8 A special C-clamp shown in the figure below uses a in -10 ACME thread and a collar of in effective mean diameter. The collar is attached rigidly to the top end of the externally threaded member. For a thread and collar friction coefficient of f = f = 0.15, determine the following: a) Torque required to develop a 150 lb clamping force on the block. [12 marks] b) Efficiency of the power screw. [4 marks] c) Force required at the end of the 6 in. handle to develop the clamping force in (a). [4 marks] d) Maximum torsional shear stress in the screw body. [4 marks] e) Axial stress in the screw body. [4 marks] f) Maximum bending stress at the root of the thread. [4 marks] g) Von Mises stress at the root of the thread. [4 marks] h) Safety factor against yielding failure of the power screw root using the DE approach with a material having Syt = 29 kpsi. Is this a suitable material?. [4 marks] (Hint: assume single thread system and that the first engaged thread bears 38% of the clamping force} Block 0 -6 in.- All Dimensions are given in inches..