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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
In Fig. P4.3-2 a mechanic (not shown) is using an X-style lug wrench to remove an automobile wheel by exerting equal forces P downward at C and upward at D. This creates a pure torque on arm AB, which is a rod 0.5 in. in diameter and 6.0 in. in length. (See also Fig. 4.1 at the beginning of this chapter.) The total length between the forces at C and D is 2b = 15 in. (a) Because the lug nut at A is very balky, the mechanic must exert equal forces P = 40 lbs downward at C and upward at D. What is the maximum shear stress that this creates in arm AB? (b) If the lug wrench is made of steel with a shear modulus G = 11.2 × 103 ksi, what is the relative angle of twist (in degrees) in the 6.0-in.-long arm AB?


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