By James G Knudsen

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**Example text**

Finding total work done. 5 kJ (d) Finding average power developed by driving motor. 5 ϫ 103 ϭ t2 50 Average power ؍210 W ? 8 1. What is the deﬁnition of a radian? 2. How do you convert revolutions to radians? 3. How do you convert rotational speed in revolutions per minute (rpm) to angular velocity in radians per second (rad sϪ1)? 4. How do you calculate the average power developed during a period of angular acceleration? 5. How do you calculate the power being developed at a given instant during a period of angular acceleration?

The direct stress in the material is the load carried by each square millimetre or square metre of cross-sectional area. 34 the load and the stress are tensile and these are sometimes given a positive sign. Compressive loads produce compressive stress and these are sometimes given a negative sign. You will recall from the work you did in the core unit Mechanical Principles and Applications that the approved SI unit of stress is the Pascal although you will often ﬁnd its value quoted in N mϪ2 and Nm mϪ2.

Finding allowable shear stress in rivets. e. 0 mm rivets ? 7 1. 2. 3. 4. 5. What is the difference between direct loading and shear loading? Deﬁne shear stress and shear strain. What is the angle of shear? Deﬁne shear modulus. Compare the load carrying capacity for rivets of a given diameter when subjected to single shear and double shear. 6 Two steel plates are riveted together by means of a lap joint. Ten rivets of diameter 9 mm are used and the load carried is 20 kN. What is the shear stress in the rivet material and the factor of safety in operation if the shear strength is 300 MPa?