The 20kg box illustrated in the diagram is transported on a platform which is attached to two identical, parallel arms. The arms rotate in the indicated direction at the given constant rate. Assuming that the box does not slide relative to the platform,find the static friction coefficient over the contact surface between the box and the platform. Use the scalar method to solve this problem

Question 4: A machine of 540 kg is bolted at the middle of two parallel simply supported steel beams. The clear span of the beam is 2.4 m. The moment of inertia of the cross-section of each beam is I = 4.2×10¯6 mª. The Young's modulus of the steel is E 200 GPa. When the machine is operating, it will generate a vertical force P(t)=Posinot. When the machine runs at 300 rpm, Po= 1500 N. Neglect the weight of the beams and assume 2% viscous damping in the system. Determine the amplitude of steady-state deflection of the beams at their midpoint when the machine runs at 300 rpm. machine 1.2 m = 1.2 m Steel beams

A rod AB is resting on two surfaces with one end at surface A and another at surface B. The surface A is a rough surface with a coefficient of friction of 0.8. Calculate the value of force P required to cause motion in the rod. The length of rod is 2 m and mass is 5 kg.

A steel wire is bent into an arc of a circle of radius 5m. Find the maximum bending tensile stress induced in the wire. The diameter of the wire is 40 mm. Take E = 2 × 106 kg/cm².