Q2. A railway wagon of mass m tonnes and moving with a speed of v km per hour has to be stopped by three buffer springs in which the maximum compression allowed is ò mm. The mean diameter of the coil...

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Extracted text: Q2. A railway wagon of mass m tonnes and moving with a speed of v km per hour has to be stopped by three buffer springs in which the maximum compression allowed is ò mm. The mean diameter of the coil is five times the diameter of spring wire. Permissible shear stress for the material of the spring 610 MPa and its modulus of rigidity 80 kN/mm?. Find: 1.Maximum load on each spring, 2. Diameter of spring wire, 3. The mean diameter of the spring coil. 4. Number of turns of the spring, assuming the ends of the spring to be squared and ground, 5. Free length of the spring and 6. Pitch of the coil. m V 20 6.84 210