* Question 16 Jennifer watched as movers used a ramp to load a heavy dresser into a moving truck. The dresser, that had to be lifted 1.5 m from the street to the back of the moving truck, was pushed along a 6.6 m ramp. What is the mechanical advantage of the ramp? A 2.98

F2 F2 Fig. Q1.a. Complete 3D view Fig. Q1.b. Front view Fig. Q1.c. Cross section Point P is on the inclined plane (i.e., shaded plane) and on the front surface of the beam, which is subjected to external force F: (Fig. Q1.a.). The shaded plane is inclined by angle e with respect to negative Z axis (Fig. Q1.b.). The point P is in-plane stress state – stresses in X axis are zero - since point P is on the beam surface. At the point P, a normal vector of the cross-section, of which angle with Z axis is zero, is in parallel with Z axis. The cross-section dimension is shown in Fig. Q1.c. Assumption: Disregard Poisson's effect. Given: F = 50 N; h = 220 mm; w = 900 mm 1. Draw a 2D Mohr's circle (M.C.) – present explicitly radius, center, and principal stresses in the M.C. - by considering only stress components in Y-Z space at point P in Fig. Q1.b. - 2. For a case when 0 is 35°, please calculate a normal stress and a shear stress, which occur on the shaded plane, at point P. Also, draw the…

1. A circular opening 4 ft. in diameter is closed by a hemispherical shell weighing 2,800 lb. A. Neglecting friction, what force is required to lift the shell? B. What force is the shell held against the seat (opening wall)? 4 st. shell .

A 12° A riveter, as shown in Fig. 7.42, is operated by a piston Facting through the links EB, AB and BC. The ram D carries the tool. The piston moves in a line perpen- dicular to the line of motion of D. The length of link BC is twice the length of link AB. In the position shown, AB makes an angle of 12° with AC and BE is at right angle to A C. Find the velocity ratio of E to D. E If, in the same position, the total load on the piston is 2.2 kN, find the thrust exerted by D when the efficiency of the mechanism is 72 per cent, F Fig. 7.42 Ans. [3.2 ; 5 kN]