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- A small lab scale has a rigid L-shaped frame ABC consisting of a horizontal aim AB (length b = 30 cm) and a vertical arm BC (length c = 20 cm) pivoted at point B. The pivot is attached to the outer frame BCD that stands on a laboratory bench. The position of the pointer at C is controlled by two parallel springs, each having a spring constant k = 3650 N/m. that are attached to a threaded rod. The pitch of the threads is p = 1.5 mm. If the weight is 65 N. how many revolutions of the nut are required to bring the pointer back to the mark?A bumper for a mine car is constructed with a spring of stiffness k = 1120 lb/in. (see figure). If a car weighing 3450 lb is traveling at velocity v = 7 mph when it strikes the spring, what is the maximum shortening of the spring?Repeat Problem 2.5-9 for the flat bar shown in the figure but assume that and that
- Repeat Problem 6.4-14 but use the configuration of channel shapes and loading shown in the figure. Use P = 250 N.5.2 In a compound helical spring, the inner spring is concentric with the outer spring, but is 9 mm shorter. The outer spring has ten coils of mean diameter 24 mm, and the wire diameter is 3 mm. Find the stiffness of the inner spring if an axial load of 150 N causes the outer spring to compress 18 mm. If the mean coil diameter for the inner spring is 15.94 mm, find the wire diameter of the inner spring when it has eight coils. Both the springs are made of the same material having G = 77 GPa.A wagon weighing 5100 Kg moving at a speed of 8 km/h has to be brought to rest. Springs made of wire diameter 25mm with a Dm of 250mm and with 24 turns are available. Find the number of springs required in buffer to stop the wagon at a compression of 180mm. b)A close coiled helical spring is made of diameter wire 25mm. The spring index is 8. Findthe number of turns required and maximum allowable load if the allowable shear stress is100 MPa and elongation is limited to 40mm. [G=80 GPa
- The deflection of the composite spring when subjected to the greatest loadA fixed bar is pinned at one end and supported by two close helical springs from identical material as shown in Figure Q6. Each spring consists of 20 number of turns of steel wire diameter of 10 mm and mean coiled diameter of 150 mm. Calculate the maximum shearing stress in the springs. Neglect the mass of the fixed bar.A fixed bar pinned at one end and supported by two close helical springs from identical material as shown in Figure Q5. Each spring consists of 20 number of turns of steel wire diameter of 10 mm and mean coiled diameter of 150 mm. Calculate the maximum shearing stress in the springs. Neglect the mass of the fixed barShown in the figure below is a parallel spring. If the allowable deformation is 25mm determine the value of P and the spring constant equivalent
- Suppose that the assembled stiffness matrix of question 1 (as shown below) is as follows: [K]=108×a-a0-aa+b-b0-bb where a=4.06 N/m and b=2.28 N/m. If the applied force at node 3 is P=210 KN, find the displacement of node 2 in mm?A HELICAL SPRING HAS A STIFFNESS OF 25 kN/m. IF A MASS OF 100kg IS ATTACHED TO ITS FREE END, PULLED DOWN, AND THENRELEASED, Req: (draw the figure first before solving the problem)A. FIND THE AMOUNT OF DEFLECTION, IN CM,B. DETERMINE THE PERIODIC TIME OF ITS MOTION,C. IF THE MAXIMUM DEFLECTION WAS 50 mm, FIND THEVELOCITY,D. FIND THE ACCELERATION OF THE MASS WHEN ITS IS 300 mmFROM THE EQUILIBRIUM POSITION.A hollow circular shaft of inner radius 20 mm, outer radius 40 mm and length 1 m is to be used as a torsional spring. If the shear modulus of the material of the shaft is 150 GPa, Calculate the torsional stiffness of the shaft (in kN-m/rad) is