A helical compression spring is needed to fit over a 0.5 in. diameter rod. To allow for some clearance, the inside diameter of the spring is to be 0.6 in. To ensure a reasonable spring size, assume a spring index of 10. The spring is to be used in a machine where it will be repeatedly compressed from a free length of 5 in. to its solid length of 2 in. and then released. The spring should have squared and ground ends and is to be made from a cold-drawn A227 wire. (a) Determine a suitable wire diameter. (b) Determine a suitable total number of coils. (c) Determine the spring rate. (d) Where is the maximum stress in the wire of the spring? (e) Determine the static factor of safety when compressed to its solid length. (f) If the spring is to be designed for infinite life, what will be the mean stress and alternating stress on the spring. (g) Calculate the weight of the spring.

At a certain instant, the particle of mass m has the position and velocity shown in the figure, and it is acted upon by the force F. Determine its angular momentum about point O and the time rate of change of this angular momentum. Use m = 2.8 kg, a = 0.58 m, b = 0.98 m, c = 0.60 m, and F = 100 N and v = 3.5 m/s. m F

Find y shown in Figure below. 3 cm 0.5 cm - 0.5 cm 1 cm A B 0.5 cm 6 cm -Xc 0.75 cm E 0.75 cm 0.75 cm- e 0.5 cm 2 cm F.

Which of these expressions represents the value of G for a 90 degree elbow if the degree of fit is 45 degree, the radius of the welding elbow is 10 inches, and the outside diameter is 14 inches. A - 45x(10+7) B - 45x(10+14) C   45x(10x7)