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# 3_3 - PrIJIJIBl'It 3.3-3 While remoﬁng a wheel to change...

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Unformatted text preview: PrIJIJIBl'It 3.3-3 While remoﬁng a wheel to change a tire, a driver applies forces P = 25 lb at the ends of two ofthe arms of a lug wrench {see ﬁgure}. The wrench is made of steel with shear modulus of elasticityr G = 11.4 X 105 psi. Each arm of the wrench is 9.0 in. long and has a solid circular cross section of diameter d = 0.5 in. {a} Determine the maximum shear stress in ﬂ1e arm that is turning the log out {11111151}. {b} Determine the angle of twist {in degrees} of this same arm. {a1hhmmmsﬂssksmsss P=251b F From Eq. (3—12): vIr L = 9.!) in. Q \$11 E _ _ E_ {16)(4513 lb-in.) |-—L—.+—L—..| ’1 = ‘15 "1' T“ _ mtg _ arms 111.13 11: :3 =11.4 3-: 111‘5 p51 Tm: 133001151 4— ' {b} ANGLE or: ﬁrst I) T: 1‘3qu 31211113 on armﬁ Arm A - I T T: PIN-r) = 2125 11:14:11.0 in.) From EQ- (3 15). T _ _ =“G‘Hn- ¢=E=m or,” {11.4 x 11215 psi)(3—1;}( 0.5 in.)4 s. = amass rad = 3.32“ 4— ...
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