A lever is attached to a shaft with a square shear key as shown. The force applied to the lever is P = 500 N. If the shear stress in the key must not exceed 82 MPa, determine the minimum dimension "a" that must be used if the key is 16 mm long. 42 mm Shear key ·C O 12.70 mm O 11.66 mm O 16.44 mm O 10.58 mm O 7.90 mm 700 mm Shear key detail

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Length and Length related Variables

Length can de defined as the measurement or extent of physical quantities or objects from one terminal to another terminal. Stone age humans used finger length, step length, and so on to measure the size or displacement of an object. Nowadays, depending on how precise the measurement requires to be and the object’s size is measured, we use measuring devices for measurements like rulers and steel tape. Most people have used a ruler or tape measure to measure a particular distance or the size of an object. For more precise measurements of tiny objects, the development of measurement tools such as the Vernier caliper, which permits us to measure dimensions within 1/1000 of an inch. In the last few decades, electronic distance measuring instruments (EDMI) have been implemented that permit us to measure distances from a few feet to many miles with reasonable accuracy.