi se moment of M A = 120 N m is needed to ti ghten the nut at A and the extension d = 300 mm, determine the required forF in d 15⬚ F order to develop this moment. 30⬚ 300 mm B SOLUTION A By resolving force F into components parallel and perpendicular to the box wrench BC,Fi g. a, the moment of F can be obtained by addin g algebraically the moments of the se two component s about poinA in accordance with the principle of moments. a +(M R A =© Fd; -120 = Fsin15°(0.3sin30°) - Fcos15°(0.3cos30° + 0.3) F = 239 N Ans. 4–50. The chain AB exerts a force of 20 lb on the door at B. z Determine the magnitude of the moment of this force along the hinged axis x of the door. 3ft 2ft A F =20lb SOLUTION O B y Position Vector and Force Vector: 4ft r
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