Problem 1: During its operation, the drill shown below is jammed in the wall subjecting it to 20 N.m torque and 150 N force. The cross section of the jammed drill bit (screw), at section a-a can also been seen below. The screw (bit) is 5mm in radius and it is made from high speed steel with a yield strength of 1000 MPa. A. Determine the state of stress at point A of the cross section and represent it on a differential element B. Determine the principal stresses C. Calculate the factor of safety using the maximum shear stress (MSS) theory and the von Mises distortion energy theory (DE)

Describe the Parallel-Axis Theorem for an Area?

QUESTION 2 A shaft rotates at 300 rpm. 1). If it carries a spur gear that delivers 5 hp to a mating gear and the spur gear has the diametrical pitch of 10, pressure angle of 20°, and 80 teeth, determine a). The resultant force exerted on the shaft = Ib 2). If it carries a sprocket that delivers 4 hp to a mating sprocket and the sprocket has the pitch diameter of 6", determine b). The force exerted on the shaft Ib 3). If it carries a "flat-belt pulley" (Note: NOT V-Belt Drive) that delivers 8hp to another flat-belt pulley and the pitch diameter of the pulley is 20", determine C). The force exerted on the shaft: Ib

Q3/ Choose the correct option:-