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R07 Code: R7100306 B. Tech I Year (R07) Supplementary Examinations, December 2012 CLASSICAL MECHANICS (Mechanical Engineering) Time: 3 hours Max. Marks: 80 Answer any FIVE questions All questions carry equal marks ***** 1 Explain: (i) Coplanar concurrent forces (iii) Couples (ii) Moment of force (iv) Resultant of force systems 2 A small ring in situated at the centre of a hexagon, and is supported by six strings drawn tight, all in the same plane and radiating from the centre of the ring and each connected to a different angular print of the hexagon. The tensions in four consecutive strings are 12 N, 34 N, 45 N and 30 N respectively. Find the tensions in the two remaining strings. 3 Figure shows the cross-section of masonary dan. Determine the distance of the centroid from the vertical face. ↑ h ↓ ←a→ ⟵b⟶ 4 State and explain the parallel axes theorem and the perpendicular axes theorem. 5 State the assumptions for forces in members of a perfect frame and also explain the method of sections for finding the forces in a cantilever then with help of an example. 6 (a) Explain in detail rectilinear and curvelinear motions. (b) Explain the analysis of rigid body in planar motion. 7 A simple pendulum consisting of a bob attached to the cord oscillates in a vertical plane with a period of 2 s. The maximum velocity of the bob is 0.6 m/sec. Assure SHM determine: (i) amplitude of the motion (ii) the max. tangential acceleration of the bob. 8 Write short notes on: (i) simple harmonic motion (ii) work - energy applications to particle motion. *****